[PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 drivers/mfd/Kconfig                                |  12 +++
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 113 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++++++
 6 files changed, 183 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..5fb0b4f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,24 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2C {
+		compatible = "skyworks,sky81452";
+
+		backlight {
+			...
+		};
+
+		regulator {
+			...
+		};
+	};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index d415b38..ce76e10 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -122,6 +122,7 @@ silabs	Silicon Laboratories
 simtek
 sii	Seiko Instruments, Inc.
 sirf	SiRF Technology, Inc.
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 spansion	Spansion Inc.
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..acfb2e5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -626,6 +626,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C=y
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f001487..191c656 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
 obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
+obj-$(CONFIG_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..566912f
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,113 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_register_devices(struct device *dev,
+		const struct sky81452_platform_data *pdata)
+{
+	struct mfd_cell cells[] = {
+		{
+			.name = "sky81452-bl",
+			.platform_data = pdata->bl_pdata,
+			.pdata_size = sizeof(*pdata->bl_pdata),
+		},
+		{
+			.name = "sky81452-regulator",
+			.platform_data = pdata->regulator_init_data,
+			.pdata_size = sizeof(*pdata->regulator_init_data),
+		},
+	};
+
+	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
+			NULL, 0, NULL);
+}
+
+static int sky81452_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct regmap *map;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	map = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	i2c_set_clientdata(client, map);
+
+	return sky81452_register_devices(dev, pdata);
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..8d8ed35
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include "linux/sky81452-backlight.h"
+#include "linux/regulator/machine.h"
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

Hello,

Can somebody please review if the code has anything to improve?

Thanks. 

On Fri, Aug 08, 2014 at 06:08:19PM +0900, Gyungoh Yoo wrote:
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
>  Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  drivers/mfd/Kconfig                                |  12 +++
>  drivers/mfd/Makefile                               |   1 +
>  drivers/mfd/sky81452.c                             | 113 +++++++++++++++++++++
>  include/linux/mfd/sky81452.h                       |  32 ++++++
>  6 files changed, 183 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h
> 
> diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
> new file mode 100644
> index 0000000..5fb0b4f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> @@ -0,0 +1,24 @@
> +SKY81452 bindings
> +
> +Required properties:
> +- compatible	: Must be "skyworks,sky81452"
> +
> +Required child nodes:
> +- backlight	: container node for backlight following the binding
> +		in video/backlight/sky81452-backlight.txt
> +- regulator	: container node for regulators following the binding
> +		in regulator/sky81452-regulator.txt
> +
> +Example:
> +
> +	sky81452@2C {
> +		compatible = "skyworks,sky81452";
> +
> +		backlight {
> +			...
> +		};
> +
> +		regulator {
> +			...
> +		};
> +	};
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index d415b38..ce76e10 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -122,6 +122,7 @@ silabs	Silicon Laboratories
>  simtek
>  sii	Seiko Instruments, Inc.
>  sirf	SiRF Technology, Inc.
> +skyworks	Skyworks Solutions, Inc.
>  smsc	Standard Microsystems Corporation
>  snps 	Synopsys, Inc.
>  spansion	Spansion Inc.
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..acfb2e5 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C=y
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..191c656 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..566912f
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,113 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_register_devices(struct device *dev,
> +		const struct sky81452_platform_data *pdata)
> +{
> +	struct mfd_cell cells[] = {
> +		{
> +			.name = "sky81452-bl",
> +			.platform_data = pdata->bl_pdata,
> +			.pdata_size = sizeof(*pdata->bl_pdata),
> +		},
> +		{
> +			.name = "sky81452-regulator",
> +			.platform_data = pdata->regulator_init_data,
> +			.pdata_size = sizeof(*pdata->regulator_init_data),
> +		},
> +	};
> +
> +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> +			NULL, 0, NULL);
> +}
> +
> +static int sky81452_probe(struct i2c_client *client,
> +		const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct regmap *map;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	map = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(map))
> +		return PTR_ERR(map);
> +
> +	i2c_set_clientdata(client, map);
> +
> +	return sky81452_register_devices(dev, pdata);
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1.0");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..8d8ed35
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 backlight driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include "linux/sky81452-backlight.h"
> +#include "linux/regulator/machine.h"
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif
> -- 
> 1.9.1
> 

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

On Tue, 12 Aug 2014, GyungOh Yoo wrote:
> Can somebody please review if the code has anything to improve?

- Please don't top post - if you have a comment about the code, make
your comment below the line(s) you are referring to and cut out all
surplus quotes, replacing with "[...]".

- This driver was sent on Friday 4 days (1.5 working days) ago -
please leave at least 2 weeks before 're-sending' your patches - don't
poke.

- The merge window is currently open - maintainers are usually busy
sending pull-requests to Linus or taking a few days to have a breather
after the previous cycle - things will ramp up again in a week or so.

Someone will get round to reviewing your driver in due time.  Please
be patient.

> On Fri, Aug 8, 2014 at 6:08 PM, Gyungoh Yoo <gyungoh@gmail.com> wrote:
> 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> >  Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++
> >  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
> >  drivers/mfd/Kconfig                                |  12 +++
> >  drivers/mfd/Makefile                               |   1 +
> >  drivers/mfd/sky81452.c                             | 113
> > +++++++++++++++++++++
> >  include/linux/mfd/sky81452.h                       |  32 ++++++
> >  6 files changed, 183 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt
> > b/Documentation/devicetree/bindings/mfd/sky81452.txt
> > new file mode 100644
> > index 0000000..5fb0b4f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> > @@ -0,0 +1,24 @@
> > +SKY81452 bindings
> > +
> > +Required properties:
> > +- compatible   : Must be "skyworks,sky81452"
> > +
> > +Required child nodes:
> > +- backlight    : container node for backlight following the binding
> > +               in video/backlight/sky81452-backlight.txt
> > +- regulator    : container node for regulators following the binding
> > +               in regulator/sky81452-regulator.txt
> > +
> > +Example:
> > +
> > +       sky81452@2C {
> > +               compatible = "skyworks,sky81452";
> > +
> > +               backlight {
> > +                       ...
> > +               };
> > +
> > +               regulator {
> > +                       ...
> > +               };
> > +       };
> > diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt
> > b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > index d415b38..ce76e10 100644
> > --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> > +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > @@ -122,6 +122,7 @@ silabs      Silicon Laboratories
> >  simtek
> >  sii    Seiko Instruments, Inc.
> >  sirf   SiRF Technology, Inc.
> > +skyworks       Skyworks Solutions, Inc.
> >  smsc   Standard Microsystems Corporation
> >  snps   Synopsys, Inc.
> >  spansion       Spansion Inc.
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index de5abf2..acfb2e5 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
> >          lines on the SM501. The platform data is used to supply the
> >          base number for the first GPIO line to register.
> >
> > +config SKY81452
> > +       tristate "Skyworks Solutions SKY81452"
> > +       select MFD_CORE
> > +       select REGMAP_I2C
> > +       depends on I2C=y
> > +       help
> > +         This is the core driver for the Skyworks SKY81452 backlight and
> > +         voltage regulator device.
> > +
> > +         This driver can also be built as a module.  If so, the module
> > +         will be called sky81452.
> > +
> >  config MFD_SMSC
> >         bool "SMSC ECE1099 series chips"
> >         depends on I2C=y
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index f001487..191c656 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)    += as3711.o
> >  obj-$(CONFIG_MFD_AS3722)       += as3722.o
> >  obj-$(CONFIG_MFD_STW481X)      += stw481x.o
> >  obj-$(CONFIG_MFD_IPAQ_MICRO)   += ipaq-micro.o
> > +obj-$(CONFIG_SKY81452)         += sky81452.o
> >
> >  intel-soc-pmic-objs            := intel_soc_pmic_core.o
> > intel_soc_pmic_crc.o
> >  obj-$(CONFIG_INTEL_SOC_PMIC)   += intel-soc-pmic.o
> > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> > new file mode 100644
> > index 0000000..566912f
> > --- /dev/null
> > +++ b/drivers/mfd/sky81452.c
> > @@ -0,0 +1,113 @@
> > +/*
> > + * sky81452.c  SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/err.h>
> > +#include <linux/slab.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/mfd/sky81452.h>
> > +
> > +static const struct regmap_config sky81452_config = {
> > +       .reg_bits = 8,
> > +       .val_bits = 8,
> > +};
> > +
> > +static int sky81452_register_devices(struct device *dev,
> > +               const struct sky81452_platform_data *pdata)
> > +{
> > +       struct mfd_cell cells[] = {
> > +               {
> > +                       .name = "sky81452-bl",
> > +                       .platform_data = pdata->bl_pdata,
> > +                       .pdata_size = sizeof(*pdata->bl_pdata),
> > +               },
> > +               {
> > +                       .name = "sky81452-regulator",
> > +                       .platform_data = pdata->regulator_init_data,
> > +                       .pdata_size = sizeof(*pdata->regulator_init_data),
> > +               },
> > +       };
> > +
> > +       return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > +                       NULL, 0, NULL);
> > +}
> > +
> > +static int sky81452_probe(struct i2c_client *client,
> > +               const struct i2c_device_id *id)
> > +{
> > +       struct device *dev = &client->dev;
> > +       const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> > +       struct regmap *map;
> > +
> > +       if (!pdata) {
> > +               pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +               if (!pdata)
> > +                       return -ENOMEM;
> > +       }
> > +
> > +       map = devm_regmap_init_i2c(client, &sky81452_config);
> > +       if (IS_ERR(map))
> > +               return PTR_ERR(map);
> > +
> > +       i2c_set_clientdata(client, map);
> > +
> > +       return sky81452_register_devices(dev, pdata);
> > +}
> > +
> > +static int sky81452_remove(struct i2c_client *client)
> > +{
> > +       mfd_remove_devices(&client->dev);
> > +       return 0;
> > +}
> > +
> > +static const struct i2c_device_id sky81452_ids[] = {
> > +       { "sky81452", 0 },
> > +       { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +       { .compatible = "skyworks,sky81452", },
> > +       { }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> > +
> > +static struct i2c_driver sky81452_driver = {
> > +       .driver = {
> > +               .name = "sky81452",
> > +               .of_match_table = of_match_ptr(sky81452_of_match),
> > +       },
> > +       .probe = sky81452_probe,
> > +       .remove = sky81452_remove,
> > +       .id_table = sky81452_ids,
> > +};
> > +
> > +module_i2c_driver(sky81452_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL");
> > +MODULE_VERSION("1.0");
> > diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> > new file mode 100644
> > index 0000000..8d8ed35
> > --- /dev/null
> > +++ b/include/linux/mfd/sky81452.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * sky81452.h  SKY81452 backlight driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _SKY81452_H
> > +#define _SKY81452_H
> > +
> > +#include "linux/sky81452-backlight.h"
> > +#include "linux/regulator/machine.h"
> > +
> > +struct sky81452_platform_data {
> > +       struct sky81452_bl_platform_data *bl_pdata;
> > +       struct regulator_init_data *regulator_init_data;
> > +};
> > +
> > +#endif
> >
> >

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

When you send patch-sets, you should send them connected to one
another AKA threaded.  That way, when we're reviewing we can look at
the other patches in the set for reference.  See the man page for `git
send-email` for details.

<commit log>

> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
>  Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++

Binding documents should be sent separately:

See: Documentation/devicetree/bindings/submitting-patches.txt

>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +

This can go in with the documentation.

>  drivers/mfd/Kconfig                                |  12 +++
>  drivers/mfd/Makefile                               |   1 +
>  drivers/mfd/sky81452.c                             | 113 +++++++++++++++++++++
>  include/linux/mfd/sky81452.h                       |  32 ++++++
>  6 files changed, 183 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h
> 
> diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
> new file mode 100644
> index 0000000..5fb0b4f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> @@ -0,0 +1,24 @@
> +SKY81452 bindings
> +
> +Required properties:
> +- compatible	: Must be "skyworks,sky81452"
> +
> +Required child nodes:
> +- backlight	: container node for backlight following the binding
> +		in video/backlight/sky81452-backlight.txt
> +- regulator	: container node for regulators following the binding
> +		in regulator/sky81452-regulator.txt
> +
> +Example:
> +
> +	sky81452@2C {

Lower case.

> +		compatible = "skyworks,sky81452";

"reg"?

You also need to document the 'compatible' and 'reg' properties.

> +		backlight {
> +			...
> +		};
> +
> +		regulator {
> +			...
> +		};
> +	};

I think it would be helpful to place a fully populated example in
here.

> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index d415b38..ce76e10 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -122,6 +122,7 @@ silabs	Silicon Laboratories
>  simtek
>  sii	Seiko Instruments, Inc.
>  sirf	SiRF Technology, Inc.
> +skyworks	Skyworks Solutions, Inc.
>  smsc	Standard Microsystems Corporation
>  snps 	Synopsys, Inc.
>  spansion	Spansion Inc.
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..acfb2e5 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config SKY81452

MFD_SKY81452

> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C=y

Why do you need I2C to be built-in, rather than as a module?

> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..191c656 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..566912f
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,113 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_register_devices(struct device *dev,
> +		const struct sky81452_platform_data *pdata)
> +{
> +	struct mfd_cell cells[] = {
> +		{
> +			.name = "sky81452-bl",
> +			.platform_data = pdata->bl_pdata,
> +			.pdata_size = sizeof(*pdata->bl_pdata),

Have you tested this with DT?

You're not passing the compatible string and not using
of_platform_populate() so I'm struggling to see how it would work
properly.

> +		},
> +		{
> +			.name = "sky81452-regulator",
> +			.platform_data = pdata->regulator_init_data,
> +			.pdata_size = sizeof(*pdata->regulator_init_data),
> +		},
> +	};

Please declare this outside of the function?

> +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> +			NULL, 0, NULL);

This doesn't really need to be in a function of its own.  Please put
it in .probe().  Also check for the return value and present the user
with an error message if it fails.

> +}
> +
> +static int sky81452_probe(struct i2c_client *client,
> +		const struct i2c_device_id *id)

Line up against '('.

> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct regmap *map;

Can you call this 'regmap' for clarity.

> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	map = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(map))
> +		return PTR_ERR(map);

I'm not sure you want this to fail silently.

> +	i2c_set_clientdata(client, map);
> +
> +	return sky81452_register_devices(dev, pdata);
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452", 0 },

Remove the second attribute, it's unused.

> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif

You can drop the #differy the compiler should sort that out on the
back of of_match_ptr().

> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");

I think you want v2.

> +MODULE_VERSION("1.0");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..8d8ed35
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 backlight driver

If it's a just a backlight driver, why is it in MFD?

You'd best expand the description here.

> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include "linux/sky81452-backlight.h"
> +#include "linux/regulator/machine.h"

s/"/< and >

> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Thierry Reding]

[-- Attachment #1: Type: text/plain, Size: 1728 bytes --]

On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
[...]
> > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
[...]
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
[...]
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +	{ .compatible = "skyworks,sky81452", },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> 
> You can drop the #differy the compiler should sort that out on the
> back of of_match_ptr().

It won't, unfortunately. If !OF, then of_match_ptr(x) will evaluate to
NULL, therefore sky81452_of_match will become unreferenced and cause the
compiler to output a warning. I guess it could be made __maybe_unused,
but I don't see that as much of an advantage over the #ifdef.

> > +static struct i2c_driver sky81452_driver = {
> > +	.driver = {
> > +		.name = "sky81452",
> > +		.of_match_table = of_match_ptr(sky81452_of_match),
> > +	},
> > +	.probe = sky81452_probe,
> > +	.remove = sky81452_remove,
> > +	.id_table = sky81452_ids,
> > +};
> > +
> > +module_i2c_driver(sky81452_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL");
> 
> I think you want v2.

The header comment says "... version 2, or (at your option) any later
version.", so I think "GPL" is the right one here.

Thierry

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Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

On Thu, 21 Aug 2014, Thierry Reding wrote:

> On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> [...]
> > > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> [...]
> > > + * This program is free software; you can redistribute it and/or modify it
> > > + * under the terms of the GNU General Public License as published by the
> > > + * Free Software Foundation; either version 2, or (at your option) any
> > > + * later version.
> [...]
> > > +	{ }
> > > +};
> > > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > > +
> > > +#ifdef CONFIG_OF
> > > +static const struct of_device_id sky81452_of_match[] = {
> > > +	{ .compatible = "skyworks,sky81452", },
> > > +	{ }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > > +#endif
> > 
> > You can drop the #differy the compiler should sort that out on the
> > back of of_match_ptr().
> 
> It won't, unfortunately. If !OF, then of_match_ptr(x) will evaluate to
> NULL, therefore sky81452_of_match will become unreferenced and cause the
> compiler to output a warning. I guess it could be made __maybe_unused,
> but I don't see that as much of an advantage over the #ifdef.

Yes, I suppose it would.  That's sad.

> > > +static struct i2c_driver sky81452_driver = {
> > > +	.driver = {
> > > +		.name = "sky81452",
> > > +		.of_match_table = of_match_ptr(sky81452_of_match),
> > > +	},
> > > +	.probe = sky81452_probe,
> > > +	.remove = sky81452_remove,
> > > +	.id_table = sky81452_ids,
> > > +};
> > > +
> > > +module_i2c_driver(sky81452_driver);
> > > +
> > > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > > +MODULE_LICENSE("GPL");
> > 
> > I think you want v2.
> 
> The header comment says "... version 2, or (at your option) any later
> version.", so I think "GPL" is the right one here.

Fair enough.  Withdrawn.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

Thank you for reviewing the patches.

On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> When you send patch-sets, you should send them connected to one
> another AKA threaded.  That way, when we're reviewing we can look at
> the other patches in the set for reference.  See the man page for `git
> send-email` for details.
> 
> <commit log>
> 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> >  Documentation/devicetree/bindings/mfd/sky81452.txt |  24 +++++
> 
> Binding documents should be sent separately:
> 
> See: Documentation/devicetree/bindings/submitting-patches.txt
> 
> >  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
> 
> This can go in with the documentation.

I see. I will re-send them separately.

> 
> >  drivers/mfd/Kconfig                                |  12 +++
> >  drivers/mfd/Makefile                               |   1 +
> >  drivers/mfd/sky81452.c                             | 113 +++++++++++++++++++++
> >  include/linux/mfd/sky81452.h                       |  32 ++++++
> >  6 files changed, 183 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
> > new file mode 100644
> > index 0000000..5fb0b4f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> > @@ -0,0 +1,24 @@
> > +SKY81452 bindings
> > +
> > +Required properties:
> > +- compatible	: Must be "skyworks,sky81452"
> > +
> > +Required child nodes:
> > +- backlight	: container node for backlight following the binding
> > +		in video/backlight/sky81452-backlight.txt
> > +- regulator	: container node for regulators following the binding
> > +		in regulator/sky81452-regulator.txt
> > +
> > +Example:
> > +
> > +	sky81452@2C {
> 
> Lower case.
> 
> > +		compatible = "skyworks,sky81452";
> 
> "reg"?
> 
> You also need to document the 'compatible' and 'reg' properties.
> 
> > +		backlight {
> > +			...
> > +		};
> > +
> > +		regulator {
> > +			...
> > +		};
> > +	};
> 
> I think it would be helpful to place a fully populated example in
> here.

I will update it.

> 
> > diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > index d415b38..ce76e10 100644
> > --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> > +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > @@ -122,6 +122,7 @@ silabs	Silicon Laboratories
> >  simtek
> >  sii	Seiko Instruments, Inc.
> >  sirf	SiRF Technology, Inc.
> > +skyworks	Skyworks Solutions, Inc.
> >  smsc	Standard Microsystems Corporation
> >  snps 	Synopsys, Inc.
> >  spansion	Spansion Inc.
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index de5abf2..acfb2e5 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
> >  	 lines on the SM501. The platform data is used to supply the
> >  	 base number for the first GPIO line to register.
> >  
> > +config SKY81452
> 
> MFD_SKY81452
> 
> > +	tristate "Skyworks Solutions SKY81452"
> > +	select MFD_CORE
> > +	select REGMAP_I2C
> > +	depends on I2C=y
> 
> Why do you need I2C to be built-in, rather than as a module?

It will depend only on I2C.

> 
> > +	help
> > +	  This is the core driver for the Skyworks SKY81452 backlight and
> > +	  voltage regulator device.
> > +
> > +	  This driver can also be built as a module.  If so, the module
> > +	  will be called sky81452.
> > +
> >  config MFD_SMSC
> >         bool "SMSC ECE1099 series chips"
> >         depends on I2C=y
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index f001487..191c656 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
> >  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
> >  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
> >  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> > +obj-$(CONFIG_SKY81452)		+= sky81452.o
> >  
> >  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
> >  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> > new file mode 100644
> > index 0000000..566912f
> > --- /dev/null
> > +++ b/drivers/mfd/sky81452.c
> > @@ -0,0 +1,113 @@
> > +/*
> > + * sky81452.c	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/err.h>
> > +#include <linux/slab.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/mfd/sky81452.h>
> > +
> > +static const struct regmap_config sky81452_config = {
> > +	.reg_bits = 8,
> > +	.val_bits = 8,
> > +};
> > +
> > +static int sky81452_register_devices(struct device *dev,
> > +		const struct sky81452_platform_data *pdata)
> > +{
> > +	struct mfd_cell cells[] = {
> > +		{
> > +			.name = "sky81452-bl",
> > +			.platform_data = pdata->bl_pdata,
> > +			.pdata_size = sizeof(*pdata->bl_pdata),
> 
> Have you tested this with DT?
> 
> You're not passing the compatible string and not using
> of_platform_populate() so I'm struggling to see how it would work
> properly.

sky81452-bl and regulator-sky81452 is parsing the information
in regulator node of its parent node. So I thought these 2 drivers
don't need compatible attribute. That is what it didn't have
compatible string.
Is is mandatory that all drivers should have compatible attribute?

> 
> > +		},
> > +		{
> > +			.name = "sky81452-regulator",
> > +			.platform_data = pdata->regulator_init_data,
> > +			.pdata_size = sizeof(*pdata->regulator_init_data),
> > +		},
> > +	};
> 
> Please declare this outside of the function?

I see.

> 
> > +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > +			NULL, 0, NULL);
> 
> This doesn't really need to be in a function of its own.  Please put
> it in .probe().  Also check for the return value and present the user
> with an error message if it fails.

I think this need to be, in case of !CONFIG_OF.
Can you please explain more in details?

> 
> > +}
> > +
> > +static int sky81452_probe(struct i2c_client *client,
> > +		const struct i2c_device_id *id)
> 
> Line up against '('.
> 
> > +{
> > +	struct device *dev = &client->dev;
> > +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> > +	struct regmap *map;
> 
> Can you call this 'regmap' for clarity.

I see. Thank you.

> 
> > +	if (!pdata) {
> > +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +		if (!pdata)
> > +			return -ENOMEM;
> > +	}
> > +
> > +	map = devm_regmap_init_i2c(client, &sky81452_config);
> > +	if (IS_ERR(map))
> > +		return PTR_ERR(map);
> 
> I'm not sure you want this to fail silently.
> 
> > +	i2c_set_clientdata(client, map);
> > +
> > +	return sky81452_register_devices(dev, pdata);
> > +}
> > +
> > +static int sky81452_remove(struct i2c_client *client)
> > +{
> > +	mfd_remove_devices(&client->dev);
> > +	return 0;
> > +}
> > +
> > +static const struct i2c_device_id sky81452_ids[] = {
> > +	{ "sky81452", 0 },
> 
> Remove the second attribute, it's unused.
> 
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +	{ .compatible = "skyworks,sky81452", },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> 
> You can drop the #differy the compiler should sort that out on the
> back of of_match_ptr().
> 
> > +static struct i2c_driver sky81452_driver = {
> > +	.driver = {
> > +		.name = "sky81452",
> > +		.of_match_table = of_match_ptr(sky81452_of_match),
> > +	},
> > +	.probe = sky81452_probe,
> > +	.remove = sky81452_remove,
> > +	.id_table = sky81452_ids,
> > +};
> > +
> > +module_i2c_driver(sky81452_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL");
> 
> I think you want v2.
> 
> > +MODULE_VERSION("1.0");
> > diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> > new file mode 100644
> > index 0000000..8d8ed35
> > --- /dev/null
> > +++ b/include/linux/mfd/sky81452.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * sky81452.h	SKY81452 backlight driver
> 
> If it's a just a backlight driver, why is it in MFD?
> 
> You'd best expand the description here.

Sorry about that. I missed it.

> 
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _SKY81452_H
> > +#define _SKY81452_H
> > +
> > +#include "linux/sky81452-backlight.h"
> > +#include "linux/regulator/machine.h"
> 
> s/"/< and >
> 
> > +struct sky81452_platform_data {
> > +	struct sky81452_bl_platform_data *bl_pdata;
> > +	struct regulator_init_data *regulator_init_data;
> > +};
> > +
> > +#endif
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

On Mon, 25 Aug 2014, Gyungoh Yoo wrote:
> On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> > When you send patch-sets, you should send them connected to one
> > another AKA threaded.  That way, when we're reviewing we can look at
> > the other patches in the set for reference.  See the man page for `git
> > send-email` for details.
> > 
> > <commit log>
> > 
> > > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > > ---

[...]

> > > +static int sky81452_register_devices(struct device *dev,
> > > +		const struct sky81452_platform_data *pdata)
> > > +{
> > > +	struct mfd_cell cells[] = {
> > > +		{
> > > +			.name = "sky81452-bl",
> > > +			.platform_data = pdata->bl_pdata,
> > > +			.pdata_size = sizeof(*pdata->bl_pdata),
> > 
> > Have you tested this with DT?
> > 
> > You're not passing the compatible string and not using
> > of_platform_populate() so I'm struggling to see how it would work
> > properly.
> 
> sky81452-bl and regulator-sky81452 is parsing the information
> in regulator node of its parent node. So I thought these 2 drivers
> don't need compatible attribute. That is what it didn't have
> compatible string.
> Is is mandatory that all drivers should have compatible attribute?

How do they obtain their DT nodes?

[...]

> > > +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > > +			NULL, 0, NULL);
> > 
> > This doesn't really need to be in a function of its own.  Please put
> > it in .probe().  Also check for the return value and present the user
> > with an error message if it fails.
> 
> I think this need to be, in case of !CONFIG_OF.
> Can you please explain more in details?

Then how to you obtain the shared register map you created?

[...]

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

On Tue, Aug 26, 2014 at 09:22:58AM +0100, Lee Jones wrote:
> On Mon, 25 Aug 2014, Gyungoh Yoo wrote:
> > On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> > > When you send patch-sets, you should send them connected to one
> > > another AKA threaded.  That way, when we're reviewing we can look at
> > > the other patches in the set for reference.  See the man page for `git
> > > send-email` for details.
> > > 
> > > <commit log>
> > > 
> > > > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > > > ---
> 
> [...]
> 
> > > > +static int sky81452_register_devices(struct device *dev,
> > > > +		const struct sky81452_platform_data *pdata)
> > > > +{
> > > > +	struct mfd_cell cells[] = {
> > > > +		{
> > > > +			.name = "sky81452-bl",
> > > > +			.platform_data = pdata->bl_pdata,
> > > > +			.pdata_size = sizeof(*pdata->bl_pdata),
> > > 
> > > Have you tested this with DT?
> > > 
> > > You're not passing the compatible string and not using
> > > of_platform_populate() so I'm struggling to see how it would work
> > > properly.
> > 
> > sky81452-bl and regulator-sky81452 is parsing the information
> > in regulator node of its parent node. So I thought these 2 drivers
> > don't need compatible attribute. That is what it didn't have
> > compatible string.
> > Is is mandatory that all drivers should have compatible attribute?
> 
> How do they obtain their DT nodes?

The backlight driver which is one of the child driver is obtain its DT node like this

np = of_get_child_by_name(dev->parent->of_node, "backlight");

> 
> [...]
> 
> > > > +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > > > +			NULL, 0, NULL);
> > > 
> > > This doesn't really need to be in a function of its own.  Please put
> > > it in .probe().  Also check for the return value and present the user
> > > with an error message if it fails.
> > 
> > I think this need to be, in case of !CONFIG_OF.
> > Can you please explain more in details?
> 
> Then how to you obtain the shared register map you created?

regmap is stored in driver data in MFD.

i2c_set_clientdata(client, regmap);

The child drivers obain the regmap from the parent.

struct regmap *regmap = dev_get_drvdata(dev->parent);

> 
> [...]
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

On Wed, 27 Aug 2014, Gyungoh Yoo wrote:
> On Tue, Aug 26, 2014 at 09:22:58AM +0100, Lee Jones wrote:
> > On Mon, 25 Aug 2014, Gyungoh Yoo wrote:
> > > On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> > > > When you send patch-sets, you should send them connected to one
> > > > another AKA threaded.  That way, when we're reviewing we can look at
> > > > the other patches in the set for reference.  See the man page for `git
> > > > send-email` for details.
> > > > 
> > > > <commit log>
> > > > 
> > > > > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > > > > ---
> > 
> > [...]
> > 
> > > > > +static int sky81452_register_devices(struct device *dev,
> > > > > +		const struct sky81452_platform_data *pdata)
> > > > > +{
> > > > > +	struct mfd_cell cells[] = {
> > > > > +		{
> > > > > +			.name = "sky81452-bl",
> > > > > +			.platform_data = pdata->bl_pdata,
> > > > > +			.pdata_size = sizeof(*pdata->bl_pdata),
> > > > 
> > > > Have you tested this with DT?
> > > > 
> > > > You're not passing the compatible string and not using
> > > > of_platform_populate() so I'm struggling to see how it would work
> > > > properly.
> > > 
> > > sky81452-bl and regulator-sky81452 is parsing the information
> > > in regulator node of its parent node. So I thought these 2 drivers
> > > don't need compatible attribute. That is what it didn't have
> > > compatible string.
> > > Is is mandatory that all drivers should have compatible attribute?
> > 
> > How do they obtain their DT nodes?
> 
> The backlight driver which is one of the child driver is obtain its DT node like this
> 
> np = of_get_child_by_name(dev->parent->of_node, "backlight");

The MFD core provides infrastructure so you don't have to do this.

Just place the compatible string in 'struct mfd_cell cells[]' and the
core will match and populate dev->of_node for you.

> > [...]
> > 
> > > > > +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > > > > +			NULL, 0, NULL);
> > > > 
> > > > This doesn't really need to be in a function of its own.  Please put
> > > > it in .probe().  Also check for the return value and present the user
> > > > with an error message if it fails.
> > > 
> > > I think this need to be, in case of !CONFIG_OF.
> > > Can you please explain more in details?
> > 
> > Then how to you obtain the shared register map you created?
> 
> regmap is stored in driver data in MFD.
> 
> i2c_set_clientdata(client, regmap);
> 
> The child drivers obain the regmap from the parent.
> 
> struct regmap *regmap = dev_get_drvdata(dev->parent);

Ah yes, of course you do.  Silly of me to miss this.

I also just noticed that you're also manually populating the
chlidren's platform data.  It's easier if you do this from the child
device drivers:

  const struct sky81452_platform_data ppdata = dev_get_platdata(dev->parent);
  const struct sky81452_bl_platform_data = pdata = ppdata->bl_pdata;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/3] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

On Wed, Aug 27, 2014 at 09:39:21AM +0100, Lee Jones wrote:
> On Wed, 27 Aug 2014, Gyungoh Yoo wrote:
> > On Tue, Aug 26, 2014 at 09:22:58AM +0100, Lee Jones wrote:
> > > On Mon, 25 Aug 2014, Gyungoh Yoo wrote:
> > > > On Thu, Aug 21, 2014 at 10:45:02AM +0100, Lee Jones wrote:
> > > > > When you send patch-sets, you should send them connected to one
> > > > > another AKA threaded.  That way, when we're reviewing we can look at
> > > > > the other patches in the set for reference.  See the man page for `git
> > > > > send-email` for details.
> > > > > 
> > > > > <commit log>
> > > > > 
> > > > > > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > > > > > ---
> > > 
> > > [...]
> > > 
> > > > > > +static int sky81452_register_devices(struct device *dev,
> > > > > > +		const struct sky81452_platform_data *pdata)
> > > > > > +{
> > > > > > +	struct mfd_cell cells[] = {
> > > > > > +		{
> > > > > > +			.name = "sky81452-bl",
> > > > > > +			.platform_data = pdata->bl_pdata,
> > > > > > +			.pdata_size = sizeof(*pdata->bl_pdata),
> > > > > 
> > > > > Have you tested this with DT?
> > > > > 
> > > > > You're not passing the compatible string and not using
> > > > > of_platform_populate() so I'm struggling to see how it would work
> > > > > properly.
> > > > 
> > > > sky81452-bl and regulator-sky81452 is parsing the information
> > > > in regulator node of its parent node. So I thought these 2 drivers
> > > > don't need compatible attribute. That is what it didn't have
> > > > compatible string.
> > > > Is is mandatory that all drivers should have compatible attribute?
> > > 
> > > How do they obtain their DT nodes?
> > 
> > The backlight driver which is one of the child driver is obtain its DT node like this
> > 
> > np = of_get_child_by_name(dev->parent->of_node, "backlight");
> 
> The MFD core provides infrastructure so you don't have to do this.
> 
> Just place the compatible string in 'struct mfd_cell cells[]' and the
> core will match and populate dev->of_node for you.

I see. Thank you.

> 
> > > [...]
> > > 
> > > > > > +	return mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
> > > > > > +			NULL, 0, NULL);
> > > > > 
> > > > > This doesn't really need to be in a function of its own.  Please put
> > > > > it in .probe().  Also check for the return value and present the user
> > > > > with an error message if it fails.
> > > > 
> > > > I think this need to be, in case of !CONFIG_OF.
> > > > Can you please explain more in details?
> > > 
> > > Then how to you obtain the shared register map you created?
> > 
> > regmap is stored in driver data in MFD.
> > 
> > i2c_set_clientdata(client, regmap);
> > 
> > The child drivers obain the regmap from the parent.
> > 
> > struct regmap *regmap = dev_get_drvdata(dev->parent);
> 
> Ah yes, of course you do.  Silly of me to miss this.
> 
> I also just noticed that you're also manually populating the
> chlidren's platform data.  It's easier if you do this from the child
> device drivers:
> 
>   const struct sky81452_platform_data ppdata = dev_get_platdata(dev->parent);
>   const struct sky81452_bl_platform_data = pdata = ppdata->bl_pdata;

I think it could be a good way for this. Thank you.

> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

[PATCH v2 0/7] Adding Skyworks SKY81452 device drivers

[Gyungoh Yoo]

This patch set includes regulator and backlight driver for SKY81452.
Also it includes documents for device tree and module.

v2:
Split the patches for each sub-system.
Added 'reg' attribute for I2C address in device tree documents
Added 'compatible' attribute in child drivers
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.

Gyungoh Yoo (7):
  Adding Skyworks SKY81452 MFD driver
  Adding Skyworks SKY81452 regulator driver
  Adding Skyworks SKY81452 backlight driver
  Adding SKY81452 MFD device tree bindings document
  Adding SKY81452 regulator device tree bindings document
  Adding SKY81452 backlight device tree bindings document
  Adding SKY81452 backlight document

 Documentation/backlight/sky81452-backlight.txt     |  26 ++
 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt |  32 ++
 .../bindings/regulator/sky81452-regulator.txt      |  18 ++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../video/backlight/sky81452-backlight.txt         |  24 ++
 drivers/mfd/Kconfig                                |  12 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 108 +++++++
 drivers/regulator/Kconfig                          |  11 +
 drivers/regulator/Makefile                         |   1 +
 drivers/regulator/sky81452-regulator.c             | 140 +++++++++
 drivers/video/backlight/Kconfig                    |  10 +
 drivers/video/backlight/Makefile                   |   1 +
 drivers/video/backlight/sky81452-backlight.c       | 347 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++
 include/linux/sky81452-backlight.h                 |  47 +++
 17 files changed, 812 insertions(+)
 create mode 100644 Documentation/backlight/sky81452-backlight.txt
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 drivers/regulator/sky81452-regulator.c
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/mfd/sky81452.h
 create mode 100644 include/linux/sky81452-backlight.h

-- 
1.9.1

[PATCH v2 1/7] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

v2:
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.

---
 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 108 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 153 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..6962b4e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -626,6 +626,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f001487..6c2f317 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
 obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..c0ca812
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,108 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize I2C:%d", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	cells[0].name = "sky81452-bl";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (IS_ERR_VALUE(ret))
+		dev_err(dev, "failed to add child device:%d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.1");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..142f762
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

[PATCH v2.1 1/7] Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

v2.1:
Clear mfd_cells to zero before setting.
Added of_compatible into mfd_cells

---
 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 156 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..6962b4e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -626,6 +626,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f001487..6c2f317 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
 obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..e91b928
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,111 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize I2C:%d", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-bl";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].of_compatible = "skyworks,sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (IS_ERR_VALUE(ret))
+		dev_err(dev, "failed to add child device:%d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.1");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..142f762
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

Re: [PATCH v2.1 1/7] Adding Skyworks SKY81452 MFD driver

[Lee Jones]

You need a nice commit log here.

> v2.1:
> Clear mfd_cells to zero before setting.
> Added of_compatible into mfd_cells

The changelog should be below the '---' so it doesn't appear in the
commit log.

> ---
>  drivers/mfd/Kconfig          |  12 +++++
>  drivers/mfd/Makefile         |   1 +
>  drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sky81452.h |  32 +++++++++++++
>  4 files changed, 156 insertions(+)
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..6962b4e 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config MFD_SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..6c2f317 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..e91b928
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,111 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_probe(struct i2c_client *client,
> +				const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct mfd_cell cells[2];
> +	struct regmap *regmap;
> +	int ret;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "failed to initialize I2C:%d", PTR_ERR(regmap));

Put a space before %d, or else it looks like a dodgy I2C address.

> +		return PTR_ERR(regmap);
> +	}
> +
> +	i2c_set_clientdata(client, regmap);
> +
> +	memset(cells, 0, sizeof(cells));
> +	cells[0].name = "sky81452-bl";
> +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> +	cells[0].platform_data = pdata->bl_pdata;
> +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> +	cells[1].name = "sky81452-regulator";
> +	cells[1].of_compatible = "skyworks,sky81452-regulator";
> +	cells[1].platform_data = pdata->regulator_init_data;
> +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> +
> +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> +	if (IS_ERR_VALUE(ret))

Just use if (ret).

> +		dev_err(dev, "failed to add child device:%d", ret);

s/device/devices

> +
> +	return ret;
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1.1");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..142f762
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include <linux/sky81452-backlight.h>
> +#include <linux/regulator/machine.h>
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v2.2 1/7] regulator: sky81452: Adding Skyworks SKY81452 MFD driver

[Gyungoh Yoo]

This patch adds SKY81452 MFD driver.
SKY81452 has 2 functions : backlight LED driver and boost converter.
The MFD driver registers I2C regmap and registers the child drivers.

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 156 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..6962b4e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -626,6 +626,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f001487..6c2f317 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
 obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..3455ac7
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,111 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize I2C: %d", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-bl";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].of_compatible = "skyworks,sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (ret)
+		dev_err(dev, "failed to add child devices: %d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..142f762
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

[PATCH v2 2/7] Adding Skyworks SKY81452 regulator driver

[Gyungoh Yoo]

v2:
Added 'compatible' attribute in the driver
Added message for exception or errors.

---
 drivers/regulator/Kconfig              |  11 +++
 drivers/regulator/Makefile             |   1 +
 drivers/regulator/sky81452-regulator.c | 140 +++++++++++++++++++++++++++++++++
 3 files changed, 152 insertions(+)
 create mode 100644 drivers/regulator/sky81452-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 2dc8289..2b05964 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -483,6 +483,17 @@ config REGULATOR_S5M8767
 	 via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and
 	 supports DVS mode with 8bits of output voltage control.
 
+config REGULATOR_SKY81452
+	tristate "Skyworks Solutions SKY81452 voltage regulator"
+	depends on MFD_SKY81452
+	help
+	  This driver supports Skyworks SKY81452 voltage output regulator
+	  via I2C bus. SKY81452 has one voltage linear regulator can be
+	  programmed from 4.5V to 20V.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called sky81452-regulator.
+
 config REGULATOR_ST_PWM
 	tristate "STMicroelectronics PWM voltage regulator"
 	depends on ARCH_STI
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index aa4a6aa..d8206ec 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
 obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
 obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
 obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
new file mode 100644
index 0000000..b9c54c6
--- /dev/null
+++ b/drivers/regulator/sky81452-regulator.c
@@ -0,0 +1,140 @@
+/*
+ * sky81452-regulator.c	SKY81452 regulator driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* registers */
+#define SKY81452_REG1	0x01
+#define SKY81452_REG3	0x03
+
+/* bit mask */
+#define SKY81452_LEN	0x40
+#define SKY81452_LOUT	0x1F
+
+static struct regulator_ops sky81452_reg_ops = {
+	.list_voltage = regulator_list_voltage_linear_range,
+	.map_voltage = regulator_map_voltage_linear_range,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_linear_range sky81452_reg_ranges[] = {
+	REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
+	REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
+};
+
+static const struct regulator_desc sky81452_reg = {
+	.name = "LOUT",
+	.ops = &sky81452_reg_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+	.n_voltages = SKY81452_LOUT + 1,
+	.linear_ranges = sky81452_reg_ranges,
+	.n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
+	.vsel_reg = SKY81452_REG3,
+	.vsel_mask = SKY81452_LOUT,
+	.enable_reg = SKY81452_REG1,
+	.enable_mask = SKY81452_LEN,
+};
+
+#ifdef CONFIG_OF
+static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
+{
+	struct regulator_init_data *init_data;
+	struct device_node *np = of_node_get(dev->of_node);
+
+	if (!np) {
+		dev_err(dev, "regulator node not found");
+		return ERR_PTR(-ENODATA);
+	}
+
+	init_data = of_get_regulator_init_data(dev, np);
+
+	of_node_put(np);
+	return init_data;
+}
+#else
+static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_reg_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct regulator_init_data *init_data = dev_get_platdata(dev);
+	struct regulator_config config = { };
+	struct regulator_dev *rdev;
+
+	if (!init_data) {
+		init_data = sky81452_reg_parse_dt(dev);
+		if (IS_ERR(init_data))
+			return PTR_ERR(init_data);
+	}
+
+	config.dev = dev;
+	config.init_data = init_data;
+	config.of_node = dev->of_node;
+	config.regmap = dev_get_drvdata(dev->parent);
+
+	rdev = devm_regulator_register(dev, &sky81452_reg, &config);
+	if (IS_ERR(rdev)) {
+		dev_err(dev, "failed to register regulator:%d", PTR_ERR(rdev));
+		return PTR_ERR(rdev);
+	}
+
+	platform_set_drvdata(pdev, rdev);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_reg_of_match[] = {
+	{ .compatible = "skyworks,sky81452-regulator", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_reg_of_match);
+#endif
+
+static struct platform_driver sky81452_reg_driver = {
+	.driver = {
+		.name = "sky81452-regulator",
+		.of_match_table = of_match_ptr(sky81452_reg_of_match),
+	},
+	.probe = sky81452_reg_probe,
+};
+
+module_platform_driver(sky81452_reg_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.1");
-- 
1.9.1

Re: [PATCH v2 2/7] Adding Skyworks SKY81452 regulator driver

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 382 bytes --]

On Thu, Aug 28, 2014 at 07:46:37PM +0900, Gyungoh Yoo wrote:
> v2:
> Added 'compatible' attribute in the driver
> Added message for exception or errors.

This driver has already been applied, please send any changes as
incremental patches against current code.  I would *not* expect to see
a compatible being defined for a MFD function device though unless it's
genuinely reusable.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

Re: [PATCH v2 2/7] Adding Skyworks SKY81452 regulator driver

[Gyungoh Yoo]

On Thu, Aug 28, 2014 at 12:02:54PM +0100, Mark Brown wrote:
> On Thu, Aug 28, 2014 at 07:46:37PM +0900, Gyungoh Yoo wrote:
> > v2:
> > Added 'compatible' attribute in the driver
> > Added message for exception or errors.
> 
> This driver has already been applied, please send any changes as
> incremental patches against current code.  I would *not* expect to see
> a compatible being defined for a MFD function device though unless it's
> genuinely reusable.

I am really sorry about confusing. I will resumit this regulator driver as the incremental patches.

BTW,
as Lee Jones-MFD supporter mentioned,
MFD core provides infrastructure for child drivers using compatible.
https://lkml.org/lkml/2014/8/27/132

I want your opinion.

Thank you.

[PATCH v2 3/7] Adding Skyworks SKY81452 backlight driver

[Gyungoh Yoo]

v2:
Added 'compatible' attribute in child drivers
Added messages for exception or errors.

---
 drivers/video/backlight/Kconfig              |  10 +
 drivers/video/backlight/Makefile             |   1 +
 drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++
 include/linux/sky81452-backlight.h           |  47 ++++
 4 files changed, 405 insertions(+)
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/sky81452-backlight.h

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..2586fdd 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
 	  If you have a Pandora console, say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_SKY81452
+	tristate "Backlight driver for SKY81452"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
+	help
+	  If you have a Skyworks SKY81452, say Y to enable the
+	  backlight driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called sky81452-backlight
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..d67073f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..d292026
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,347 @@
+/*
+ * sky81452-backlight.c	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/backlight.h>
+#include <linux/sky81452-backlight.h>
+
+/* registers */
+#define SKY81452_REG0	0x00
+#define SKY81452_REG1	0x01
+#define SKY81452_REG2	0x02
+#define SKY81452_REG4	0x04
+#define SKY81452_REG5	0x05
+
+/* bit mask */
+#define SKY81452_CS	0xFF
+#define SKY81452_EN	0x3F
+#define SKY81452_IGPW	0x20
+#define SKY81452_PWMMD	0x10
+#define SKY81452_PHASE	0x08
+#define SKY81452_ILIM	0x04
+#define SKY81452_VSHRT	0x03
+#define SKY81452_OCP	0x80
+#define SKY81452_OTMP	0x40
+#define SKY81452_SHRT	0x3F
+#define SKY81452_OPN	0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
+
+#define CTZ(b) __builtin_ctz(b)
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+	const struct sky81452_bl_platform_data *pdata =
+			dev_get_platdata(bd->dev.parent);
+	const unsigned int brightness = (unsigned int)bd->props.brightness;
+	struct regmap *regmap = bl_get_data(bd);
+	int ret;
+
+	if (brightness > 0) {
+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+
+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					pdata->enable << CTZ(SKY81452_EN));
+	}
+
+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+	.update_status = sky81452_bl_update_status,
+	.get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					value << CTZ(SKY81452_EN));
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int reg, value = 0;
+	char tmp[3];
+	int i, ret;
+
+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+	ret = regmap_read(regmap, reg, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	if (value & SKY81452_SHRT) {
+		*buf = 0;
+		for (i = 0; i < 6; i++) {
+			if (value & 0x01) {
+				sprintf(tmp, "%d ", i + 1);
+				strcat(buf, tmp);
+			}
+			value >>= 1;
+		}
+		strcat(buf, "\n");
+	} else
+		strcpy(buf, "none\n");
+
+	return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int value = 0;
+	int ret;
+
+	ret = regmap_read(regmap, SKY81452_REG4, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	*buf = 0;
+
+	if (value & SKY81452_OCP)
+		strcat(buf, "over-current ");
+
+	if (value & SKY81452_OTMP)
+		strcat(buf, "over-temperature");
+
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_open.attr,
+	&dev_attr_short.attr,
+	&dev_attr_fault.attr,
+	NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+	.attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	struct device_node *np = of_node_get(dev->of_node);
+	struct sky81452_bl_platform_data *pdata;
+	int ret;
+
+	if (!np) {
+		dev_err(dev, "backlight node not found");
+		return ERR_PTR(-ENODATA);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		of_node_put(np);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	of_property_read_string(np, "name", &pdata->name);
+	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+	if (IS_ERR_VALUE(pdata->gpio_enable))
+		pdata->gpio_enable = -1;
+
+	ret = of_property_read_u32(np, "enable", &pdata->enable);
+	if (IS_ERR_VALUE(ret))
+		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+	ret = of_property_read_u32(np, "short-detection-threshold",
+			&pdata->short_detection_threshold);
+	if (IS_ERR_VALUE(ret))
+		pdata->short_detection_threshold = 7;
+
+	ret = of_property_read_u32(np, "boost-current-limit",
+			&pdata->boost_current_limit);
+	if (IS_ERR_VALUE(ret))
+		pdata->boost_current_limit = 2750;
+
+	of_node_put(np);
+	return pdata;
+}
+#else
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *regmap,
+		struct sky81452_bl_platform_data *pdata)
+{
+	unsigned int value;
+
+	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+	if (pdata->boost_current_limit == 2300)
+		value |= SKY81452_ILIM;
+	else if (pdata->boost_current_limit != 2720)
+		return -EINVAL;
+
+	if (pdata->short_detection_threshold < 4 ||
+				pdata->short_detection_threshold > 7)
+		return -EINVAL;
+	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+	return regmap_write(regmap, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap = dev_get_drvdata(dev->parent);
+	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
+	struct backlight_device *bd;
+	struct backlight_properties props;
+	const char *name;
+	int ret;
+
+	if (!pdata) {
+		pdata = sky81452_bl_parse_dt(dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	if (pdata->gpio_enable >= 0) {
+		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+					GPIOF_OUT_INIT_HIGH, "sky81452-en");
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(dev, "failed to request GPIO:%d", ret);
+			return ret;
+		}
+	}
+
+	ret = sky81452_bl_init_device(regmap, pdata);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to initialize device:%d", ret);
+		return ret;
+	}
+
+	memset(&props, 0, sizeof(props));
+	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+	bd = devm_backlight_device_register(dev, name, dev, regmap,
+						&sky81452_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		dev_err(dev, "failed to register backlight:%d", PTR_ERR(bd));
+		return PTR_ERR(bd);
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to create attribute:%d", ret);
+		goto err;
+	}
+
+	return ret;
+err:
+	backlight_device_unregister(bd);
+	return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+	const struct sky81452_bl_platform_data *pdata =
+						dev_get_platdata(&pdev->dev);
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	if (pdata->gpio_enable >= 0)
+		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_bl_of_match[] = {
+	{ .compatible = "skyworks,sky81452-backlight", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
+#endif
+
+static struct platform_driver sky81452_bl_driver = {
+	.driver = {
+		.name = "sky81452-backlight",
+		.of_match_table = of_match_ptr(sky81452_bl_of_match),
+	},
+	.probe = sky81452_bl_probe,
+	.remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.1");
diff --git a/include/linux/sky81452-backlight.h b/include/linux/sky81452-backlight.h
new file mode 100644
index 0000000..b3635f9
--- /dev/null
+++ b/include/linux/sky81452-backlight.h
@@ -0,0 +1,47 @@
+/*
+ * sky81452.h	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_BACKLIGHT_H
+#define _SKY81452_BACKLIGHT_H
+
+/**
+ * struct sky81452_platform_data
+ * @name:	backlight driver name.
+		If it is not defined, default name is lcd-backlight.
+ * @gpio_enable:GPIO number which control EN pin
+ * @enable:	Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
+ * @ignore_pwm:	true if DPWMI should be ignored.
+ * @dpwm_mode:	true is DPWM dimming mode, otherwise Analog dimming mode.
+ * @phase_shift:true is phase shift mode.
+ * @short_detecion_threshold:	It should be one of 4, 5, 6 and 7V.
+ * @boost_current_limit:	It should be one of 2300, 2750mA.
+ */
+struct sky81452_bl_platform_data {
+	const char *name;
+	int gpio_enable;
+	unsigned int enable;
+	bool ignore_pwm;
+	bool dpwm_mode;
+	bool phase_shift;
+	unsigned int short_detection_threshold;
+	unsigned int boost_current_limit;
+};
+
+#endif
-- 
1.9.1

[PATCH v2 4/7] Adding SKY81452 MFD device tree bindings document

[Gyungoh Yoo]

v2:
Added 'reg' attribute for I2C address in device tree documents

---
 .../devicetree/bindings/i2c/trivial-devices.txt    |  1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt | 32 ++++++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.txt        |  1 +
 3 files changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index 6af570e..ff77879 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -78,6 +78,7 @@ ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sii,s35390a		2-wire CMOS real-time clock
+skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..d61904a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,32 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+- reg		: I2C slave address
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2c {
+		compatible = "skyworks,sky81452";
+		reg = <0x2c>;
+
+		backlight {
+			compatible = "skyworks,sky81452-backlight";
+			name = "pwm-backlight";
+			enable = <0x3F>;
+			ignore-pwm;
+		};
+
+		regulator {
+			compatible = "skyworks,sky81452-regulator";
+			regulator-name = "touch_en";
+			regulator-min-microvolt = <4500000>;
+			regulator-max-microvolt = <8000000>;
+		};
+	};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index ac7269f..c755978 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -125,6 +125,7 @@ silabs	Silicon Laboratories
 simtek
 sii	Seiko Instruments, Inc.
 sirf	SiRF Technology, Inc.
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 solidrun	SolidRun
-- 
1.9.1

[PATCH v2 5/7] Adding SKY81452 regulator device tree bindings document

[Gyungoh Yoo]

v2:
Added 'compatible' attribute in child drivers

---
 .../bindings/regulator/sky81452-regulator.txt          | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
new file mode 100644
index 0000000..7b9ff18
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -0,0 +1,18 @@
+SKY81452 voltage regulator
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452-regulator"
+- any required generic properties defined in regulator.txt
+
+Optional properties:
+- any available generic properties defined in regulator.txt
+
+Example:
+
+	regulator {
+		compatible = "skyworks,sky81452-regulator";
+		/* generic regulator properties */
+		regulator-name = "touch_en";
+		regulator-min-microvolt = <4500000>;
+		regulator-max-microvolt = <8000000>;
+	};
-- 
1.9.1

Re: [PATCH v2 5/7] Adding SKY81452 regulator device tree bindings document

[Gyungoh Yoo]

Please ingnore 'only' this patch.

When sky81452-regulator driver was applied before,
The previous version of this document 'sky81452-regulator.txt' was applied.
I will resubmit the changes as incremental patches against current code of sky81452-regulator.txt.

I am sorry for confusiong.
Thank you.

On Thu, Aug 28, 2014 at 07:58:38PM +0900, Gyungoh Yoo wrote:
> v2:
> Added 'compatible' attribute in child drivers
> 
> ---
>  .../bindings/regulator/sky81452-regulator.txt          | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
> 
> diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
> new file mode 100644
> index 0000000..7b9ff18
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
> @@ -0,0 +1,18 @@
> +SKY81452 voltage regulator
> +
> +Required properties:
> +- compatible	: Must be "skyworks,sky81452-regulator"
> +- any required generic properties defined in regulator.txt
> +
> +Optional properties:
> +- any available generic properties defined in regulator.txt
> +
> +Example:
> +
> +	regulator {
> +		compatible = "skyworks,sky81452-regulator";
> +		/* generic regulator properties */
> +		regulator-name = "touch_en";
> +		regulator-min-microvolt = <4500000>;
> +		regulator-max-microvolt = <8000000>;
> +	};
> -- 
> 1.9.1
> 

[PATCH v2 6/7] Adding SKY81452 backlight device tree bindings document

[Gyungoh Yoo]

v2:
Added 'compatible' attribute in child drivers

---
 .../video/backlight/sky81452-backlight.txt         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..2c2d947
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,24 @@
+SKY81452-backlight bindings
+
+Required properties:
+- compatible		: Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name			: Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable		: GPIO to use to EN pin.
+- enable		: Enable mask for current sink channel 1 to 6.
+- ignore-pwm		: Ignore both PWM input
+- dpwm-mode		: Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift		: Enable phase shift mode
+- ovp-level		: Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold	: It should be one of 4, 5, 6 and 7V.
+- boost-current-limit	: It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+	backlight {
+		compatible = "skyworks,sky81452-backlight";
+		name = "pwm-backlight";
+		enable = <0x3F>;
+		ignore-pwm;
+	};
-- 
1.9.1

[PATCH v2 7/7] Adding SKY81452 backlight document

[Gyungoh Yoo]

v2:
split the patches

---
 Documentation/backlight/sky81452-backlight.txt | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Documentation/backlight/sky81452-backlight.txt

diff --git a/Documentation/backlight/sky81452-backlight.txt b/Documentation/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..39f2f8c
--- /dev/null
+++ b/Documentation/backlight/sky81452-backlight.txt
@@ -0,0 +1,26 @@
+backlight driver for sky81452
+==========================
+
+* Skyworks Solutions SKY81452 :
+  High-Efficiency, Six-Channel White LED Driver with Touch Panel Bias Supply
+
+Description
+-----------
+The SKY81452 is a highly integrated, high-efficiency LED backlight solution for
+tablets, notebook computers, monitors, and other portable devices.
+
+The SKY81452 supports Direct Pulse Width Modulation(DPWM) dimming and Analog
+Pulse Width Modulation (APWM). In the DPWM dimming mode, the output waveform
+follows the Pulse Width Modulation Input(PWMI) signal and the current level is
+set by I2C control and an external RSET resistor. In the APWM mode, the PWMI
+signal duty and the I2C brightness control signal are multiplied to control
+the output current level.
+
+The driver exports some additional attributes for SKY81452 backlight.
+- enable : Current sink channels. Bit0 is for channel 1, Bit1 is for channel 2
+	and Bit2 is for channel 3. In same way, Bit5 is for channel 6.
+	For example, if 5 is written to this attribute, channel 1 and
+	channel 3 are enabled.
+- open : Shows an open LED fault.
+- short : Shows an short LED fault.
+- fault : Shows information about over-current and over-temperature.
-- 
1.9.1

[RESUBMIT PATCH v3 0/8] Adding Skyworks SKY81452 device drivers

[Gyungoh Yoo]

This patch set includes regulator and backlight driver for SKY81452.
Also it includes documents for device tree and module.

v3:
Cleaned-up DBG messages.
Cleaned-up DT.

v2:
Split the patches for each sub-system.
Added 'reg' attribute for I2C address in device tree documents
Added 'compatible' attribute in child drivers
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.

Gyungoh Yoo (8):
  mfd: Add support for Skyworks SKY81452 driver
  backlight: Add support Skyworks SKY81452 backlight driver
  devicetree: mfd: Add new SKY81452 mfd binding
  devicetree: backlight: add new SKY81452 backlight binding
  devicetree: Add vendor prefix for Skyworks Solutions, Inc.
  devicetree: i2c: Add SKY81452 to the Trivial Devices list
  regulator: sky81452: Add compatible string for device binding
  devicetree: regulator: sky81452: Add compatible string for device
    binding

 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt |  32 ++
 .../bindings/regulator/sky81452-regulator.txt      |   2 +
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../video/backlight/sky81452-backlight.txt         |  24 ++
 drivers/mfd/Kconfig                                |  12 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 111 +++++++
 drivers/regulator/sky81452-regulator.c             |  22 +-
 drivers/video/backlight/Kconfig                    |  10 +
 drivers/video/backlight/Makefile                   |   1 +
 drivers/video/backlight/sky81452-backlight.c       | 347 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++
 13 files changed, 590 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/mfd/sky81452.h

-- 
1.9.1

[RESUBMIT PATCH v3 1/8] mfd: Add support for Skyworks SKY81452 driver

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 156 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..6962b4e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -626,6 +626,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f001487..6c2f317 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
 obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..9130112
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,111 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize. err=%ld", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-backlight";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].of_compatible = "skyworks,sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (ret)
+		dev_err(dev, "failed to add child devices. err=%d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..142f762
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

Re: [RESUBMIT PATCH v3 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

You say that this is v3, but there is no change log (usually placed
between the '---' and the diffstat).  Also you have 8 patches in this
set with no 0/8 patch explaining what you're trying to achieve.  For
this size patch you also require a patch commit log.  What does this
driver provide?  How does it provide it?  Once you've addressed these
issues, I'll review your patches.

> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
>  drivers/mfd/Kconfig          |  12 +++++
>  drivers/mfd/Makefile         |   1 +
>  drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sky81452.h |  32 +++++++++++++
>  4 files changed, 156 insertions(+)
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..6962b4e 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config MFD_SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..6c2f317 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..9130112
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,111 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_probe(struct i2c_client *client,
> +				const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct mfd_cell cells[2];
> +	struct regmap *regmap;
> +	int ret;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "failed to initialize. err=%ld", PTR_ERR(regmap));
> +		return PTR_ERR(regmap);
> +	}
> +
> +	i2c_set_clientdata(client, regmap);
> +
> +	memset(cells, 0, sizeof(cells));
> +	cells[0].name = "sky81452-backlight";
> +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> +	cells[0].platform_data = pdata->bl_pdata;
> +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> +	cells[1].name = "sky81452-regulator";
> +	cells[1].of_compatible = "skyworks,sky81452-regulator";
> +	cells[1].platform_data = pdata->regulator_init_data;
> +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> +
> +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> +	if (ret)
> +		dev_err(dev, "failed to add child devices. err=%d", ret);
> +
> +	return ret;
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1.2");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..142f762
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include <linux/sky81452-backlight.h>
> +#include <linux/regulator/machine.h>
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v3 1/8] mfd: Add support for Skyworks SKY81452 driver

[Gyungoh Yoo]

On Tue, Oct 07, 2014 at 09:12:00AM +0100, Lee Jones wrote:
> You say that this is v3, but there is no change log (usually placed
> between the '---' and the diffstat).  Also you have 8 patches in this
> set with no 0/8 patch explaining what you're trying to achieve.  For
> this size patch you also require a patch commit log.  What does this
> driver provide?  How does it provide it?  Once you've addressed these
> issues, I'll review your patches.

I sent 0/8 patch, and it has the change log and what this patch is
trying to do.
Can I ask you to review the patches?
Thank you.

> 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> >  drivers/mfd/Kconfig          |  12 +++++
> >  drivers/mfd/Makefile         |   1 +
> >  drivers/mfd/sky81452.c       | 111 +++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/sky81452.h |  32 +++++++++++++
> >  4 files changed, 156 insertions(+)
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> > 
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index de5abf2..6962b4e 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -626,6 +626,18 @@ config MFD_SM501_GPIO
> >  	 lines on the SM501. The platform data is used to supply the
> >  	 base number for the first GPIO line to register.
> >  
> > +config MFD_SKY81452
> > +	tristate "Skyworks Solutions SKY81452"
> > +	select MFD_CORE
> > +	select REGMAP_I2C
> > +	depends on I2C
> > +	help
> > +	  This is the core driver for the Skyworks SKY81452 backlight and
> > +	  voltage regulator device.
> > +
> > +	  This driver can also be built as a module.  If so, the module
> > +	  will be called sky81452.
> > +
> >  config MFD_SMSC
> >         bool "SMSC ECE1099 series chips"
> >         depends on I2C=y
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index f001487..6c2f317 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
> >  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
> >  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
> >  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> > +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
> >  
> >  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
> >  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> > new file mode 100644
> > index 0000000..9130112
> > --- /dev/null
> > +++ b/drivers/mfd/sky81452.c
> > @@ -0,0 +1,111 @@
> > +/*
> > + * sky81452.c	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/err.h>
> > +#include <linux/slab.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/mfd/sky81452.h>
> > +
> > +static const struct regmap_config sky81452_config = {
> > +	.reg_bits = 8,
> > +	.val_bits = 8,
> > +};
> > +
> > +static int sky81452_probe(struct i2c_client *client,
> > +				const struct i2c_device_id *id)
> > +{
> > +	struct device *dev = &client->dev;
> > +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> > +	struct mfd_cell cells[2];
> > +	struct regmap *regmap;
> > +	int ret;
> > +
> > +	if (!pdata) {
> > +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +		if (!pdata)
> > +			return -ENOMEM;
> > +	}
> > +
> > +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> > +	if (IS_ERR(regmap)) {
> > +		dev_err(dev, "failed to initialize. err=%ld", PTR_ERR(regmap));
> > +		return PTR_ERR(regmap);
> > +	}
> > +
> > +	i2c_set_clientdata(client, regmap);
> > +
> > +	memset(cells, 0, sizeof(cells));
> > +	cells[0].name = "sky81452-backlight";
> > +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> > +	cells[0].platform_data = pdata->bl_pdata;
> > +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> > +	cells[1].name = "sky81452-regulator";
> > +	cells[1].of_compatible = "skyworks,sky81452-regulator";
> > +	cells[1].platform_data = pdata->regulator_init_data;
> > +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> > +
> > +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> > +	if (ret)
> > +		dev_err(dev, "failed to add child devices. err=%d", ret);
> > +
> > +	return ret;
> > +}
> > +
> > +static int sky81452_remove(struct i2c_client *client)
> > +{
> > +	mfd_remove_devices(&client->dev);
> > +	return 0;
> > +}
> > +
> > +static const struct i2c_device_id sky81452_ids[] = {
> > +	{ "sky81452" },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +	{ .compatible = "skyworks,sky81452", },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> > +
> > +static struct i2c_driver sky81452_driver = {
> > +	.driver = {
> > +		.name = "sky81452",
> > +		.of_match_table = of_match_ptr(sky81452_of_match),
> > +	},
> > +	.probe = sky81452_probe,
> > +	.remove = sky81452_remove,
> > +	.id_table = sky81452_ids,
> > +};
> > +
> > +module_i2c_driver(sky81452_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL");
> > +MODULE_VERSION("1.2");
> > diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> > new file mode 100644
> > index 0000000..142f762
> > --- /dev/null
> > +++ b/include/linux/mfd/sky81452.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * sky81452.h	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _SKY81452_H
> > +#define _SKY81452_H
> > +
> > +#include <linux/sky81452-backlight.h>
> > +#include <linux/regulator/machine.h>
> > +
> > +struct sky81452_platform_data {
> > +	struct sky81452_bl_platform_data *bl_pdata;
> > +	struct regulator_init_data *regulator_init_data;
> > +};
> > +
> > +#endif
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

[RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 drivers/video/backlight/Kconfig              |  10 +
 drivers/video/backlight/Makefile             |   1 +
 drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++
 3 files changed, 358 insertions(+)
 create mode 100644 drivers/video/backlight/sky81452-backlight.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..2586fdd 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
 	  If you have a Pandora console, say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_SKY81452
+	tristate "Backlight driver for SKY81452"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
+	help
+	  If you have a Skyworks SKY81452, say Y to enable the
+	  backlight driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called sky81452-backlight
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..d67073f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..101399d
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,347 @@
+/*
+ * sky81452-backlight.c	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/backlight.h>
+#include <linux/sky81452-backlight.h>
+
+/* registers */
+#define SKY81452_REG0	0x00
+#define SKY81452_REG1	0x01
+#define SKY81452_REG2	0x02
+#define SKY81452_REG4	0x04
+#define SKY81452_REG5	0x05
+
+/* bit mask */
+#define SKY81452_CS	0xFF
+#define SKY81452_EN	0x3F
+#define SKY81452_IGPW	0x20
+#define SKY81452_PWMMD	0x10
+#define SKY81452_PHASE	0x08
+#define SKY81452_ILIM	0x04
+#define SKY81452_VSHRT	0x03
+#define SKY81452_OCP	0x80
+#define SKY81452_OTMP	0x40
+#define SKY81452_SHRT	0x3F
+#define SKY81452_OPN	0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
+
+#define CTZ(b) __builtin_ctz(b)
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+	const struct sky81452_bl_platform_data *pdata =
+			dev_get_platdata(bd->dev.parent);
+	const unsigned int brightness = (unsigned int)bd->props.brightness;
+	struct regmap *regmap = bl_get_data(bd);
+	int ret;
+
+	if (brightness > 0) {
+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+
+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					pdata->enable << CTZ(SKY81452_EN));
+	}
+
+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+	.update_status = sky81452_bl_update_status,
+	.get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					value << CTZ(SKY81452_EN));
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int reg, value = 0;
+	char tmp[3];
+	int i, ret;
+
+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+	ret = regmap_read(regmap, reg, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	if (value & SKY81452_SHRT) {
+		*buf = 0;
+		for (i = 0; i < 6; i++) {
+			if (value & 0x01) {
+				sprintf(tmp, "%d ", i + 1);
+				strcat(buf, tmp);
+			}
+			value >>= 1;
+		}
+		strcat(buf, "\n");
+	} else
+		strcpy(buf, "none\n");
+
+	return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int value = 0;
+	int ret;
+
+	ret = regmap_read(regmap, SKY81452_REG4, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	*buf = 0;
+
+	if (value & SKY81452_OCP)
+		strcat(buf, "over-current ");
+
+	if (value & SKY81452_OTMP)
+		strcat(buf, "over-temperature");
+
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_open.attr,
+	&dev_attr_short.attr,
+	&dev_attr_fault.attr,
+	NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+	.attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	struct device_node *np = of_node_get(dev->of_node);
+	struct sky81452_bl_platform_data *pdata;
+	int ret;
+
+	if (!np) {
+		dev_err(dev, "backlight node not found");
+		return ERR_PTR(-ENODATA);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		of_node_put(np);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	of_property_read_string(np, "name", &pdata->name);
+	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+	if (IS_ERR_VALUE(pdata->gpio_enable))
+		pdata->gpio_enable = -1;
+
+	ret = of_property_read_u32(np, "enable", &pdata->enable);
+	if (IS_ERR_VALUE(ret))
+		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+	ret = of_property_read_u32(np, "short-detection-threshold",
+			&pdata->short_detection_threshold);
+	if (IS_ERR_VALUE(ret))
+		pdata->short_detection_threshold = 7;
+
+	ret = of_property_read_u32(np, "boost-current-limit",
+			&pdata->boost_current_limit);
+	if (IS_ERR_VALUE(ret))
+		pdata->boost_current_limit = 2750;
+
+	of_node_put(np);
+	return pdata;
+}
+#else
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *regmap,
+		struct sky81452_bl_platform_data *pdata)
+{
+	unsigned int value;
+
+	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+	if (pdata->boost_current_limit == 2300)
+		value |= SKY81452_ILIM;
+	else if (pdata->boost_current_limit != 2720)
+		return -EINVAL;
+
+	if (pdata->short_detection_threshold < 4 ||
+				pdata->short_detection_threshold > 7)
+		return -EINVAL;
+	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+	return regmap_write(regmap, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap = dev_get_drvdata(dev->parent);
+	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
+	struct backlight_device *bd;
+	struct backlight_properties props;
+	const char *name;
+	int ret;
+
+	if (!pdata) {
+		pdata = sky81452_bl_parse_dt(dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	if (pdata->gpio_enable >= 0) {
+		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+					GPIOF_OUT_INIT_HIGH, "sky81452-en");
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(dev, "failed to request GPIO. err=%d", ret);
+			return ret;
+		}
+	}
+
+	ret = sky81452_bl_init_device(regmap, pdata);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to initialize. err=%d", ret);
+		return ret;
+	}
+
+	memset(&props, 0, sizeof(props));
+	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+	bd = devm_backlight_device_register(dev, name, dev, regmap,
+						&sky81452_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd));
+		return PTR_ERR(bd);
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to create attribute. err=%d", ret);
+		goto err;
+	}
+
+	return ret;
+err:
+	backlight_device_unregister(bd);
+	return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+	const struct sky81452_bl_platform_data *pdata =
+						dev_get_platdata(&pdev->dev);
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	if (pdata->gpio_enable >= 0)
+		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_bl_of_match[] = {
+	{ .compatible = "skyworks,sky81452-backlight", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
+#endif
+
+static struct platform_driver sky81452_bl_driver = {
+	.driver = {
+		.name = "sky81452-backlight",
+		.of_match_table = of_match_ptr(sky81452_bl_of_match),
+	},
+	.probe = sky81452_bl_probe,
+	.remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.2");
-- 
1.9.1

Re: [RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Jingoo Han]

On Tuesday, October 07, 2014 2:01 PM, Gyungoh Yoo wrote:
> 

If possible, please add more detailed commit message for this patch.

> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
>  drivers/video/backlight/Kconfig              |  10 +
>  drivers/video/backlight/Makefile             |   1 +
>  drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++
>  3 files changed, 358 insertions(+)
>  create mode 100644 drivers/video/backlight/sky81452-backlight.c
> 
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 8d03924..2586fdd 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
>  	  If you have a Pandora console, say Y to enable the
>  	  backlight driver.
> 
> +config BACKLIGHT_SKY81452
> +	tristate "Backlight driver for SKY81452"
> +	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
> +	help
> +	  If you have a Skyworks SKY81452, say Y to enable the
> +	  backlight driver.
> +
> +	  To compile this driver as a module, choose M here: the module will
> +	  be called sky81452-backlight
> +
>  config BACKLIGHT_TPS65217
>  	tristate "TPS65217 Backlight"
>  	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index fcd50b73..d67073f 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
>  obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
>  obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
>  obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
> +obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
>  obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
>  obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
>  obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
> diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-
> backlight.c
> new file mode 100644
> index 0000000..101399d
> --- /dev/null
> +++ b/drivers/video/backlight/sky81452-backlight.c
> @@ -0,0 +1,347 @@
> +/*
> + * sky81452-backlight.c	SKY81452 backlight driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/regmap.h>
> +#include <linux/backlight.h>
> +#include <linux/sky81452-backlight.h>

Please, re-order these headers alphabetically.
It enhances the readability.

> +
> +/* registers */
> +#define SKY81452_REG0	0x00
> +#define SKY81452_REG1	0x01
> +#define SKY81452_REG2	0x02
> +#define SKY81452_REG4	0x04
> +#define SKY81452_REG5	0x05
> +
> +/* bit mask */
> +#define SKY81452_CS	0xFF
> +#define SKY81452_EN	0x3F
> +#define SKY81452_IGPW	0x20
> +#define SKY81452_PWMMD	0x10
> +#define SKY81452_PHASE	0x08
> +#define SKY81452_ILIM	0x04
> +#define SKY81452_VSHRT	0x03
> +#define SKY81452_OCP	0x80
> +#define SKY81452_OTMP	0x40
> +#define SKY81452_SHRT	0x3F
> +#define SKY81452_OPN	0x3F
> +
> +#define SKY81452_DEFAULT_NAME "lcd-backlight"
> +#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
> +
> +#define CTZ(b) __builtin_ctz(b)
> +
> +static int sky81452_bl_update_status(struct backlight_device *bd)
> +{
> +	const struct sky81452_bl_platform_data *pdata =
> +			dev_get_platdata(bd->dev.parent);
> +	const unsigned int brightness = (unsigned int)bd->props.brightness;
> +	struct regmap *regmap = bl_get_data(bd);
> +	int ret;
> +
> +	if (brightness > 0) {
> +		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
> +		if (IS_ERR_VALUE(ret))
> +			return ret;
> +
> +		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> +					pdata->enable << CTZ(SKY81452_EN));
> +	}
> +
> +	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
> +}
> +
> +static int sky81452_bl_get_brightness(struct backlight_device *bd)
> +{
> +	return bd->props.brightness;
> +}
> +
> +static const struct backlight_ops sky81452_bl_ops = {
> +	.update_status = sky81452_bl_update_status,
> +	.get_brightness = sky81452_bl_get_brightness,
> +};
> +
> +static ssize_t sky81452_bl_store_enable(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t count)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned long value;
> +	int ret;
> +
> +	ret = kstrtoul(buf, 16, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> +					value << CTZ(SKY81452_EN));
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	return count;
> +}
> +
> +static ssize_t sky81452_bl_show_open_short(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned int reg, value = 0;
> +	char tmp[3];
> +	int i, ret;
> +
> +	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
> +	ret = regmap_read(regmap, reg, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	if (value & SKY81452_SHRT) {
> +		*buf = 0;
> +		for (i = 0; i < 6; i++) {
> +			if (value & 0x01) {
> +				sprintf(tmp, "%d ", i + 1);
> +				strcat(buf, tmp);
> +			}
> +			value >>= 1;
> +		}
> +		strcat(buf, "\n");
> +	} else
> +		strcpy(buf, "none\n");

Please add braces to 'else' statement. 

If only one branch of a conditional statement is a single
statement. Braces are needed.

	if () {
		... (multi lines)
	} else {
		...
	}


> +
> +	return strlen(buf);
> +}
> +
> +static ssize_t sky81452_bl_show_fault(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned int value = 0;
> +	int ret;
> +
> +	ret = regmap_read(regmap, SKY81452_REG4, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	*buf = 0;
> +
> +	if (value & SKY81452_OCP)
> +		strcat(buf, "over-current ");
> +
> +	if (value & SKY81452_OTMP)
> +		strcat(buf, "over-temperature");
> +
> +	strcat(buf, "\n");
> +	return strlen(buf);
> +}
> +
> +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
> +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
> +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
> +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
> +
> +static struct attribute *sky81452_bl_attribute[] = {
> +	&dev_attr_enable.attr,
> +	&dev_attr_open.attr,
> +	&dev_attr_short.attr,
> +	&dev_attr_fault.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group sky81452_bl_attr_group = {
> +	.attrs = sky81452_bl_attribute,
> +};
> +
> +#ifdef CONFIG_OF
> +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> +							struct device *dev)
> +{
> +	struct device_node *np = of_node_get(dev->of_node);
> +	struct sky81452_bl_platform_data *pdata;
> +	int ret;
> +
> +	if (!np) {
> +		dev_err(dev, "backlight node not found");
> +		return ERR_PTR(-ENODATA);
> +	}
> +
> +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +	if (!pdata) {
> +		of_node_put(np);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	of_property_read_string(np, "name", &pdata->name);
> +	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
> +	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
> +	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
> +
> +	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
> +	if (IS_ERR_VALUE(pdata->gpio_enable))
> +		pdata->gpio_enable = -1;
> +
> +	ret = of_property_read_u32(np, "enable", &pdata->enable);
> +	if (IS_ERR_VALUE(ret))
> +		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
> +
> +	ret = of_property_read_u32(np, "short-detection-threshold",
> +			&pdata->short_detection_threshold);
> +	if (IS_ERR_VALUE(ret))
> +		pdata->short_detection_threshold = 7;
> +
> +	ret = of_property_read_u32(np, "boost-current-limit",
> +			&pdata->boost_current_limit);
> +	if (IS_ERR_VALUE(ret))
> +		pdata->boost_current_limit = 2750;
> +
> +	of_node_put(np);
> +	return pdata;
> +}
> +#else
> +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> +							struct device *dev)
> +{
> +	return ERR_PTR(-EINVAL);
> +}
> +#endif
> +
> +static int sky81452_bl_init_device(struct regmap *regmap,
> +		struct sky81452_bl_platform_data *pdata)
> +{
> +	unsigned int value;
> +
> +	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
> +	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
> +	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
> +
> +	if (pdata->boost_current_limit == 2300)
> +		value |= SKY81452_ILIM;
> +	else if (pdata->boost_current_limit != 2720)
> +		return -EINVAL;
> +
> +	if (pdata->short_detection_threshold < 4 ||
> +				pdata->short_detection_threshold > 7)
> +		return -EINVAL;
> +	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
> +
> +	return regmap_write(regmap, SKY81452_REG2, value);
> +}
> +
> +static int sky81452_bl_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct regmap *regmap = dev_get_drvdata(dev->parent);
> +	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
> +	struct backlight_device *bd;
> +	struct backlight_properties props;
> +	const char *name;
> +	int ret;
> +
> +	if (!pdata) {
> +		pdata = sky81452_bl_parse_dt(dev);
> +		if (IS_ERR(pdata))
> +			return PTR_ERR(pdata);
> +	}
> +
> +	if (pdata->gpio_enable >= 0) {
> +		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
> +					GPIOF_OUT_INIT_HIGH, "sky81452-en");
> +		if (IS_ERR_VALUE(ret)) {
> +			dev_err(dev, "failed to request GPIO. err=%d", ret);
> +			return ret;
> +		}
> +	}
> +
> +	ret = sky81452_bl_init_device(regmap, pdata);
> +	if (IS_ERR_VALUE(ret)) {
> +		dev_err(dev, "failed to initialize. err=%d", ret);
> +		return ret;
> +	}
> +
> +	memset(&props, 0, sizeof(props));
> +	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
> +	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
> +	bd = devm_backlight_device_register(dev, name, dev, regmap,
> +						&sky81452_bl_ops, &props);
> +	if (IS_ERR(bd)) {
> +		dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd));
> +		return PTR_ERR(bd);
> +	}
> +
> +	platform_set_drvdata(pdev, bd);
> +
> +	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
> +	if (IS_ERR_VALUE(ret)) {
> +		dev_err(dev, "failed to create attribute. err=%d", ret);
> +		goto err;
> +	}
> +
> +	return ret;
> +err:
> +	backlight_device_unregister(bd);

This backlight_device_unregister() is NOT necessary.
This is because backlight_device_unregister will be called
automatically, when devm_backlight_device_register() is used
and error returns.

> +	return ret;
> +}
> +
> +static int sky81452_bl_remove(struct platform_device *pdev)
> +{
> +	const struct sky81452_bl_platform_data *pdata =
> +						dev_get_platdata(&pdev->dev);
> +	struct backlight_device *bd = platform_get_drvdata(pdev);
> +
> +	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
> +
> +	bd->props.power = FB_BLANK_UNBLANK;
> +	bd->props.brightness = 0;
> +	backlight_update_status(bd);
> +
> +	if (pdata->gpio_enable >= 0)
> +		gpio_set_value_cansleep(pdata->gpio_enable, 0);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_bl_of_match[] = {
> +	{ .compatible = "skyworks,sky81452-backlight", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
> +#endif
> +
> +static struct platform_driver sky81452_bl_driver = {
> +	.driver = {
> +		.name = "sky81452-backlight",
> +		.of_match_table = of_match_ptr(sky81452_bl_of_match),
> +	},
> +	.probe = sky81452_bl_probe,
> +	.remove = sky81452_bl_remove,
> +};
> +
> +module_platform_driver(sky81452_bl_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL");

How about using 'GPL v2'?

> +MODULE_VERSION("1.2");
> --
> 1.9.1

Re: [RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Gyungoh Yoo]

On Wed, Oct 08, 2014 at 10:03:57AM +0900, Jingoo Han wrote:
> On Tuesday, October 07, 2014 2:01 PM, Gyungoh Yoo wrote:
> > 
> 
> If possible, please add more detailed commit message for this patch.
> 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> >  drivers/video/backlight/Kconfig              |  10 +
> >  drivers/video/backlight/Makefile             |   1 +
> >  drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++
> >  3 files changed, 358 insertions(+)
> >  create mode 100644 drivers/video/backlight/sky81452-backlight.c
> > 
> > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> > index 8d03924..2586fdd 100644
> > --- a/drivers/video/backlight/Kconfig
> > +++ b/drivers/video/backlight/Kconfig
> > @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
> >  	  If you have a Pandora console, say Y to enable the
> >  	  backlight driver.
> > 
> > +config BACKLIGHT_SKY81452
> > +	tristate "Backlight driver for SKY81452"
> > +	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
> > +	help
> > +	  If you have a Skyworks SKY81452, say Y to enable the
> > +	  backlight driver.
> > +
> > +	  To compile this driver as a module, choose M here: the module will
> > +	  be called sky81452-backlight
> > +
> >  config BACKLIGHT_TPS65217
> >  	tristate "TPS65217 Backlight"
> >  	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
> > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> > index fcd50b73..d67073f 100644
> > --- a/drivers/video/backlight/Makefile
> > +++ b/drivers/video/backlight/Makefile
> > @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
> >  obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
> >  obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
> >  obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
> > +obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
> >  obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
> >  obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
> >  obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
> > diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-
> > backlight.c
> > new file mode 100644
> > index 0000000..101399d
> > --- /dev/null
> > +++ b/drivers/video/backlight/sky81452-backlight.c
> > @@ -0,0 +1,347 @@
> > +/*
> > + * sky81452-backlight.c	SKY81452 backlight driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/slab.h>
> > +#include <linux/of.h>
> > +#include <linux/err.h>
> > +#include <linux/gpio.h>
> > +#include <linux/of_gpio.h>
> > +#include <linux/regmap.h>
> > +#include <linux/backlight.h>
> > +#include <linux/sky81452-backlight.h>
> 
> Please, re-order these headers alphabetically.
> It enhances the readability.

I see.

> 
> > +
> > +/* registers */
> > +#define SKY81452_REG0	0x00
> > +#define SKY81452_REG1	0x01
> > +#define SKY81452_REG2	0x02
> > +#define SKY81452_REG4	0x04
> > +#define SKY81452_REG5	0x05
> > +
> > +/* bit mask */
> > +#define SKY81452_CS	0xFF
> > +#define SKY81452_EN	0x3F
> > +#define SKY81452_IGPW	0x20
> > +#define SKY81452_PWMMD	0x10
> > +#define SKY81452_PHASE	0x08
> > +#define SKY81452_ILIM	0x04
> > +#define SKY81452_VSHRT	0x03
> > +#define SKY81452_OCP	0x80
> > +#define SKY81452_OTMP	0x40
> > +#define SKY81452_SHRT	0x3F
> > +#define SKY81452_OPN	0x3F
> > +
> > +#define SKY81452_DEFAULT_NAME "lcd-backlight"
> > +#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
> > +
> > +#define CTZ(b) __builtin_ctz(b)
> > +
> > +static int sky81452_bl_update_status(struct backlight_device *bd)
> > +{
> > +	const struct sky81452_bl_platform_data *pdata =
> > +			dev_get_platdata(bd->dev.parent);
> > +	const unsigned int brightness = (unsigned int)bd->props.brightness;
> > +	struct regmap *regmap = bl_get_data(bd);
> > +	int ret;
> > +
> > +	if (brightness > 0) {
> > +		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
> > +		if (IS_ERR_VALUE(ret))
> > +			return ret;
> > +
> > +		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> > +					pdata->enable << CTZ(SKY81452_EN));
> > +	}
> > +
> > +	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
> > +}
> > +
> > +static int sky81452_bl_get_brightness(struct backlight_device *bd)
> > +{
> > +	return bd->props.brightness;
> > +}
> > +
> > +static const struct backlight_ops sky81452_bl_ops = {
> > +	.update_status = sky81452_bl_update_status,
> > +	.get_brightness = sky81452_bl_get_brightness,
> > +};
> > +
> > +static ssize_t sky81452_bl_store_enable(struct device *dev,
> > +		struct device_attribute *attr, const char *buf, size_t count)
> > +{
> > +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> > +	unsigned long value;
> > +	int ret;
> > +
> > +	ret = kstrtoul(buf, 16, &value);
> > +	if (IS_ERR_VALUE(ret))
> > +		return ret;
> > +
> > +	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> > +					value << CTZ(SKY81452_EN));
> > +	if (IS_ERR_VALUE(ret))
> > +		return ret;
> > +
> > +	return count;
> > +}
> > +
> > +static ssize_t sky81452_bl_show_open_short(struct device *dev,
> > +		struct device_attribute *attr, char *buf)
> > +{
> > +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> > +	unsigned int reg, value = 0;
> > +	char tmp[3];
> > +	int i, ret;
> > +
> > +	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
> > +	ret = regmap_read(regmap, reg, &value);
> > +	if (IS_ERR_VALUE(ret))
> > +		return ret;
> > +
> > +	if (value & SKY81452_SHRT) {
> > +		*buf = 0;
> > +		for (i = 0; i < 6; i++) {
> > +			if (value & 0x01) {
> > +				sprintf(tmp, "%d ", i + 1);
> > +				strcat(buf, tmp);
> > +			}
> > +			value >>= 1;
> > +		}
> > +		strcat(buf, "\n");
> > +	} else
> > +		strcpy(buf, "none\n");
> 
> Please add braces to 'else' statement. 
> 
> If only one branch of a conditional statement is a single
> statement. Braces are needed.
> 
> 	if () {
> 		... (multi lines)
> 	} else {
> 		...
> 	}

I see.

> 
> 
> > +
> > +	return strlen(buf);
> > +}
> > +
> > +static ssize_t sky81452_bl_show_fault(struct device *dev,
> > +		struct device_attribute *attr, char *buf)
> > +{
> > +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> > +	unsigned int value = 0;
> > +	int ret;
> > +
> > +	ret = regmap_read(regmap, SKY81452_REG4, &value);
> > +	if (IS_ERR_VALUE(ret))
> > +		return ret;
> > +
> > +	*buf = 0;
> > +
> > +	if (value & SKY81452_OCP)
> > +		strcat(buf, "over-current ");
> > +
> > +	if (value & SKY81452_OTMP)
> > +		strcat(buf, "over-temperature");
> > +
> > +	strcat(buf, "\n");
> > +	return strlen(buf);
> > +}
> > +
> > +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
> > +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
> > +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
> > +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
> > +
> > +static struct attribute *sky81452_bl_attribute[] = {
> > +	&dev_attr_enable.attr,
> > +	&dev_attr_open.attr,
> > +	&dev_attr_short.attr,
> > +	&dev_attr_fault.attr,
> > +	NULL
> > +};
> > +
> > +static const struct attribute_group sky81452_bl_attr_group = {
> > +	.attrs = sky81452_bl_attribute,
> > +};
> > +
> > +#ifdef CONFIG_OF
> > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> > +							struct device *dev)
> > +{
> > +	struct device_node *np = of_node_get(dev->of_node);
> > +	struct sky81452_bl_platform_data *pdata;
> > +	int ret;
> > +
> > +	if (!np) {
> > +		dev_err(dev, "backlight node not found");
> > +		return ERR_PTR(-ENODATA);
> > +	}
> > +
> > +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +	if (!pdata) {
> > +		of_node_put(np);
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +
> > +	of_property_read_string(np, "name", &pdata->name);
> > +	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
> > +	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
> > +	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
> > +
> > +	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
> > +	if (IS_ERR_VALUE(pdata->gpio_enable))
> > +		pdata->gpio_enable = -1;
> > +
> > +	ret = of_property_read_u32(np, "enable", &pdata->enable);
> > +	if (IS_ERR_VALUE(ret))
> > +		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
> > +
> > +	ret = of_property_read_u32(np, "short-detection-threshold",
> > +			&pdata->short_detection_threshold);
> > +	if (IS_ERR_VALUE(ret))
> > +		pdata->short_detection_threshold = 7;
> > +
> > +	ret = of_property_read_u32(np, "boost-current-limit",
> > +			&pdata->boost_current_limit);
> > +	if (IS_ERR_VALUE(ret))
> > +		pdata->boost_current_limit = 2750;
> > +
> > +	of_node_put(np);
> > +	return pdata;
> > +}
> > +#else
> > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> > +							struct device *dev)
> > +{
> > +	return ERR_PTR(-EINVAL);
> > +}
> > +#endif
> > +
> > +static int sky81452_bl_init_device(struct regmap *regmap,
> > +		struct sky81452_bl_platform_data *pdata)
> > +{
> > +	unsigned int value;
> > +
> > +	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
> > +	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
> > +	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
> > +
> > +	if (pdata->boost_current_limit == 2300)
> > +		value |= SKY81452_ILIM;
> > +	else if (pdata->boost_current_limit != 2720)
> > +		return -EINVAL;
> > +
> > +	if (pdata->short_detection_threshold < 4 ||
> > +				pdata->short_detection_threshold > 7)
> > +		return -EINVAL;
> > +	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
> > +
> > +	return regmap_write(regmap, SKY81452_REG2, value);
> > +}
> > +
> > +static int sky81452_bl_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct regmap *regmap = dev_get_drvdata(dev->parent);
> > +	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
> > +	struct backlight_device *bd;
> > +	struct backlight_properties props;
> > +	const char *name;
> > +	int ret;
> > +
> > +	if (!pdata) {
> > +		pdata = sky81452_bl_parse_dt(dev);
> > +		if (IS_ERR(pdata))
> > +			return PTR_ERR(pdata);
> > +	}
> > +
> > +	if (pdata->gpio_enable >= 0) {
> > +		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
> > +					GPIOF_OUT_INIT_HIGH, "sky81452-en");
> > +		if (IS_ERR_VALUE(ret)) {
> > +			dev_err(dev, "failed to request GPIO. err=%d", ret);
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	ret = sky81452_bl_init_device(regmap, pdata);
> > +	if (IS_ERR_VALUE(ret)) {
> > +		dev_err(dev, "failed to initialize. err=%d", ret);
> > +		return ret;
> > +	}
> > +
> > +	memset(&props, 0, sizeof(props));
> > +	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
> > +	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
> > +	bd = devm_backlight_device_register(dev, name, dev, regmap,
> > +						&sky81452_bl_ops, &props);
> > +	if (IS_ERR(bd)) {
> > +		dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd));
> > +		return PTR_ERR(bd);
> > +	}
> > +
> > +	platform_set_drvdata(pdev, bd);
> > +
> > +	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
> > +	if (IS_ERR_VALUE(ret)) {
> > +		dev_err(dev, "failed to create attribute. err=%d", ret);
> > +		goto err;
> > +	}
> > +
> > +	return ret;
> > +err:
> > +	backlight_device_unregister(bd);
> 
> This backlight_device_unregister() is NOT necessary.
> This is because backlight_device_unregister will be called
> automatically, when devm_backlight_device_register() is used
> and error returns.

I see. 

> 
> > +	return ret;
> > +}
> > +
> > +static int sky81452_bl_remove(struct platform_device *pdev)
> > +{
> > +	const struct sky81452_bl_platform_data *pdata =
> > +						dev_get_platdata(&pdev->dev);
> > +	struct backlight_device *bd = platform_get_drvdata(pdev);
> > +
> > +	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
> > +
> > +	bd->props.power = FB_BLANK_UNBLANK;
> > +	bd->props.brightness = 0;
> > +	backlight_update_status(bd);
> > +
> > +	if (pdata->gpio_enable >= 0)
> > +		gpio_set_value_cansleep(pdata->gpio_enable, 0);
> > +
> > +	return 0;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_bl_of_match[] = {
> > +	{ .compatible = "skyworks,sky81452-backlight", },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
> > +#endif
> > +
> > +static struct platform_driver sky81452_bl_driver = {
> > +	.driver = {
> > +		.name = "sky81452-backlight",
> > +		.of_match_table = of_match_ptr(sky81452_bl_of_match),
> > +	},
> > +	.probe = sky81452_bl_probe,
> > +	.remove = sky81452_bl_remove,
> > +};
> > +
> > +module_platform_driver(sky81452_bl_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL");
> 
> How about using 'GPL v2'?

I will change it.
Thanks you so much for your review.

> 
> > +MODULE_VERSION("1.2");
> > --
> > 1.9.1
> 

[RESUBMIT PATCH v3 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 Documentation/devicetree/bindings/mfd/sky81452.txt | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..d61904a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,32 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+- reg		: I2C slave address
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2c {
+		compatible = "skyworks,sky81452";
+		reg = <0x2c>;
+
+		backlight {
+			compatible = "skyworks,sky81452-backlight";
+			name = "pwm-backlight";
+			enable = <0x3F>;
+			ignore-pwm;
+		};
+
+		regulator {
+			compatible = "skyworks,sky81452-regulator";
+			regulator-name = "touch_en";
+			regulator-min-microvolt = <4500000>;
+			regulator-max-microvolt = <8000000>;
+		};
+	};
-- 
1.9.1

[RESUBMIT PATCH v3 4/8] devicetree: backlight: add new SKY81452 backlight binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 .../video/backlight/sky81452-backlight.txt         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..2c2d947
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,24 @@
+SKY81452-backlight bindings
+
+Required properties:
+- compatible		: Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name			: Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable		: GPIO to use to EN pin.
+- enable		: Enable mask for current sink channel 1 to 6.
+- ignore-pwm		: Ignore both PWM input
+- dpwm-mode		: Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift		: Enable phase shift mode
+- ovp-level		: Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold	: It should be one of 4, 5, 6 and 7V.
+- boost-current-limit	: It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+	backlight {
+		compatible = "skyworks,sky81452-backlight";
+		name = "pwm-backlight";
+		enable = <0x3F>;
+		ignore-pwm;
+	};
-- 
1.9.1

[RESUBMIT PATCH v3 5/8] devicetree: Add vendor prefix for Skyworks Solutions, Inc.

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index ac7269f..c755978 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -125,6 +125,7 @@ silabs	Silicon Laboratories
 simtek
 sii	Seiko Instruments, Inc.
 sirf	SiRF Technology, Inc.
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 solidrun	SolidRun
-- 
1.9.1

[RESUBMIT PATCH v3 6/8] devicetree: i2c: Add SKY81452 to the Trivial Devices list

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 Documentation/devicetree/bindings/i2c/trivial-devices.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index 6af570e..ff77879 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -78,6 +78,7 @@ ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sii,s35390a		2-wire CMOS real-time clock
+skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
-- 
1.9.1

[RESUBMIT PATCH v3 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 drivers/regulator/sky81452-regulator.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
index 97aff0c..f895d1b 100644
--- a/drivers/regulator/sky81452-regulator.c
+++ b/drivers/regulator/sky81452-regulator.c
@@ -68,12 +68,11 @@ static const struct regulator_desc sky81452_reg = {
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
 {
 	struct regulator_init_data *init_data;
-	struct device_node *np;
+	struct device_node *np = of_node_get(dev->of_node);
 
-	np = of_get_child_by_name(dev->parent->of_node, "regulator");
-	if (unlikely(!np)) {
+	if (!np) {
 		dev_err(dev, "regulator node not found");
-		return NULL;
+		return ERR_PTR(-ENODATA);
 	}
 
 	init_data = of_get_regulator_init_data(dev, np);
@@ -107,17 +106,28 @@ static int sky81452_reg_probe(struct platform_device *pdev)
 	config.regmap = dev_get_drvdata(dev->parent);
 
 	rdev = devm_regulator_register(dev, &sky81452_reg, &config);
-	if (IS_ERR(rdev))
+	if (IS_ERR(rdev)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(rdev));
 		return PTR_ERR(rdev);
+	}
 
 	platform_set_drvdata(pdev, rdev);
 
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_reg_of_match[] = {
+	{ .compatible = "skyworks,sky81452-regulator", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_reg_of_match);
+#endif
+
 static struct platform_driver sky81452_reg_driver = {
 	.driver = {
 		.name = "sky81452-regulator",
+		.of_match_table = of_match_ptr(sky81452_reg_of_match),
 	},
 	.probe = sky81452_reg_probe,
 };
@@ -127,4 +137,4 @@ module_platform_driver(sky81452_reg_driver);
 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
 MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
+MODULE_VERSION("1.2");
-- 
1.9.1

Re: [RESUBMIT PATCH v3 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 639 bytes --]

On Tue, Oct 07, 2014 at 02:11:07PM +0900, Gyungoh Yoo wrote:
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Several problems here:

 - I don't have patches 1-6 or the cover letter for this series - what
   are the dependencies?
 - I can't see any sign that my concerns about the driver not actually
   being reusable have been addressed here.
 - This patch appears to do way more than add a compatible string, for
   example:

> -	np = of_get_child_by_name(dev->parent->of_node, "regulator");
> -	if (unlikely(!np)) {
> +	if (!np) {
>  		dev_err(dev, "regulator node not found");
> -		return NULL;
> +		return ERR_PTR(-ENODATA);

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [RESUBMIT PATCH v3 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Tue, Oct 07, 2014 at 01:52:21PM +0100, Mark Brown wrote:
> On Tue, Oct 07, 2014 at 02:11:07PM +0900, Gyungoh Yoo wrote:
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Several problems here:
> 
>  - I don't have patches 1-6 or the cover letter for this series - what
>    are the dependencies?
>  - I can't see any sign that my concerns about the driver not actually
>    being reusable have been addressed here.
>  - This patch appears to do way more than add a compatible string, for
>    example:

I am sorry the recipients of each patch and cover letter was different.
I will resubmit soon.

> 
> > -	np = of_get_child_by_name(dev->parent->of_node, "regulator");
> > -	if (unlikely(!np)) {
> > +	if (!np) {
> >  		dev_err(dev, "regulator node not found");
> > -		return NULL;
> > +		return ERR_PTR(-ENODATA);

[RESUBMIT PATCH v3 8/8] devicetree: regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
index 882455e..7b9ff18 100644
--- a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -1,6 +1,7 @@
 SKY81452 voltage regulator
 
 Required properties:
+- compatible	: Must be "skyworks,sky81452-regulator"
 - any required generic properties defined in regulator.txt
 
 Optional properties:
@@ -9,6 +10,7 @@ Optional properties:
 Example:
 
 	regulator {
+		compatible = "skyworks,sky81452-regulator";
 		/* generic regulator properties */
 		regulator-name = "touch_en";
 		regulator-min-microvolt = <4500000>;
-- 
1.9.1

[RESUBMIT PATCH v4 0/8] Add Skyworks SKY81452 device drivers

[Gyungoh Yoo]

This patch set includes regulator and backlight driver for SKY81452.
Also it includes documents for device tree and module.
The initial version of sky81452-regulator was applied. Fo this, incremental
patches are included.

v4:
Removed MODULE_VERSION()
Modified license to GPLv2
Removed calling to backlight_device_unregister() in sky81452-backlight

v3:
Cleaned-up DBG messages
Cleaned-up DT
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages
Modified sky81452-regulator to return ENODATA when of_node is NULL

v2:
Split the patches for each sub-system
Added 'reg' attribute for I2C address in device tree documents
Added 'compatible' attribute in child drivers
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.
Added vendor prefix for Skyworks Solutions, Inc.
Add SKY81452 to the Trivial Devices list

Gyungoh Yoo (8):
  mfd: Add support for Skyworks SKY81452 driver
  backlight: Add support Skyworks SKY81452 backlight driver
  devicetree: mfd: Add new SKY81452 mfd binding
  devicetree: backlight: Add new SKY81452 backlight binding
  devicetree: Add vendor prefix for Skyworks Solutions, Inc.
  devicetree: i2c: Add SKY81452 to the Trivial Devices list
  regulator: sky81452: Add compatible string for device binding
  devicetree: regulator: sky81452: Add compatible string for device
    binding

 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt |  32 ++
 .../bindings/regulator/sky81452-regulator.txt      |   8 +
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../video/backlight/sky81452-backlight.txt         |  24 ++
 drivers/mfd/Kconfig                                |  12 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 110 +++++++
 drivers/regulator/Kconfig                          |   2 +-
 drivers/regulator/sky81452-regulator.c             |  23 +-
 drivers/video/backlight/Kconfig                    |  10 +
 drivers/video/backlight/Makefile                   |   1 +
 drivers/video/backlight/sky81452-backlight.c       | 344 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++
 include/linux/sky81452-backlight.h                 |  47 +++
 15 files changed, 640 insertions(+), 8 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/mfd/sky81452.h
 create mode 100644 include/linux/sky81452-backlight.h

-- 
1.9.1

[RESUBMIT PATCH v4 1/8] mfd: Add support for Skyworks SKY81452 driver

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages

Changes v2:
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors

 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 110 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 155 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index cf66ef1..f62a4a4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -641,6 +641,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index d58068a..2962396 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -170,6 +170,7 @@ obj-$(CONFIG_MFD_AS3722)	+= as3722.o
 obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
 obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..bdd3253
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,110 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize. err=%ld", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-backlight";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].of_compatible = "skyworks,sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (ret)
+		dev_err(dev, "failed to add child devices. err=%d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..142f762
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

Re: [RESUBMIT PATCH v4 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Mon, 13 Oct 2014, Gyungoh Yoo wrote:

> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v4:
> Removed MODULE_VERSION()
> Modified license to GPLv2
> 
> Changes v3:
> Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> Assigned mfd_cell.of_compatible for binding device node
> Modified error messages
> 
> Changes v2:
> Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> Added message for exception or errors
> 
>  drivers/mfd/Kconfig          |  12 +++++
>  drivers/mfd/Makefile         |   1 +
>  drivers/mfd/sky81452.c       | 110 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sky81452.h |  32 +++++++++++++
>  4 files changed, 155 insertions(+)
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h

[...]

> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include <linux/sky81452-backlight.h>

Shouldn't this live in linux/platform_data?

> +#include <linux/regulator/machine.h>
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v4 1/8] mfd: Add support for Skyworks SKY81452 driver

[Gyungoh Yoo]

On Tue, Oct 21, 2014 at 01:30:01PM +0100, Lee Jones wrote:
> On Mon, 13 Oct 2014, Gyungoh Yoo wrote:
> 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> > Changes v4:
> > Removed MODULE_VERSION()
> > Modified license to GPLv2
> > 
> > Changes v3:
> > Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> > Assigned mfd_cell.of_compatible for binding device node
> > Modified error messages
> > 
> > Changes v2:
> > Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> > Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> > Added message for exception or errors
> > 
> >  drivers/mfd/Kconfig          |  12 +++++
> >  drivers/mfd/Makefile         |   1 +
> >  drivers/mfd/sky81452.c       | 110 +++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/sky81452.h |  32 +++++++++++++
> >  4 files changed, 155 insertions(+)
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> 
> [...]
> 
> > +++ b/include/linux/mfd/sky81452.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * sky81452.h	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _SKY81452_H
> > +#define _SKY81452_H
> > +
> > +#include <linux/sky81452-backlight.h>
> 
> Shouldn't this live in linux/platform_data?

I will change the location to linux/platform_data and resubmit it.
Thank you your review.

> 
> > +#include <linux/regulator/machine.h>
> > +
> > +struct sky81452_platform_data {
> > +	struct sky81452_bl_platform_data *bl_pdata;
> > +	struct regulator_init_data *regulator_init_data;
> > +};
> > +
> > +#endif
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

[RESUBMIT PATCH v4 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Reordering header files for readability
Removed calling to backlight_device_unregister()
  - because devm_backlight_device_register() was used
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified DBG messages

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors

 drivers/video/backlight/Kconfig              |  10 +
 drivers/video/backlight/Makefile             |   1 +
 drivers/video/backlight/sky81452-backlight.c | 344 +++++++++++++++++++++++++++
 include/linux/sky81452-backlight.h           |  47 ++++
 4 files changed, 402 insertions(+)
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/sky81452-backlight.h

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..2586fdd 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
 	  If you have a Pandora console, say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_SKY81452
+	tristate "Backlight driver for SKY81452"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
+	help
+	  If you have a Skyworks SKY81452, say Y to enable the
+	  backlight driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called sky81452-backlight
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..d67073f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..3632e29
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,344 @@
+/*
+ * sky81452-backlight.c	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sky81452-backlight.h>
+#include <linux/slab.h>
+
+/* registers */
+#define SKY81452_REG0	0x00
+#define SKY81452_REG1	0x01
+#define SKY81452_REG2	0x02
+#define SKY81452_REG4	0x04
+#define SKY81452_REG5	0x05
+
+/* bit mask */
+#define SKY81452_CS	0xFF
+#define SKY81452_EN	0x3F
+#define SKY81452_IGPW	0x20
+#define SKY81452_PWMMD	0x10
+#define SKY81452_PHASE	0x08
+#define SKY81452_ILIM	0x04
+#define SKY81452_VSHRT	0x03
+#define SKY81452_OCP	0x80
+#define SKY81452_OTMP	0x40
+#define SKY81452_SHRT	0x3F
+#define SKY81452_OPN	0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
+
+#define CTZ(b) __builtin_ctz(b)
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+	const struct sky81452_bl_platform_data *pdata =
+			dev_get_platdata(bd->dev.parent);
+	const unsigned int brightness = (unsigned int)bd->props.brightness;
+	struct regmap *regmap = bl_get_data(bd);
+	int ret;
+
+	if (brightness > 0) {
+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+
+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					pdata->enable << CTZ(SKY81452_EN));
+	}
+
+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+	.update_status = sky81452_bl_update_status,
+	.get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					value << CTZ(SKY81452_EN));
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int reg, value = 0;
+	char tmp[3];
+	int i, ret;
+
+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+	ret = regmap_read(regmap, reg, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	if (value & SKY81452_SHRT) {
+		*buf = 0;
+		for (i = 0; i < 6; i++) {
+			if (value & 0x01) {
+				sprintf(tmp, "%d ", i + 1);
+				strcat(buf, tmp);
+			}
+			value >>= 1;
+		}
+		strcat(buf, "\n");
+	} else {
+		strcpy(buf, "none\n");
+	}
+
+	return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int value = 0;
+	int ret;
+
+	ret = regmap_read(regmap, SKY81452_REG4, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	*buf = 0;
+
+	if (value & SKY81452_OCP)
+		strcat(buf, "over-current ");
+
+	if (value & SKY81452_OTMP)
+		strcat(buf, "over-temperature");
+
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_open.attr,
+	&dev_attr_short.attr,
+	&dev_attr_fault.attr,
+	NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+	.attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	struct device_node *np = of_node_get(dev->of_node);
+	struct sky81452_bl_platform_data *pdata;
+	int ret;
+
+	if (!np) {
+		dev_err(dev, "backlight node not found");
+		return ERR_PTR(-ENODATA);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		of_node_put(np);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	of_property_read_string(np, "name", &pdata->name);
+	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+	if (IS_ERR_VALUE(pdata->gpio_enable))
+		pdata->gpio_enable = -1;
+
+	ret = of_property_read_u32(np, "enable", &pdata->enable);
+	if (IS_ERR_VALUE(ret))
+		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+	ret = of_property_read_u32(np, "short-detection-threshold",
+			&pdata->short_detection_threshold);
+	if (IS_ERR_VALUE(ret))
+		pdata->short_detection_threshold = 7;
+
+	ret = of_property_read_u32(np, "boost-current-limit",
+			&pdata->boost_current_limit);
+	if (IS_ERR_VALUE(ret))
+		pdata->boost_current_limit = 2750;
+
+	of_node_put(np);
+	return pdata;
+}
+#else
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *regmap,
+		struct sky81452_bl_platform_data *pdata)
+{
+	unsigned int value;
+
+	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+	if (pdata->boost_current_limit == 2300)
+		value |= SKY81452_ILIM;
+	else if (pdata->boost_current_limit != 2720)
+		return -EINVAL;
+
+	if (pdata->short_detection_threshold < 4 ||
+				pdata->short_detection_threshold > 7)
+		return -EINVAL;
+	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+	return regmap_write(regmap, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap = dev_get_drvdata(dev->parent);
+	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
+	struct backlight_device *bd;
+	struct backlight_properties props;
+	const char *name;
+	int ret;
+
+	if (!pdata) {
+		pdata = sky81452_bl_parse_dt(dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	if (pdata->gpio_enable >= 0) {
+		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+					GPIOF_OUT_INIT_HIGH, "sky81452-en");
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(dev, "failed to request GPIO. err=%d", ret);
+			return ret;
+		}
+	}
+
+	ret = sky81452_bl_init_device(regmap, pdata);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to initialize. err=%d", ret);
+		return ret;
+	}
+
+	memset(&props, 0, sizeof(props));
+	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+	bd = devm_backlight_device_register(dev, name, dev, regmap,
+						&sky81452_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd));
+		return PTR_ERR(bd);
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to create attribute. err=%d", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+	const struct sky81452_bl_platform_data *pdata =
+						dev_get_platdata(&pdev->dev);
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	if (pdata->gpio_enable >= 0)
+		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_bl_of_match[] = {
+	{ .compatible = "skyworks,sky81452-backlight", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
+#endif
+
+static struct platform_driver sky81452_bl_driver = {
+	.driver = {
+		.name = "sky81452-backlight",
+		.of_match_table = of_match_ptr(sky81452_bl_of_match),
+	},
+	.probe = sky81452_bl_probe,
+	.remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/sky81452-backlight.h b/include/linux/sky81452-backlight.h
new file mode 100644
index 0000000..b3635f9
--- /dev/null
+++ b/include/linux/sky81452-backlight.h
@@ -0,0 +1,47 @@
+/*
+ * sky81452.h	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_BACKLIGHT_H
+#define _SKY81452_BACKLIGHT_H
+
+/**
+ * struct sky81452_platform_data
+ * @name:	backlight driver name.
+		If it is not defined, default name is lcd-backlight.
+ * @gpio_enable:GPIO number which control EN pin
+ * @enable:	Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
+ * @ignore_pwm:	true if DPWMI should be ignored.
+ * @dpwm_mode:	true is DPWM dimming mode, otherwise Analog dimming mode.
+ * @phase_shift:true is phase shift mode.
+ * @short_detecion_threshold:	It should be one of 4, 5, 6 and 7V.
+ * @boost_current_limit:	It should be one of 2300, 2750mA.
+ */
+struct sky81452_bl_platform_data {
+	const char *name;
+	int gpio_enable;
+	unsigned int enable;
+	bool ignore_pwm;
+	bool dpwm_mode;
+	bool phase_shift;
+	unsigned int short_detection_threshold;
+	unsigned int boost_current_limit;
+};
+
+#endif
-- 
1.9.1

[RESUBMIT PATCH v4 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 Documentation/devicetree/bindings/mfd/sky81452.txt | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..d61904a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,32 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+- reg		: I2C slave address
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2c {
+		compatible = "skyworks,sky81452";
+		reg = <0x2c>;
+
+		backlight {
+			compatible = "skyworks,sky81452-backlight";
+			name = "pwm-backlight";
+			enable = <0x3F>;
+			ignore-pwm;
+		};
+
+		regulator {
+			compatible = "skyworks,sky81452-regulator";
+			regulator-name = "touch_en";
+			regulator-min-microvolt = <4500000>;
+			regulator-max-microvolt = <8000000>;
+		};
+	};
-- 
1.9.1

[RESUBMIT PATCH v4 4/8] devicetree: backlight: Add new SKY81452 backlight binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 .../video/backlight/sky81452-backlight.txt         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..2c2d947
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,24 @@
+SKY81452-backlight bindings
+
+Required properties:
+- compatible		: Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name			: Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable		: GPIO to use to EN pin.
+- enable		: Enable mask for current sink channel 1 to 6.
+- ignore-pwm		: Ignore both PWM input
+- dpwm-mode		: Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift		: Enable phase shift mode
+- ovp-level		: Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold	: It should be one of 4, 5, 6 and 7V.
+- boost-current-limit	: It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+	backlight {
+		compatible = "skyworks,sky81452-backlight";
+		name = "pwm-backlight";
+		enable = <0x3F>;
+		ignore-pwm;
+	};
-- 
1.9.1

[RESUBMIT PATCH v4 5/8] devicetree: Add vendor prefix for Skyworks Solutions, Inc.

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added vendor prefix for Skyworks Solutions, Inc.

 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index f67e3f8..534a583 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -136,6 +136,7 @@ sii	Seiko Instruments, Inc.
 silergy	Silergy Corp.
 sirf	SiRF Technology, Inc.
 sitronix	Sitronix Technology Corporation
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 solidrun	SolidRun
-- 
1.9.1

[RESUBMIT PATCH v4 6/8] devicetree: i2c: Add SKY81452 to the Trivial Devices list

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Add SKY81452 to the Trivial Devices list

 Documentation/devicetree/bindings/i2c/trivial-devices.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index 5af3d9d..2ed3baa 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -78,6 +78,7 @@ ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sii,s35390a		2-wire CMOS real-time clock
+skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
-- 
1.9.1

[RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified to return ENODATA when of_node is NULL
Modified the messages in error cases

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors.

 drivers/regulator/Kconfig              |  2 +-
 drivers/regulator/sky81452-regulator.c | 23 ++++++++++++++++-------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 55d7b7b..fe84bd4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -547,7 +547,7 @@ config REGULATOR_S5M8767
 
 config REGULATOR_SKY81452
 	tristate "Skyworks Solutions SKY81452 voltage regulator"
-	depends on SKY81452
+	depends on MFD_SKY81452
 	help
 	  This driver supports Skyworks SKY81452 voltage output regulator
 	  via I2C bus. SKY81452 has one voltage linear regulator can be
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
index 97aff0c..dfdefdb 100644
--- a/drivers/regulator/sky81452-regulator.c
+++ b/drivers/regulator/sky81452-regulator.c
@@ -68,12 +68,11 @@ static const struct regulator_desc sky81452_reg = {
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
 {
 	struct regulator_init_data *init_data;
-	struct device_node *np;
+	struct device_node *np = of_node_get(dev->of_node);
 
-	np = of_get_child_by_name(dev->parent->of_node, "regulator");
-	if (unlikely(!np)) {
+	if (!np) {
 		dev_err(dev, "regulator node not found");
-		return NULL;
+		return ERR_PTR(-ENODATA);
 	}
 
 	init_data = of_get_regulator_init_data(dev, np);
@@ -107,17 +106,28 @@ static int sky81452_reg_probe(struct platform_device *pdev)
 	config.regmap = dev_get_drvdata(dev->parent);
 
 	rdev = devm_regulator_register(dev, &sky81452_reg, &config);
-	if (IS_ERR(rdev))
+	if (IS_ERR(rdev)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(rdev));
 		return PTR_ERR(rdev);
+	}
 
 	platform_set_drvdata(pdev, rdev);
 
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_reg_of_match[] = {
+	{ .compatible = "skyworks,sky81452-regulator", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_reg_of_match);
+#endif
+
 static struct platform_driver sky81452_reg_driver = {
 	.driver = {
 		.name = "sky81452-regulator",
+		.of_match_table = of_match_ptr(sky81452_reg_of_match),
 	},
 	.probe = sky81452_reg_probe,
 };
@@ -126,5 +136,4 @@ module_platform_driver(sky81452_reg_driver);
 
 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
-MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 470 bytes --]

On Mon, Oct 13, 2014 at 02:47:41PM +0900, Gyungoh Yoo wrote:

> -	np = of_get_child_by_name(dev->parent->of_node, "regulator");
> -	if (unlikely(!np)) {
> +	if (!np) {
>  		dev_err(dev, "regulator node not found");
> -		return NULL;
> +		return ERR_PTR(-ENODATA);
>  	}

If you're doing anything here you should convert the code to use the
simplified interface for parsing regulator data based on putting the
subnode name and regualtor name in the regulator descriptor.

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Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Mon, Oct 13, 2014 at 12:35:12PM +0200, Mark Brown wrote:
> On Mon, Oct 13, 2014 at 02:47:41PM +0900, Gyungoh Yoo wrote:
> 
> > -	np = of_get_child_by_name(dev->parent->of_node, "regulator");
> > -	if (unlikely(!np)) {
> > +	if (!np) {
> >  		dev_err(dev, "regulator node not found");
> > -		return NULL;
> > +		return ERR_PTR(-ENODATA);
> >  	}
> 
> If you're doing anything here you should convert the code to use the
> simplified interface for parsing regulator data based on putting the
> subnode name and regualtor name in the regulator descriptor.

Thank you for the review.

The driver has of_device_id.

static const struct of_device_id sky81452_reg_of_match[] = {
        { .compatible = "skyworks,sky81452-regulator", },
        { }
};

And the MFD adds the driver with of_compatible="skyworks,sky81452-regulator".
MFD core maps the device node and the regulator driver does
not need to parse the subnode name.

Thanks.

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 860 bytes --]

On Tue, Oct 14, 2014 at 10:11:12AM +0900, Gyungoh Yoo wrote:
> On Mon, Oct 13, 2014 at 12:35:12PM +0200, Mark Brown wrote:

> > If you're doing anything here you should convert the code to use the
> > simplified interface for parsing regulator data based on putting the
> > subnode name and regualtor name in the regulator descriptor.

> Thank you for the review.

> The driver has of_device_id.

> static const struct of_device_id sky81452_reg_of_match[] = {
>         { .compatible = "skyworks,sky81452-regulator", },
>         { }
> };

> And the MFD adds the driver with of_compatible="skyworks,sky81452-regulator".
> MFD core maps the device node and the regulator driver does
> not need to parse the subnode name.

No, that's for the device (and as I say I don't think this is a good
idea).  I'm talking about the parsing of the constraints from the DT.

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Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Tue, Oct 14, 2014 at 09:56:06AM +0200, Mark Brown wrote:
> On Tue, Oct 14, 2014 at 10:11:12AM +0900, Gyungoh Yoo wrote:
> > On Mon, Oct 13, 2014 at 12:35:12PM +0200, Mark Brown wrote:
> 
> > > If you're doing anything here you should convert the code to use the
> > > simplified interface for parsing regulator data based on putting the
> > > subnode name and regualtor name in the regulator descriptor.
> 
> > Thank you for the review.
> 
> > The driver has of_device_id.
> 
> > static const struct of_device_id sky81452_reg_of_match[] = {
> >         { .compatible = "skyworks,sky81452-regulator", },
> >         { }
> > };
> 
> > And the MFD adds the driver with of_compatible="skyworks,sky81452-regulator".
> > MFD core maps the device node and the regulator driver does
> > not need to parse the subnode name.
> 
> No, that's for the device (and as I say I don't think this is a good
> idea).  I'm talking about the parsing of the constraints from the DT.

Wow. I understand.
I missed .supply_name. I think I need something like
below, before devm_regulator_register().

	config->supply_name = init_data->constraints.name;

I will resubmit it.
Thank you so much.

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 571 bytes --]

On Fri, Oct 17, 2014 at 06:19:50PM +0900, Gyungoh Yoo wrote:

> Wow. I understand.
> I missed .supply_name. I think I need something like
> below, before devm_regulator_register().

> 	config->supply_name = init_data->constraints.name;

> I will resubmit it.

No, not supply_name (though you really should be initializing that
anyway) and you definitely don't want to set supply_name to something
from constraints.  The supply_name should be the name of the input pin
that supplies power to the regulator.  I was referring to of_match and
regulators_node.

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Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Fri, Oct 17, 2014 at 12:17:34PM +0200, Mark Brown wrote:
> On Fri, Oct 17, 2014 at 06:19:50PM +0900, Gyungoh Yoo wrote:
> 
> > Wow. I understand.
> > I missed .supply_name. I think I need something like
> > below, before devm_regulator_register().
> 
> > 	config->supply_name = init_data->constraints.name;
> 
> > I will resubmit it.
> 
> No, not supply_name (though you really should be initializing that
> anyway) and you definitely don't want to set supply_name to something
> from constraints.  The supply_name should be the name of the input pin
> that supplies power to the regulator.  I was referring to of_match and
> regulators_node.

Wow. I had misunderstanding.

Are you talking about simplification using of_regulator_match()?
This driver has only one regulator.
Is the API also useful for this driver?
Like reg-fixed-voltage, how about using of_get_fixed_voltage_config()?

Thanks.

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 963 bytes --]

On Fri, Oct 17, 2014 at 07:43:09PM +0900, Gyungoh Yoo wrote:

> Are you talking about simplification using of_regulator_match()?
> This driver has only one regulator.
> Is the API also useful for this driver?

The thing I'm seeing is that the binding for your device with the
subnode looks very much like the device trees of devices with multiple
regulators.  The fact that you only have one regulator is a bit
difference but not that much.  It seems like drivers should fit into one
of two patterns: either the regulator is described in the root node for
the device for single purpose devices or there should be a collection of
regulators like is supported with this helper API.  Having a collection
with only one node doesn't seem to be a problem in any way.

> Like reg-fixed-voltage, how about using of_get_fixed_voltage_config()?

The driver doesn't seem to need any property parsing of its own so it
shoudn't need anything beyond basic calls into the core.

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Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Fri, Oct 17, 2014 at 04:26:05PM +0200, Mark Brown wrote:
> On Fri, Oct 17, 2014 at 07:43:09PM +0900, Gyungoh Yoo wrote:
> 
> > Are you talking about simplification using of_regulator_match()?
> > This driver has only one regulator.
> > Is the API also useful for this driver?
> 
> The thing I'm seeing is that the binding for your device with the
> subnode looks very much like the device trees of devices with multiple
> regulators.  The fact that you only have one regulator is a bit
> difference but not that much.  It seems like drivers should fit into one
> of two patterns: either the regulator is described in the root node for
> the device for single purpose devices or there should be a collection of
> regulators like is supported with this helper API.  Having a collection
> with only one node doesn't seem to be a problem in any way.
> 
> > Like reg-fixed-voltage, how about using of_get_fixed_voltage_config()?
> 
> The driver doesn't seem to need any property parsing of its own so it
> shoudn't need anything beyond basic calls into the core.

Thank you for your kind comments.
My understanding is getting better.

For my clear understanding:
I think the original designed which I wanted to design is similar
with arizona-ldo1.c
It seems that this is 1st pattern your explained above.
Can I ask what is different between arizona-ldo1.c and
this sky81452-regulator.c?
I think both are designed under root node.

Thank you.

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1421 bytes --]

On Mon, Oct 20, 2014 at 03:10:24PM +0900, Gyungoh Yoo wrote:
> On Fri, Oct 17, 2014 at 04:26:05PM +0200, Mark Brown wrote:

> > The thing I'm seeing is that the binding for your device with the
> > subnode looks very much like the device trees of devices with multiple
> > regulators.  The fact that you only have one regulator is a bit
> > difference but not that much.  It seems like drivers should fit into one
> > of two patterns: either the regulator is described in the root node for
> > the device for single purpose devices or there should be a collection of
> > regulators like is supported with this helper API.  Having a collection
> > with only one node doesn't seem to be a problem in any way.

> Thank you for your kind comments.
> My understanding is getting better.

> For my clear understanding:
> I think the original designed which I wanted to design is similar
> with arizona-ldo1.c
> It seems that this is 1st pattern your explained above.
> Can I ask what is different between arizona-ldo1.c and
> this sky81452-regulator.c?
> I think both are designed under root node.

Were that code being written today I'd probably be asking for it to use
a regulators subnode to be consistent with everything else, it's a
slightly older driver and sometimes we've not spotted the patterns when
they're added, once we get to the point of adding the helpers as we have
now things are definitely getting baked in.

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Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Wed, Oct 22, 2014 at 11:27:23AM +0100, Mark Brown wrote:
> On Mon, Oct 20, 2014 at 03:10:24PM +0900, Gyungoh Yoo wrote:
> > On Fri, Oct 17, 2014 at 04:26:05PM +0200, Mark Brown wrote:
> 
> > > The thing I'm seeing is that the binding for your device with the
> > > subnode looks very much like the device trees of devices with multiple
> > > regulators.  The fact that you only have one regulator is a bit
> > > difference but not that much.  It seems like drivers should fit into one
> > > of two patterns: either the regulator is described in the root node for
> > > the device for single purpose devices or there should be a collection of
> > > regulators like is supported with this helper API.  Having a collection
> > > with only one node doesn't seem to be a problem in any way.
> 
> > Thank you for your kind comments.
> > My understanding is getting better.
> 
> > For my clear understanding:
> > I think the original designed which I wanted to design is similar
> > with arizona-ldo1.c
> > It seems that this is 1st pattern your explained above.
> > Can I ask what is different between arizona-ldo1.c and
> > this sky81452-regulator.c?
> > I think both are designed under root node.
> 
> Were that code being written today I'd probably be asking for it to use
> a regulators subnode to be consistent with everything else, it's a
> slightly older driver and sometimes we've not spotted the patterns when
> they're added, once we get to the point of adding the helpers as we have
> now things are definitely getting baked in.

I see. Thank you.

So, what do you think about DT like below?

sky81452@2c {
	compatible = "skyworks,sky81452";
	reg = <0x2c>;

	backlight {
		compatible = "skyworks,sky81452-backlight";
		name = "pwm-backlight";
		enable = <0x3F>;
		ignore-pwm;
	};

	regulator {
		compatible = "skyworks,sky81452-regulator";

		lout@0 {
			regulator-name = "LOUT";
			regulator-min-microvolt = <4500000>;
			regulator-max-microvolt = <8000000>;
		};
	};
};

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 655 bytes --]

On Thu, Oct 23, 2014 at 12:14:43PM +0900, Gyungoh Yoo wrote:

> So, what do you think about DT like below?

> sky81452@2c {
> 	compatible = "skyworks,sky81452";
> 	reg = <0x2c>;
> 
> 	backlight {
> 		compatible = "skyworks,sky81452-backlight";
> 		name = "pwm-backlight";
> 		enable = <0x3F>;
> 		ignore-pwm;
> 	};
> 
> 	regulator {
> 		compatible = "skyworks,sky81452-regulator";

Yes, this is good but I still feel that the above compatible is
redundant and shouildn't be there.

> 		lout@0 {
> 			regulator-name = "LOUT";
> 			regulator-min-microvolt = <4500000>;
> 			regulator-max-microvolt = <8000000>;
> 		};
> 	};
> };

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Thu, Oct 23, 2014 at 02:01:03PM +0100, Mark Brown wrote:
> On Thu, Oct 23, 2014 at 12:14:43PM +0900, Gyungoh Yoo wrote:
> 
> > So, what do you think about DT like below?
> 
> > sky81452@2c {
> > 	compatible = "skyworks,sky81452";
> > 	reg = <0x2c>;
> > 
> > 	backlight {
> > 		compatible = "skyworks,sky81452-backlight";
> > 		name = "pwm-backlight";
> > 		enable = <0x3F>;
> > 		ignore-pwm;
> > 	};
> > 
> > 	regulator {
> > 		compatible = "skyworks,sky81452-regulator";
> 
> Yes, this is good but I still feel that the above compatible is
> redundant and shouildn't be there.

I see. I will remove compatible string at the next resubmit.

> 
> > 		lout@0 {
> > 			regulator-name = "LOUT";
> > 			regulator-min-microvolt = <4500000>;
> > 			regulator-max-microvolt = <8000000>;
> > 		};
> > 	};
> > };

[RESUBMIT PATCH v4 8/8] devicetree: regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added 'compatible' attribute in the driver

 Documentation/devicetree/bindings/regulator/sky81452-regulator.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
index 882455e..7b9ff18 100644
--- a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -1,6 +1,7 @@
 SKY81452 voltage regulator
 
 Required properties:
+- compatible	: Must be "skyworks,sky81452-regulator"
 - any required generic properties defined in regulator.txt
 
 Optional properties:
@@ -9,6 +10,7 @@ Optional properties:
 Example:
 
 	regulator {
+		compatible = "skyworks,sky81452-regulator";
 		/* generic regulator properties */
 		regulator-name = "touch_en";
 		regulator-min-microvolt = <4500000>;
-- 
1.9.1

[RESUBMIT PATCH v5 0/8] Add Skyworks SKY81452 device drivers

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

This patch set includes regulator and backlight driver for SKY81452.
Also it includes documents for device tree and module.
The initial version of sky81452-regulator was applied. Fo this, incremental
patches are included.

v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver
Modified sky81452-regulator to return EINVAL when of_node is NULL
Move sky81452-backlight.h to include/linux/platform_data

v4:
Removed MODULE_VERSION()
Modified license to GPLv2
Removed calling to backlight_device_unregister() in sky81452-backlight

v3:
Cleaned-up DBG messages
Cleaned-up DT
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages
Modified sky81452-regulator to return ENODATA when of_node is NULL

v2:
Split the patches for each sub-system
Added 'reg' attribute for I2C address in device tree documents
Added 'compatible' attribute in child drivers
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.
Added vendor prefix for Skyworks Solutions, Inc.
Add SKY81452 to the Trivial Devices list

Gyungoh Yoo (8):
  mfd: Add support for Skyworks SKY81452 driver
  backlight: Add support Skyworks SKY81452 backlight driver
  devicetree: mfd: Add new SKY81452 mfd binding
  devicetree: backlight: Add new SKY81452 backlight binding
  devicetree: Add vendor prefix for Skyworks Solutions, Inc.
  devicetree: i2c: Add SKY81452 to the Trivial Devices list
  regulator: sky81452: Add compatible string for device binding
  devicetree: regulator: sky81452: Add compatible string for device
    binding

 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt |  33 ++
 .../bindings/regulator/sky81452-regulator.txt      |  10 +-
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../video/backlight/sky81452-backlight.txt         |  24 ++
 drivers/mfd/Kconfig                                |  12 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 109 +++++++
 drivers/regulator/Kconfig                          |   2 +-
 drivers/regulator/sky81452-regulator.c             |  27 +-
 drivers/video/backlight/Kconfig                    |  10 +
 drivers/video/backlight/Makefile                   |   1 +
 drivers/video/backlight/sky81452-backlight.c       | 344 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++
 include/linux/platform_data/sky81452-backlight.h   |  47 +++
 15 files changed, 640 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/mfd/sky81452.h
 create mode 100644 include/linux/platform_data/sky81452-backlight.h

-- 
1.9.1

[RESUBMIT PATCH v5 1/8] mfd: Add support for Skyworks SKY81452 driver

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Move sky81452-backlight.h to include/linux/platform_data

Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages

Changes v2:
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors

 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 109 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 154 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1456ea7..a54244c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -693,6 +693,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8bd54b1..d9683ea 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -174,6 +174,7 @@ obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
 obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
 obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..a38061b
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,109 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize. err=%ld", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-backlight";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (ret)
+		dev_err(dev, "failed to add child devices. err=%d", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..9d84872
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/platform_data/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

[RESUBMIT PATCH v5 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Move sky81452-backlight.h to include/linux/platform_data

Changes v4:
Reordering header files for readability
Removed calling to backlight_device_unregister()
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified DBG messages

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors

 drivers/video/backlight/Kconfig                  |  10 +
 drivers/video/backlight/Makefile                 |   1 +
 drivers/video/backlight/sky81452-backlight.c     | 344 +++++++++++++++++++++++
 include/linux/platform_data/sky81452-backlight.h |  47 ++++
 4 files changed, 402 insertions(+)
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/platform_data/sky81452-backlight.h

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..2586fdd 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
 	  If you have a Pandora console, say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_SKY81452
+	tristate "Backlight driver for SKY81452"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
+	help
+	  If you have a Skyworks SKY81452, say Y to enable the
+	  backlight driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called sky81452-backlight
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..d67073f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..a677be6
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,344 @@
+/*
+ * sky81452-backlight.c	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/platform_data/sky81452-backlight.h>
+#include <linux/slab.h>
+
+/* registers */
+#define SKY81452_REG0	0x00
+#define SKY81452_REG1	0x01
+#define SKY81452_REG2	0x02
+#define SKY81452_REG4	0x04
+#define SKY81452_REG5	0x05
+
+/* bit mask */
+#define SKY81452_CS	0xFF
+#define SKY81452_EN	0x3F
+#define SKY81452_IGPW	0x20
+#define SKY81452_PWMMD	0x10
+#define SKY81452_PHASE	0x08
+#define SKY81452_ILIM	0x04
+#define SKY81452_VSHRT	0x03
+#define SKY81452_OCP	0x80
+#define SKY81452_OTMP	0x40
+#define SKY81452_SHRT	0x3F
+#define SKY81452_OPN	0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
+
+#define CTZ(b) __builtin_ctz(b)
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+	const struct sky81452_bl_platform_data *pdata =
+			dev_get_platdata(bd->dev.parent);
+	const unsigned int brightness = (unsigned int)bd->props.brightness;
+	struct regmap *regmap = bl_get_data(bd);
+	int ret;
+
+	if (brightness > 0) {
+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+
+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					pdata->enable << CTZ(SKY81452_EN));
+	}
+
+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+	.update_status = sky81452_bl_update_status,
+	.get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					value << CTZ(SKY81452_EN));
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int reg, value = 0;
+	char tmp[3];
+	int i, ret;
+
+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+	ret = regmap_read(regmap, reg, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	if (value & SKY81452_SHRT) {
+		*buf = 0;
+		for (i = 0; i < 6; i++) {
+			if (value & 0x01) {
+				sprintf(tmp, "%d ", i + 1);
+				strcat(buf, tmp);
+			}
+			value >>= 1;
+		}
+		strcat(buf, "\n");
+	} else {
+		strcpy(buf, "none\n");
+	}
+
+	return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int value = 0;
+	int ret;
+
+	ret = regmap_read(regmap, SKY81452_REG4, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	*buf = 0;
+
+	if (value & SKY81452_OCP)
+		strcat(buf, "over-current ");
+
+	if (value & SKY81452_OTMP)
+		strcat(buf, "over-temperature");
+
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_open.attr,
+	&dev_attr_short.attr,
+	&dev_attr_fault.attr,
+	NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+	.attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	struct device_node *np = of_node_get(dev->of_node);
+	struct sky81452_bl_platform_data *pdata;
+	int ret;
+
+	if (!np) {
+		dev_err(dev, "backlight node not found");
+		return ERR_PTR(-ENODATA);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		of_node_put(np);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	of_property_read_string(np, "name", &pdata->name);
+	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+	if (IS_ERR_VALUE(pdata->gpio_enable))
+		pdata->gpio_enable = -1;
+
+	ret = of_property_read_u32(np, "enable", &pdata->enable);
+	if (IS_ERR_VALUE(ret))
+		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+	ret = of_property_read_u32(np, "short-detection-threshold",
+			&pdata->short_detection_threshold);
+	if (IS_ERR_VALUE(ret))
+		pdata->short_detection_threshold = 7;
+
+	ret = of_property_read_u32(np, "boost-current-limit",
+			&pdata->boost_current_limit);
+	if (IS_ERR_VALUE(ret))
+		pdata->boost_current_limit = 2750;
+
+	of_node_put(np);
+	return pdata;
+}
+#else
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *regmap,
+		struct sky81452_bl_platform_data *pdata)
+{
+	unsigned int value;
+
+	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+	if (pdata->boost_current_limit == 2300)
+		value |= SKY81452_ILIM;
+	else if (pdata->boost_current_limit != 2720)
+		return -EINVAL;
+
+	if (pdata->short_detection_threshold < 4 ||
+				pdata->short_detection_threshold > 7)
+		return -EINVAL;
+	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+	return regmap_write(regmap, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap = dev_get_drvdata(dev->parent);
+	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
+	struct backlight_device *bd;
+	struct backlight_properties props;
+	const char *name;
+	int ret;
+
+	if (!pdata) {
+		pdata = sky81452_bl_parse_dt(dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	if (pdata->gpio_enable >= 0) {
+		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+					GPIOF_OUT_INIT_HIGH, "sky81452-en");
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(dev, "failed to request GPIO. err=%d", ret);
+			return ret;
+		}
+	}
+
+	ret = sky81452_bl_init_device(regmap, pdata);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to initialize. err=%d", ret);
+		return ret;
+	}
+
+	memset(&props, 0, sizeof(props));
+	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+	bd = devm_backlight_device_register(dev, name, dev, regmap,
+						&sky81452_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd));
+		return PTR_ERR(bd);
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to create attribute. err=%d", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+	const struct sky81452_bl_platform_data *pdata =
+						dev_get_platdata(&pdev->dev);
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	if (pdata->gpio_enable >= 0)
+		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_bl_of_match[] = {
+	{ .compatible = "skyworks,sky81452-backlight", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
+#endif
+
+static struct platform_driver sky81452_bl_driver = {
+	.driver = {
+		.name = "sky81452-backlight",
+		.of_match_table = of_match_ptr(sky81452_bl_of_match),
+	},
+	.probe = sky81452_bl_probe,
+	.remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/platform_data/sky81452-backlight.h b/include/linux/platform_data/sky81452-backlight.h
new file mode 100644
index 0000000..b3635f9
--- /dev/null
+++ b/include/linux/platform_data/sky81452-backlight.h
@@ -0,0 +1,47 @@
+/*
+ * sky81452.h	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_BACKLIGHT_H
+#define _SKY81452_BACKLIGHT_H
+
+/**
+ * struct sky81452_platform_data
+ * @name:	backlight driver name.
+		If it is not defined, default name is lcd-backlight.
+ * @gpio_enable:GPIO number which control EN pin
+ * @enable:	Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
+ * @ignore_pwm:	true if DPWMI should be ignored.
+ * @dpwm_mode:	true is DPWM dimming mode, otherwise Analog dimming mode.
+ * @phase_shift:true is phase shift mode.
+ * @short_detecion_threshold:	It should be one of 4, 5, 6 and 7V.
+ * @boost_current_limit:	It should be one of 2300, 2750mA.
+ */
+struct sky81452_bl_platform_data {
+	const char *name;
+	int gpio_enable;
+	unsigned int enable;
+	bool ignore_pwm;
+	bool dpwm_mode;
+	bool phase_shift;
+	unsigned int short_detection_threshold;
+	unsigned int boost_current_limit;
+};
+
+#endif
-- 
1.9.1

Re: [RESUBMIT PATCH v5 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Varka Bhadram]

On 10/27/2014 12:32 PM, gyungoh@gmail.com wrote:
> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
>
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v5:
> Move sky81452-backlight.h to include/linux/platform_data
>
> Changes v4:
> Reordering header files for readability
> Removed calling to backlight_device_unregister()
> Removed MODULE_VERSION()
> Modified license to GPLv2
>
> Changes v3:
> Modified DBG messages
>
> Changes v2:
> Added 'compatible' attribute in the driver
> Added message for exception or errors
>
>   drivers/video/backlight/Kconfig                  |  10 +
>   drivers/video/backlight/Makefile                 |   1 +
>   drivers/video/backlight/sky81452-backlight.c     | 344 +++++++++++++++++++++++
>   include/linux/platform_data/sky81452-backlight.h |  47 ++++
>   4 files changed, 402 insertions(+)
>   create mode 100644 drivers/video/backlight/sky81452-backlight.c
>   create mode 100644 include/linux/platform_data/sky81452-backlight.h
>
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 8d03924..2586fdd 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
>   	  If you have a Pandora console, say Y to enable the
>   	  backlight driver.
>   
> +config BACKLIGHT_SKY81452
> +	tristate "Backlight driver for SKY81452"
> +	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
> +	help
> +	  If you have a Skyworks SKY81452, say Y to enable the
> +	  backlight driver.
> +
> +	  To compile this driver as a module, choose M here: the module will
> +	  be called sky81452-backlight
> +
>   config BACKLIGHT_TPS65217
>   	tristate "TPS65217 Backlight"
>   	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index fcd50b73..d67073f 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
>   obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
>   obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
>   obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
> +obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
>   obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
>   obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
>   obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
> diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
> new file mode 100644
> index 0000000..a677be6
> --- /dev/null
> +++ b/drivers/video/backlight/sky81452-backlight.c
> @@ -0,0 +1,344 @@
> +/*
> + * sky81452-backlight.c	SKY81452 backlight driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/platform_data/sky81452-backlight.h>
> +#include <linux/slab.h>
> +
> +/* registers */
> +#define SKY81452_REG0	0x00
> +#define SKY81452_REG1	0x01
> +#define SKY81452_REG2	0x02
> +#define SKY81452_REG4	0x04
> +#define SKY81452_REG5	0x05
> +
> +/* bit mask */
> +#define SKY81452_CS	0xFF
> +#define SKY81452_EN	0x3F
> +#define SKY81452_IGPW	0x20
> +#define SKY81452_PWMMD	0x10
> +#define SKY81452_PHASE	0x08
> +#define SKY81452_ILIM	0x04
> +#define SKY81452_VSHRT	0x03
> +#define SKY81452_OCP	0x80
> +#define SKY81452_OTMP	0x40
> +#define SKY81452_SHRT	0x3F
> +#define SKY81452_OPN	0x3F
> +
> +#define SKY81452_DEFAULT_NAME "lcd-backlight"
> +#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
> +
> +#define CTZ(b) __builtin_ctz(b)
> +
> +static int sky81452_bl_update_status(struct backlight_device *bd)
> +{
> +	const struct sky81452_bl_platform_data *pdata =
> +			dev_get_platdata(bd->dev.parent);
> +	const unsigned int brightness = (unsigned int)bd->props.brightness;
> +	struct regmap *regmap = bl_get_data(bd);
> +	int ret;
> +
> +	if (brightness > 0) {
> +		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
> +		if (IS_ERR_VALUE(ret))
> +			return ret;
> +
> +		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> +					pdata->enable << CTZ(SKY81452_EN));
> +	}
> +
> +	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
> +}
> +
> +static int sky81452_bl_get_brightness(struct backlight_device *bd)
> +{
> +	return bd->props.brightness;
> +}
> +
> +static const struct backlight_ops sky81452_bl_ops = {
> +	.update_status = sky81452_bl_update_status,
> +	.get_brightness = sky81452_bl_get_brightness,
> +};
> +
> +static ssize_t sky81452_bl_store_enable(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t count)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned long value;
> +	int ret;
> +
> +	ret = kstrtoul(buf, 16, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> +					value << CTZ(SKY81452_EN));
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	return count;
> +}
> +
> +static ssize_t sky81452_bl_show_open_short(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned int reg, value = 0;
> +	char tmp[3];
> +	int i, ret;
> +
> +	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
> +	ret = regmap_read(regmap, reg, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	if (value & SKY81452_SHRT) {
> +		*buf = 0;
> +		for (i = 0; i < 6; i++) {
> +			if (value & 0x01) {
> +				sprintf(tmp, "%d ", i + 1);
> +				strcat(buf, tmp);
> +			}
> +			value >>= 1;
> +		}
> +		strcat(buf, "\n");
> +	} else {
> +		strcpy(buf, "none\n");
> +	}
> +
> +	return strlen(buf);
> +}
> +
> +static ssize_t sky81452_bl_show_fault(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> +	unsigned int value = 0;
> +	int ret;
> +
> +	ret = regmap_read(regmap, SKY81452_REG4, &value);
> +	if (IS_ERR_VALUE(ret))
> +		return ret;
> +
> +	*buf = 0;
> +
> +	if (value & SKY81452_OCP)
> +		strcat(buf, "over-current ");
> +
> +	if (value & SKY81452_OTMP)
> +		strcat(buf, "over-temperature");
> +
> +	strcat(buf, "\n");
> +	return strlen(buf);
> +}
> +
> +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
> +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
> +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
> +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
> +
> +static struct attribute *sky81452_bl_attribute[] = {
> +	&dev_attr_enable.attr,
> +	&dev_attr_open.attr,
> +	&dev_attr_short.attr,
> +	&dev_attr_fault.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group sky81452_bl_attr_group = {
> +	.attrs = sky81452_bl_attribute,
> +};
> +
> +#ifdef CONFIG_OF
> +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> +							struct device *dev)
> +{
> +	struct device_node *np = of_node_get(dev->of_node);
> +	struct sky81452_bl_platform_data *pdata;
> +	int ret;
> +
> +	if (!np) {
> +		dev_err(dev, "backlight node not found");

Missed terminating new line all over the driver for debug error messages..

-- 
Regards,
Varka Bhadram.

Re: [RESUBMIT PATCH v5 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Gyungoh Yoo]

On Mon, Oct 27, 2014 at 12:35:36PM +0530, Varka Bhadram wrote:
> On 10/27/2014 12:32 PM, gyungoh@gmail.com wrote:
> >From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> >
> >Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> >---
> >Changes v5:
> >Move sky81452-backlight.h to include/linux/platform_data
> >
> >Changes v4:
> >Reordering header files for readability
> >Removed calling to backlight_device_unregister()
> >Removed MODULE_VERSION()
> >Modified license to GPLv2
> >
> >Changes v3:
> >Modified DBG messages
> >
> >Changes v2:
> >Added 'compatible' attribute in the driver
> >Added message for exception or errors
> >
> >  drivers/video/backlight/Kconfig                  |  10 +
> >  drivers/video/backlight/Makefile                 |   1 +
> >  drivers/video/backlight/sky81452-backlight.c     | 344 +++++++++++++++++++++++
> >  include/linux/platform_data/sky81452-backlight.h |  47 ++++
> >  4 files changed, 402 insertions(+)
> >  create mode 100644 drivers/video/backlight/sky81452-backlight.c
> >  create mode 100644 include/linux/platform_data/sky81452-backlight.h
> >
> >diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> >index 8d03924..2586fdd 100644
> >--- a/drivers/video/backlight/Kconfig
> >+++ b/drivers/video/backlight/Kconfig
> >@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
> >  	  If you have a Pandora console, say Y to enable the
> >  	  backlight driver.
> >+config BACKLIGHT_SKY81452
> >+	tristate "Backlight driver for SKY81452"
> >+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
> >+	help
> >+	  If you have a Skyworks SKY81452, say Y to enable the
> >+	  backlight driver.
> >+
> >+	  To compile this driver as a module, choose M here: the module will
> >+	  be called sky81452-backlight
> >+
> >  config BACKLIGHT_TPS65217
> >  	tristate "TPS65217 Backlight"
> >  	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
> >diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> >index fcd50b73..d67073f 100644
> >--- a/drivers/video/backlight/Makefile
> >+++ b/drivers/video/backlight/Makefile
> >@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
> >  obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
> >  obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
> >  obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
> >+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
> >  obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
> >  obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
> >  obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
> >diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
> >new file mode 100644
> >index 0000000..a677be6
> >--- /dev/null
> >+++ b/drivers/video/backlight/sky81452-backlight.c
> >@@ -0,0 +1,344 @@
> >+/*
> >+ * sky81452-backlight.c	SKY81452 backlight driver
> >+ *
> >+ * Copyright 2014 Skyworks Solutions Inc.
> >+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> >+ *
> >+ * This program is free software; you can redistribute it and/or modify it
> >+ * under the terms of the GNU General Public License as published by the
> >+ * Free Software Foundation; either version 2, or (at your option) any
> >+ * later version.
> >+ *
> >+ * This program is distributed in the hope that it will be useful, but
> >+ * WITHOUT ANY WARRANTY; without even the implied warranty of
> >+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> >+ * General Public License for more details.
> >+ *
> >+ * You should have received a copy of the GNU General Public License along
> >+ * with this program; if not, see <http://www.gnu.org/licenses/>.
> >+ */
> >+
> >+#include <linux/backlight.h>
> >+#include <linux/err.h>
> >+#include <linux/gpio.h>
> >+#include <linux/init.h>
> >+#include <linux/kernel.h>
> >+#include <linux/module.h>
> >+#include <linux/of.h>
> >+#include <linux/of_gpio.h>
> >+#include <linux/platform_device.h>
> >+#include <linux/regmap.h>
> >+#include <linux/platform_data/sky81452-backlight.h>
> >+#include <linux/slab.h>
> >+
> >+/* registers */
> >+#define SKY81452_REG0	0x00
> >+#define SKY81452_REG1	0x01
> >+#define SKY81452_REG2	0x02
> >+#define SKY81452_REG4	0x04
> >+#define SKY81452_REG5	0x05
> >+
> >+/* bit mask */
> >+#define SKY81452_CS	0xFF
> >+#define SKY81452_EN	0x3F
> >+#define SKY81452_IGPW	0x20
> >+#define SKY81452_PWMMD	0x10
> >+#define SKY81452_PHASE	0x08
> >+#define SKY81452_ILIM	0x04
> >+#define SKY81452_VSHRT	0x03
> >+#define SKY81452_OCP	0x80
> >+#define SKY81452_OTMP	0x40
> >+#define SKY81452_SHRT	0x3F
> >+#define SKY81452_OPN	0x3F
> >+
> >+#define SKY81452_DEFAULT_NAME "lcd-backlight"
> >+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
> >+
> >+#define CTZ(b) __builtin_ctz(b)
> >+
> >+static int sky81452_bl_update_status(struct backlight_device *bd)
> >+{
> >+	const struct sky81452_bl_platform_data *pdata =
> >+			dev_get_platdata(bd->dev.parent);
> >+	const unsigned int brightness = (unsigned int)bd->props.brightness;
> >+	struct regmap *regmap = bl_get_data(bd);
> >+	int ret;
> >+
> >+	if (brightness > 0) {
> >+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
> >+		if (IS_ERR_VALUE(ret))
> >+			return ret;
> >+
> >+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> >+					pdata->enable << CTZ(SKY81452_EN));
> >+	}
> >+
> >+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
> >+}
> >+
> >+static int sky81452_bl_get_brightness(struct backlight_device *bd)
> >+{
> >+	return bd->props.brightness;
> >+}
> >+
> >+static const struct backlight_ops sky81452_bl_ops = {
> >+	.update_status = sky81452_bl_update_status,
> >+	.get_brightness = sky81452_bl_get_brightness,
> >+};
> >+
> >+static ssize_t sky81452_bl_store_enable(struct device *dev,
> >+		struct device_attribute *attr, const char *buf, size_t count)
> >+{
> >+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> >+	unsigned long value;
> >+	int ret;
> >+
> >+	ret = kstrtoul(buf, 16, &value);
> >+	if (IS_ERR_VALUE(ret))
> >+		return ret;
> >+
> >+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> >+					value << CTZ(SKY81452_EN));
> >+	if (IS_ERR_VALUE(ret))
> >+		return ret;
> >+
> >+	return count;
> >+}
> >+
> >+static ssize_t sky81452_bl_show_open_short(struct device *dev,
> >+		struct device_attribute *attr, char *buf)
> >+{
> >+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> >+	unsigned int reg, value = 0;
> >+	char tmp[3];
> >+	int i, ret;
> >+
> >+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
> >+	ret = regmap_read(regmap, reg, &value);
> >+	if (IS_ERR_VALUE(ret))
> >+		return ret;
> >+
> >+	if (value & SKY81452_SHRT) {
> >+		*buf = 0;
> >+		for (i = 0; i < 6; i++) {
> >+			if (value & 0x01) {
> >+				sprintf(tmp, "%d ", i + 1);
> >+				strcat(buf, tmp);
> >+			}
> >+			value >>= 1;
> >+		}
> >+		strcat(buf, "\n");
> >+	} else {
> >+		strcpy(buf, "none\n");
> >+	}
> >+
> >+	return strlen(buf);
> >+}
> >+
> >+static ssize_t sky81452_bl_show_fault(struct device *dev,
> >+		struct device_attribute *attr, char *buf)
> >+{
> >+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> >+	unsigned int value = 0;
> >+	int ret;
> >+
> >+	ret = regmap_read(regmap, SKY81452_REG4, &value);
> >+	if (IS_ERR_VALUE(ret))
> >+		return ret;
> >+
> >+	*buf = 0;
> >+
> >+	if (value & SKY81452_OCP)
> >+		strcat(buf, "over-current ");
> >+
> >+	if (value & SKY81452_OTMP)
> >+		strcat(buf, "over-temperature");
> >+
> >+	strcat(buf, "\n");
> >+	return strlen(buf);
> >+}
> >+
> >+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
> >+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
> >+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
> >+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
> >+
> >+static struct attribute *sky81452_bl_attribute[] = {
> >+	&dev_attr_enable.attr,
> >+	&dev_attr_open.attr,
> >+	&dev_attr_short.attr,
> >+	&dev_attr_fault.attr,
> >+	NULL
> >+};
> >+
> >+static const struct attribute_group sky81452_bl_attr_group = {
> >+	.attrs = sky81452_bl_attribute,
> >+};
> >+
> >+#ifdef CONFIG_OF
> >+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
> >+							struct device *dev)
> >+{
> >+	struct device_node *np = of_node_get(dev->of_node);
> >+	struct sky81452_bl_platform_data *pdata;
> >+	int ret;
> >+
> >+	if (!np) {
> >+		dev_err(dev, "backlight node not found");
> 
> Missed terminating new line all over the driver for debug error messages..
> 
> -- 
> Regards,
> Varka Bhadram.
> 

Oops. I missed them. I will re-submit.
Thank you for the comment.

[RESUBMIT PATCH v5 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 Documentation/devicetree/bindings/mfd/sky81452.txt | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..4b82a73
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,33 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+- reg		: I2C slave address
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2c {
+		compatible = "skyworks,sky81452";
+		reg = <0x2c>;
+
+		backlight {
+			compatible = "skyworks,sky81452-backlight";
+			name = "pwm-backlight";
+			enable = <0x3F>;
+			ignore-pwm;
+		};
+
+		regulator {
+			lout {
+				regulator-name = "sky81452-lout";
+				regulator-min-microvolt = <4500000>;
+				regulator-max-microvolt = <8000000>;
+			};
+		};
+	};
-- 
1.9.1

[RESUBMIT PATCH v5 4/8] devicetree: backlight: Add new SKY81452 backlight binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 .../video/backlight/sky81452-backlight.txt         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..2c2d947
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,24 @@
+SKY81452-backlight bindings
+
+Required properties:
+- compatible		: Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name			: Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable		: GPIO to use to EN pin.
+- enable		: Enable mask for current sink channel 1 to 6.
+- ignore-pwm		: Ignore both PWM input
+- dpwm-mode		: Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift		: Enable phase shift mode
+- ovp-level		: Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold	: It should be one of 4, 5, 6 and 7V.
+- boost-current-limit	: It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+	backlight {
+		compatible = "skyworks,sky81452-backlight";
+		name = "pwm-backlight";
+		enable = <0x3F>;
+		ignore-pwm;
+	};
-- 
1.9.1

[RESUBMIT PATCH v5 5/8] devicetree: Add vendor prefix for Skyworks Solutions, Inc.

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added vendor prefix for Skyworks Solutions, Inc.

 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 723999d..03e7730 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -137,6 +137,7 @@ sii	Seiko Instruments, Inc.
 silergy	Silergy Corp.
 sirf	SiRF Technology, Inc.
 sitronix	Sitronix Technology Corporation
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 solidrun	SolidRun
-- 
1.9.1

[RESUBMIT PATCH v5 6/8] devicetree: i2c: Add SKY81452 to the Trivial Devices list

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Add SKY81452 to the Trivial Devices list

 Documentation/devicetree/bindings/i2c/trivial-devices.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index fbde415..122fa1e 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -77,6 +77,7 @@ ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sii,s35390a		2-wire CMOS real-time clock
+skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
-- 
1.9.1

[RESUBMIT PATCH v5 7/8] regulator: sky81452: Add compatible string for device binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string
Modified to return EINVAL when of_node is NULL

Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified to return ENODATA when of_node is NULL
Modified the messages in error cases

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors.

 drivers/regulator/Kconfig              |  2 +-
 drivers/regulator/sky81452-regulator.c | 27 ++++++++++++++++++---------
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 55d7b7b..fe84bd4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -547,7 +547,7 @@ config REGULATOR_S5M8767
 
 config REGULATOR_SKY81452
 	tristate "Skyworks Solutions SKY81452 voltage regulator"
-	depends on SKY81452
+	depends on MFD_SKY81452
 	help
 	  This driver supports Skyworks SKY81452 voltage output regulator
 	  via I2C bus. SKY81452 has one voltage linear regulator can be
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
index 97aff0c..2066e0f 100644
--- a/drivers/regulator/sky81452-regulator.c
+++ b/drivers/regulator/sky81452-regulator.c
@@ -65,21 +65,29 @@ static const struct regulator_desc sky81452_reg = {
 };
 
 #ifdef CONFIG_OF
+static struct of_regulator_match sky81452_match = {
+	.name = "lout"
+};
+
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
 {
-	struct regulator_init_data *init_data;
 	struct device_node *np;
+	int ret;
 
 	np = of_get_child_by_name(dev->parent->of_node, "regulator");
-	if (unlikely(!np)) {
+	if (!np) {
 		dev_err(dev, "regulator node not found");
-		return NULL;
+		return ERR_PTR(-EINVAL);
 	}
 
-	init_data = of_get_regulator_init_data(dev, np);
-
+	ret = of_regulator_match(dev, np, &sky81452_match, 1);
 	of_node_put(np);
-	return init_data;
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "Error parsing regulator init data. err=%d", ret);
+		return ERR_PTR(ret);
+	}
+
+	return &sky81452_match.init_data;
 }
 #else
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
@@ -107,8 +115,10 @@ static int sky81452_reg_probe(struct platform_device *pdev)
 	config.regmap = dev_get_drvdata(dev->parent);
 
 	rdev = devm_regulator_register(dev, &sky81452_reg, &config);
-	if (IS_ERR(rdev))
+	if (IS_ERR(rdev)) {
+		dev_err(dev, "failed to register. err=%ld", PTR_ERR(rdev));
 		return PTR_ERR(rdev);
+	}
 
 	platform_set_drvdata(pdev, rdev);
 
@@ -126,5 +136,4 @@ module_platform_driver(sky81452_reg_driver);
 
 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
-MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

[RESUBMIT PATCH v5 8/8] devicetree: regulator: sky81452: Add compatible string for device binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added 'compatible' attribute in the driver

 .../devicetree/bindings/regulator/sky81452-regulator.txt       | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
index 882455e..f9acbc1 100644
--- a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -1,6 +1,7 @@
 SKY81452 voltage regulator
 
 Required properties:
+- regulator node named lout.
 - any required generic properties defined in regulator.txt
 
 Optional properties:
@@ -9,8 +10,9 @@ Optional properties:
 Example:
 
 	regulator {
-		/* generic regulator properties */
-		regulator-name = "touch_en";
-		regulator-min-microvolt = <4500000>;
-		regulator-max-microvolt = <8000000>;
+		lout {
+			regulator-name = "sky81452-lout";
+			regulator-min-microvolt = <4500000>;
+			regulator-max-microvolt = <8000000>;
+		};
 	};
-- 
1.9.1

[RESUBMIT PATCH v6 0/8] Add Skyworks SKY81452 device drivers

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

This patch set includes regulator and backlight driver for SKY81452.
Also it includes documents for device tree and module.
The initial version of sky81452-regulator was applied. Fo this, incremental
patches are included.

v6:
Added new line character at the end of line of dev_err()

v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver
Modified sky81452-regulator to return EINVAL when of_node is NULL
Move sky81452-backlight.h to include/linux/platform_data

v4:
Removed MODULE_VERSION()
Modified license to GPLv2
Removed calling to backlight_device_unregister() in sky81452-backlight

v3:
Cleaned-up DBG messages
Cleaned-up DT
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages
Modified sky81452-regulator to return ENODATA when of_node is NULL

v2:
Split the patches for each sub-system
Added 'reg' attribute for I2C address in device tree documents
Added 'compatible' attribute in child drivers
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors.
Added vendor prefix for Skyworks Solutions, Inc.
Add SKY81452 to the Trivial Devices list

Gyungoh Yoo (8):
  mfd: Add support for Skyworks SKY81452 driver
  backlight: Add support Skyworks SKY81452 backlight driver
  devicetree: mfd: Add new SKY81452 mfd binding
  devicetree: backlight: Add new SKY81452 backlight binding
  devicetree: Add vendor prefix for Skyworks Solutions, Inc.
  devicetree: i2c: Add SKY81452 to the Trivial Devices list
  regulator: sky81452: Add compatible string for device binding
  devicetree: regulator: sky81452: Add compatible string for device
    binding

 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 Documentation/devicetree/bindings/mfd/sky81452.txt |  33 ++
 .../bindings/regulator/sky81452-regulator.txt      |  10 +-
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../video/backlight/sky81452-backlight.txt         |  24 ++
 drivers/mfd/Kconfig                                |  12 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/sky81452.c                             | 109 +++++++
 drivers/regulator/Kconfig                          |   2 +-
 drivers/regulator/sky81452-regulator.c             |  29 +-
 drivers/video/backlight/Kconfig                    |  10 +
 drivers/video/backlight/Makefile                   |   1 +
 drivers/video/backlight/sky81452-backlight.c       | 345 +++++++++++++++++++++
 include/linux/mfd/sky81452.h                       |  32 ++
 include/linux/platform_data/sky81452-backlight.h   |  47 +++
 15 files changed, 642 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/mfd/sky81452.h
 create mode 100644 include/linux/platform_data/sky81452-backlight.h

-- 
1.9.1

[RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Added new line character at the end of line of dev_err()

Changes v5:
Move sky81452-backlight.h to include/linux/platform_data

Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
Assigned mfd_cell.of_compatible for binding device node
Modified error messages

Changes v2:
Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
Added message for exception or errors

 drivers/mfd/Kconfig          |  12 +++++
 drivers/mfd/Makefile         |   1 +
 drivers/mfd/sky81452.c       | 109 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sky81452.h |  32 +++++++++++++
 4 files changed, 154 insertions(+)
 create mode 100644 drivers/mfd/sky81452.c
 create mode 100644 include/linux/mfd/sky81452.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1456ea7..a54244c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -693,6 +693,18 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config MFD_SKY81452
+	tristate "Skyworks Solutions SKY81452"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  This is the core driver for the Skyworks SKY81452 backlight and
+	  voltage regulator device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8bd54b1..d9683ea 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -174,6 +174,7 @@ obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
 obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
 obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
 obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
+obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 0000000..ae1b584
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,109 @@
+/*
+ * sky81452.c	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+	struct mfd_cell cells[2];
+	struct regmap *regmap;
+	int ret;
+
+	if (!pdata) {
+		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &sky81452_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	memset(cells, 0, sizeof(cells));
+	cells[0].name = "sky81452-backlight";
+	cells[0].of_compatible = "skyworks,sky81452-backlight";
+	cells[0].platform_data = pdata->bl_pdata;
+	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+	cells[1].name = "sky81452-regulator";
+	cells[1].platform_data = pdata->regulator_init_data;
+	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+	if (ret)
+		dev_err(dev, "failed to add child devices. err=%d\n", ret);
+
+	return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+	mfd_remove_devices(&client->dev);
+	return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+	{ "sky81452" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+	{ .compatible = "skyworks,sky81452", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+	.driver = {
+		.name = "sky81452",
+		.of_match_table = of_match_ptr(sky81452_of_match),
+	},
+	.probe = sky81452_probe,
+	.remove = sky81452_remove,
+	.id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 0000000..9d84872
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,32 @@
+/*
+ * sky81452.h	SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/platform_data/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+	struct sky81452_bl_platform_data *bl_pdata;
+	struct regulator_init_data *regulator_init_data;
+};
+
+#endif
-- 
1.9.1

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:

> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v6:
> Added new line character at the end of line of dev_err()
> 
> Changes v5:
> Move sky81452-backlight.h to include/linux/platform_data
> 
> Changes v4:
> Removed MODULE_VERSION()
> Modified license to GPLv2
> 
> Changes v3:
> Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> Assigned mfd_cell.of_compatible for binding device node
> Modified error messages
> 
> Changes v2:
> Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> Added message for exception or errors
> 
>  drivers/mfd/Kconfig          |  12 +++++
>  drivers/mfd/Makefile         |   1 +
>  drivers/mfd/sky81452.c       | 109 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sky81452.h |  32 +++++++++++++
>  4 files changed, 154 insertions(+)
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h

Code looks fine, but what are its dependencies.  I'm assuming nothing;
however, did Mark say that something depends on it?  If so, what and
what are you going to do about it?

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 1456ea7..a54244c 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -693,6 +693,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config MFD_SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 8bd54b1..d9683ea 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -174,6 +174,7 @@ obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
>  obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
>  obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
> +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..ae1b584
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,109 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_probe(struct i2c_client *client,
> +				const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct mfd_cell cells[2];
> +	struct regmap *regmap;
> +	int ret;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
> +		return PTR_ERR(regmap);
> +	}
> +
> +	i2c_set_clientdata(client, regmap);
> +
> +	memset(cells, 0, sizeof(cells));
> +	cells[0].name = "sky81452-backlight";
> +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> +	cells[0].platform_data = pdata->bl_pdata;
> +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> +	cells[1].name = "sky81452-regulator";
> +	cells[1].platform_data = pdata->regulator_init_data;
> +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> +
> +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> +	if (ret)
> +		dev_err(dev, "failed to add child devices. err=%d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..9d84872
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include <linux/platform_data/sky81452-backlight.h>
> +#include <linux/regulator/machine.h>
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Paul Bolle]

On Mon, 2014-11-03 at 17:14 +0000, Lee Jones wrote:
>On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:
> Code looks fine, but what are its dependencies.  I'm assuming nothing;
> however, did Mark say that something depends on it?

That would be REGULATOR_SKY81452. That is currently dangling (since
v3.18-rc1) as it depends on the non-existent symbol SKY81452.

> If so, what and what are you going to do about it?

See 7/8. That patch makes REGULATOR_SKY81452 depend on MFD_SKY81452,
making it buildable.

> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 1456ea7..a54244c 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -693,6 +693,18 @@ config MFD_SM501_GPIO
> >  	 lines on the SM501. The platform data is used to supply the
> >  	 base number for the first GPIO line to register.
> >  
> > +config MFD_SKY81452
> > +	tristate "Skyworks Solutions SKY81452"
> > +	select MFD_CORE
> > +	select REGMAP_I2C
> > +	depends on I2C
> > +	help
> > +	  This is the core driver for the Skyworks SKY81452 backlight and
> > +	  voltage regulator device.
> > +
> > +	  This driver can also be built as a module.  If so, the module
> > +	  will be called sky81452.
> > +
> >  config MFD_SMSC
> >         bool "SMSC ECE1099 series chips"
> >         depends on I2C=y


Paul Bolle

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Mon, 03 Nov 2014, Paul Bolle wrote:

> On Mon, 2014-11-03 at 17:14 +0000, Lee Jones wrote:
> >On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:
> > Code looks fine, but what are its dependencies.  I'm assuming nothing;
> > however, did Mark say that something depends on it?
> 
> That would be REGULATOR_SKY81452. That is currently dangling (since
> v3.18-rc1) as it depends on the non-existent symbol SKY81452.
> 
> > If so, what and what are you going to do about it?
> 
> See 7/8. That patch makes REGULATOR_SKY81452 depend on MFD_SKY81452,
> making it buildable.

Okay, so I can take this patch with no fall-out then.

> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index 1456ea7..a54244c 100644
> > > --- a/drivers/mfd/Kconfig
> > > +++ b/drivers/mfd/Kconfig
> > > @@ -693,6 +693,18 @@ config MFD_SM501_GPIO
> > >  	 lines on the SM501. The platform data is used to supply the
> > >  	 base number for the first GPIO line to register.
> > >  
> > > +config MFD_SKY81452
> > > +	tristate "Skyworks Solutions SKY81452"
> > > +	select MFD_CORE
> > > +	select REGMAP_I2C
> > > +	depends on I2C
> > > +	help
> > > +	  This is the core driver for the Skyworks SKY81452 backlight and
> > > +	  voltage regulator device.
> > > +
> > > +	  This driver can also be built as a module.  If so, the module
> > > +	  will be called sky81452.
> > > +
> > >  config MFD_SMSC
> > >         bool "SMSC ECE1099 series chips"
> > >         depends on I2C=y
> 
> 
> Paul Bolle
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Paul Bolle]

On Mon, 2014-11-03 at 22:30 +0000, Lee Jones wrote:
> On Mon, 03 Nov 2014, Paul Bolle wrote:
> 
> > On Mon, 2014-11-03 at 17:14 +0000, Lee Jones wrote:
> > That patch makes REGULATOR_SKY81452 depend on MFD_SKY81452,
> > making it buildable.
> 
> Okay, so I can take this patch with no fall-out then.

Nothing will break. But I think Mark prefers the dependency rename, now
done in 7/8, to be done as part of this patch.


Paul Bolle

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Tue, 04 Nov 2014, Paul Bolle wrote:

> On Mon, 2014-11-03 at 22:30 +0000, Lee Jones wrote:
> > On Mon, 03 Nov 2014, Paul Bolle wrote:
> > 
> > > On Mon, 2014-11-03 at 17:14 +0000, Lee Jones wrote:
> > > That patch makes REGULATOR_SKY81452 depend on MFD_SKY81452,
> > > making it buildable.
> > 
> > Okay, so I can take this patch with no fall-out then.
> 
> Nothing will break. But I think Mark prefers the dependency rename, now
> done in 7/8, to be done as part of this patch.

I don't agree.  The rename should be taken independantly by Mark.
The regulator driver won't build until they match anyway, so there's
no hard dependency.  Unless someone can give me a really good reason
to revert it, I'm applying this driver now.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 583 bytes --]

On Tue, Nov 04, 2014 at 09:16:09AM +0000, Lee Jones wrote:
> On Tue, 04 Nov 2014, Paul Bolle wrote:

> > Nothing will break. But I think Mark prefers the dependency rename, now
> > done in 7/8, to be done as part of this patch.

> I don't agree.  The rename should be taken independantly by Mark.
> The regulator driver won't build until they match anyway, so there's
> no hard dependency.  Unless someone can give me a really good reason
> to revert it, I'm applying this driver now.

The important thing is that the dependency rename isn't silently thrown
into an unrelated patch.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Tue, 04 Nov 2014, Mark Brown wrote:

> On Tue, Nov 04, 2014 at 09:16:09AM +0000, Lee Jones wrote:
> > On Tue, 04 Nov 2014, Paul Bolle wrote:
> 
> > > Nothing will break. But I think Mark prefers the dependency rename, now
> > > done in 7/8, to be done as part of this patch.
> 
> > I don't agree.  The rename should be taken independantly by Mark.
> > The regulator driver won't build until they match anyway, so there's
> > no hard dependency.  Unless someone can give me a really good reason
> > to revert it, I'm applying this driver now.
> 
> The important thing is that the dependency rename isn't silently thrown
> into an unrelated patch.

That I agree with.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Mon, 03 Nov 2014, Lee Jones wrote:

> On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:
> 
> > From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > ---
> > Changes v6:
> > Added new line character at the end of line of dev_err()
> > 
> > Changes v5:
> > Move sky81452-backlight.h to include/linux/platform_data
> > 
> > Changes v4:
> > Removed MODULE_VERSION()
> > Modified license to GPLv2
> > 
> > Changes v3:
> > Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> > Assigned mfd_cell.of_compatible for binding device node
> > Modified error messages
> > 
> > Changes v2:
> > Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> > Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> > Added message for exception or errors
> > 
> >  drivers/mfd/Kconfig          |  12 +++++
> >  drivers/mfd/Makefile         |   1 +
> >  drivers/mfd/sky81452.c       | 109 +++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/sky81452.h |  32 +++++++++++++
> >  4 files changed, 154 insertions(+)
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> 
> Code looks fine, but what are its dependencies.  I'm assuming nothing;
> however, did Mark say that something depends on it?  If so, what and
> what are you going to do about it?

Okay, so this driver does in fact have a dependancy on the Backlight
driver.  Until I get a Backlight Ack from either Brian and/or Jingoo,
there is nothing I can do.

Patch unapplied.

> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 1456ea7..a54244c 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -693,6 +693,18 @@ config MFD_SM501_GPIO
> >  	 lines on the SM501. The platform data is used to supply the
> >  	 base number for the first GPIO line to register.
> >  
> > +config MFD_SKY81452
> > +	tristate "Skyworks Solutions SKY81452"
> > +	select MFD_CORE
> > +	select REGMAP_I2C
> > +	depends on I2C
> > +	help
> > +	  This is the core driver for the Skyworks SKY81452 backlight and
> > +	  voltage regulator device.
> > +
> > +	  This driver can also be built as a module.  If so, the module
> > +	  will be called sky81452.
> > +
> >  config MFD_SMSC
> >         bool "SMSC ECE1099 series chips"
> >         depends on I2C=y
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 8bd54b1..d9683ea 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -174,6 +174,7 @@ obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
> >  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> >  obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
> >  obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
> > +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
> >  
> >  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
> >  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> > diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> > new file mode 100644
> > index 0000000..ae1b584
> > --- /dev/null
> > +++ b/drivers/mfd/sky81452.c
> > @@ -0,0 +1,109 @@
> > +/*
> > + * sky81452.c	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/err.h>
> > +#include <linux/slab.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/mfd/sky81452.h>
> > +
> > +static const struct regmap_config sky81452_config = {
> > +	.reg_bits = 8,
> > +	.val_bits = 8,
> > +};
> > +
> > +static int sky81452_probe(struct i2c_client *client,
> > +				const struct i2c_device_id *id)
> > +{
> > +	struct device *dev = &client->dev;
> > +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> > +	struct mfd_cell cells[2];
> > +	struct regmap *regmap;
> > +	int ret;
> > +
> > +	if (!pdata) {
> > +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +		if (!pdata)
> > +			return -ENOMEM;
> > +	}
> > +
> > +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> > +	if (IS_ERR(regmap)) {
> > +		dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
> > +		return PTR_ERR(regmap);
> > +	}
> > +
> > +	i2c_set_clientdata(client, regmap);
> > +
> > +	memset(cells, 0, sizeof(cells));
> > +	cells[0].name = "sky81452-backlight";
> > +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> > +	cells[0].platform_data = pdata->bl_pdata;
> > +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> > +	cells[1].name = "sky81452-regulator";
> > +	cells[1].platform_data = pdata->regulator_init_data;
> > +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> > +
> > +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> > +	if (ret)
> > +		dev_err(dev, "failed to add child devices. err=%d\n", ret);
> > +
> > +	return ret;
> > +}
> > +
> > +static int sky81452_remove(struct i2c_client *client)
> > +{
> > +	mfd_remove_devices(&client->dev);
> > +	return 0;
> > +}
> > +
> > +static const struct i2c_device_id sky81452_ids[] = {
> > +	{ "sky81452" },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id sky81452_of_match[] = {
> > +	{ .compatible = "skyworks,sky81452", },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> > +#endif
> > +
> > +static struct i2c_driver sky81452_driver = {
> > +	.driver = {
> > +		.name = "sky81452",
> > +		.of_match_table = of_match_ptr(sky81452_of_match),
> > +	},
> > +	.probe = sky81452_probe,
> > +	.remove = sky81452_remove,
> > +	.id_table = sky81452_ids,
> > +};
> > +
> > +module_i2c_driver(sky81452_driver);
> > +
> > +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> > +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> > new file mode 100644
> > index 0000000..9d84872
> > --- /dev/null
> > +++ b/include/linux/mfd/sky81452.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * sky81452.h	SKY81452 MFD driver
> > + *
> > + * Copyright 2014 Skyworks Solutions Inc.
> > + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2, or (at your option) any
> > + * later version.
> > + *
> > + * This program is distributed in the hope that it will be useful, but
> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along
> > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _SKY81452_H
> > +#define _SKY81452_H
> > +
> > +#include <linux/platform_data/sky81452-backlight.h>
> > +#include <linux/regulator/machine.h>
> > +
> > +struct sky81452_platform_data {
> > +	struct sky81452_bl_platform_data *bl_pdata;
> > +	struct regulator_init_data *regulator_init_data;
> > +};
> > +
> > +#endif
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 1/8] mfd: Add support for Skyworks SKY81452 driver

[Lee Jones]

On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:

> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v6:
> Added new line character at the end of line of dev_err()
> 
> Changes v5:
> Move sky81452-backlight.h to include/linux/platform_data
> 
> Changes v4:
> Removed MODULE_VERSION()
> Modified license to GPLv2
> 
> Changes v3:
> Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> Assigned mfd_cell.of_compatible for binding device node
> Modified error messages
> 
> Changes v2:
> Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> Added message for exception or errors
> 
>  drivers/mfd/Kconfig          |  12 +++++
>  drivers/mfd/Makefile         |   1 +
>  drivers/mfd/sky81452.c       | 109 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sky81452.h |  32 +++++++++++++
>  4 files changed, 154 insertions(+)
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 include/linux/mfd/sky81452.h

Applied, thanks.

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 1456ea7..a54244c 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -693,6 +693,18 @@ config MFD_SM501_GPIO
>  	 lines on the SM501. The platform data is used to supply the
>  	 base number for the first GPIO line to register.
>  
> +config MFD_SKY81452
> +	tristate "Skyworks Solutions SKY81452"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  This is the core driver for the Skyworks SKY81452 backlight and
> +	  voltage regulator device.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called sky81452.
> +
>  config MFD_SMSC
>         bool "SMSC ECE1099 series chips"
>         depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 8bd54b1..d9683ea 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -174,6 +174,7 @@ obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
>  obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
>  obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
> +obj-$(CONFIG_MFD_SKY81452)		+= sky81452.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
> new file mode 100644
> index 0000000..ae1b584
> --- /dev/null
> +++ b/drivers/mfd/sky81452.c
> @@ -0,0 +1,109 @@
> +/*
> + * sky81452.c	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sky81452.h>
> +
> +static const struct regmap_config sky81452_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int sky81452_probe(struct i2c_client *client,
> +				const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
> +	struct mfd_cell cells[2];
> +	struct regmap *regmap;
> +	int ret;
> +
> +	if (!pdata) {
> +		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata)
> +			return -ENOMEM;
> +	}
> +
> +	regmap = devm_regmap_init_i2c(client, &sky81452_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
> +		return PTR_ERR(regmap);
> +	}
> +
> +	i2c_set_clientdata(client, regmap);
> +
> +	memset(cells, 0, sizeof(cells));
> +	cells[0].name = "sky81452-backlight";
> +	cells[0].of_compatible = "skyworks,sky81452-backlight";
> +	cells[0].platform_data = pdata->bl_pdata;
> +	cells[0].pdata_size = sizeof(*pdata->bl_pdata);
> +	cells[1].name = "sky81452-regulator";
> +	cells[1].platform_data = pdata->regulator_init_data;
> +	cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
> +
> +	ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
> +	if (ret)
> +		dev_err(dev, "failed to add child devices. err=%d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int sky81452_remove(struct i2c_client *client)
> +{
> +	mfd_remove_devices(&client->dev);
> +	return 0;
> +}
> +
> +static const struct i2c_device_id sky81452_ids[] = {
> +	{ "sky81452" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, sky81452_ids);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sky81452_of_match[] = {
> +	{ .compatible = "skyworks,sky81452", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sky81452_of_match);
> +#endif
> +
> +static struct i2c_driver sky81452_driver = {
> +	.driver = {
> +		.name = "sky81452",
> +		.of_match_table = of_match_ptr(sky81452_of_match),
> +	},
> +	.probe = sky81452_probe,
> +	.remove = sky81452_remove,
> +	.id_table = sky81452_ids,
> +};
> +
> +module_i2c_driver(sky81452_driver);
> +
> +MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
> +MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
> new file mode 100644
> index 0000000..9d84872
> --- /dev/null
> +++ b/include/linux/mfd/sky81452.h
> @@ -0,0 +1,32 @@
> +/*
> + * sky81452.h	SKY81452 MFD driver
> + *
> + * Copyright 2014 Skyworks Solutions Inc.
> + * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2, or (at your option) any
> + * later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _SKY81452_H
> +#define _SKY81452_H
> +
> +#include <linux/platform_data/sky81452-backlight.h>
> +#include <linux/regulator/machine.h>
> +
> +struct sky81452_platform_data {
> +	struct sky81452_bl_platform_data *bl_pdata;
> +	struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[RESUBMIT PATCH v6 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Added new line character at the end of line of dev_err()

Changes v5:
Move sky81452-backlight.h to include/linux/platform_data

Changes v4:
Reordering header files for readability
Removed calling to backlight_device_unregister()
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified DBG messages

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors

 drivers/video/backlight/Kconfig                  |  10 +
 drivers/video/backlight/Makefile                 |   1 +
 drivers/video/backlight/sky81452-backlight.c     | 345 +++++++++++++++++++++++
 include/linux/platform_data/sky81452-backlight.h |  47 +++
 4 files changed, 403 insertions(+)
 create mode 100644 drivers/video/backlight/sky81452-backlight.c
 create mode 100644 include/linux/platform_data/sky81452-backlight.h

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..2586fdd 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA
 	  If you have a Pandora console, say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_SKY81452
+	tristate "Backlight driver for SKY81452"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452
+	help
+	  If you have a Skyworks SKY81452, say Y to enable the
+	  backlight driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called sky81452-backlight
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..d67073f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
new file mode 100644
index 0000000..cec61e9
--- /dev/null
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -0,0 +1,345 @@
+/*
+ * sky81452-backlight.c	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/platform_data/sky81452-backlight.h>
+#include <linux/slab.h>
+
+/* registers */
+#define SKY81452_REG0	0x00
+#define SKY81452_REG1	0x01
+#define SKY81452_REG2	0x02
+#define SKY81452_REG4	0x04
+#define SKY81452_REG5	0x05
+
+/* bit mask */
+#define SKY81452_CS	0xFF
+#define SKY81452_EN	0x3F
+#define SKY81452_IGPW	0x20
+#define SKY81452_PWMMD	0x10
+#define SKY81452_PHASE	0x08
+#define SKY81452_ILIM	0x04
+#define SKY81452_VSHRT	0x03
+#define SKY81452_OCP	0x80
+#define SKY81452_OTMP	0x40
+#define SKY81452_SHRT	0x3F
+#define SKY81452_OPN	0x3F
+
+#define SKY81452_DEFAULT_NAME "lcd-backlight"
+#define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
+
+#define CTZ(b) __builtin_ctz(b)
+
+static int sky81452_bl_update_status(struct backlight_device *bd)
+{
+	const struct sky81452_bl_platform_data *pdata =
+			
+			dev_get_platdata(bd->dev.parent);
+	const unsigned int brightness = (unsigned int)bd->props.brightness;
+	struct regmap *regmap = bl_get_data(bd);
+	int ret;
+
+	if (brightness > 0) {
+		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+
+		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					pdata->enable << CTZ(SKY81452_EN));
+	}
+
+	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
+}
+
+static int sky81452_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static const struct backlight_ops sky81452_bl_ops = {
+	.update_status = sky81452_bl_update_status,
+	.get_brightness = sky81452_bl_get_brightness,
+};
+
+static ssize_t sky81452_bl_store_enable(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
+					value << CTZ(SKY81452_EN));
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	return count;
+}
+
+static ssize_t sky81452_bl_show_open_short(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int reg, value = 0;
+	char tmp[3];
+	int i, ret;
+
+	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
+	ret = regmap_read(regmap, reg, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	if (value & SKY81452_SHRT) {
+		*buf = 0;
+		for (i = 0; i < 6; i++) {
+			if (value & 0x01) {
+				sprintf(tmp, "%d ", i + 1);
+				strcat(buf, tmp);
+			}
+			value >>= 1;
+		}
+		strcat(buf, "\n");
+	} else {
+		strcpy(buf, "none\n");
+	}
+
+	return strlen(buf);
+}
+
+static ssize_t sky81452_bl_show_fault(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
+	unsigned int value = 0;
+	int ret;
+
+	ret = regmap_read(regmap, SKY81452_REG4, &value);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
+	*buf = 0;
+
+	if (value & SKY81452_OCP)
+		strcat(buf, "over-current ");
+
+	if (value & SKY81452_OTMP)
+		strcat(buf, "over-temperature");
+
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+
+static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
+static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
+static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
+
+static struct attribute *sky81452_bl_attribute[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_open.attr,
+	&dev_attr_short.attr,
+	&dev_attr_fault.attr,
+	NULL
+};
+
+static const struct attribute_group sky81452_bl_attr_group = {
+	.attrs = sky81452_bl_attribute,
+};
+
+#ifdef CONFIG_OF
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	struct device_node *np = of_node_get(dev->of_node);
+	struct sky81452_bl_platform_data *pdata;
+	int ret;
+
+	if (!np) {
+		dev_err(dev, "backlight node not found.\n");
+		return ERR_PTR(-ENODATA);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		of_node_put(np);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	of_property_read_string(np, "name", &pdata->name);
+	pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm");
+	pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode");
+	pdata->phase_shift = of_property_read_bool(np, "phase-shift");
+
+	pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0);
+	if (IS_ERR_VALUE(pdata->gpio_enable))
+		pdata->gpio_enable = -1;
+
+	ret = of_property_read_u32(np, "enable", &pdata->enable);
+	if (IS_ERR_VALUE(ret))
+		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
+
+	ret = of_property_read_u32(np, "short-detection-threshold",
+			&pdata->short_detection_threshold);
+	if (IS_ERR_VALUE(ret))
+		pdata->short_detection_threshold = 7;
+
+	ret = of_property_read_u32(np, "boost-current-limit",
+			&pdata->boost_current_limit);
+	if (IS_ERR_VALUE(ret))
+		pdata->boost_current_limit = 2750;
+
+	of_node_put(np);
+	return pdata;
+}
+#else
+static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
+							struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_bl_init_device(struct regmap *regmap,
+		struct sky81452_bl_platform_data *pdata)
+{
+	unsigned int value;
+
+	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
+	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
+	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
+
+	if (pdata->boost_current_limit == 2300)
+		value |= SKY81452_ILIM;
+	else if (pdata->boost_current_limit != 2720)
+		return -EINVAL;
+
+	if (pdata->short_detection_threshold < 4 ||
+				pdata->short_detection_threshold > 7)
+		return -EINVAL;
+	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
+
+	return regmap_write(regmap, SKY81452_REG2, value);
+}
+
+static int sky81452_bl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap = dev_get_drvdata(dev->parent);
+	struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev);
+	struct backlight_device *bd;
+	struct backlight_properties props;
+	const char *name;
+	int ret;
+
+	if (!pdata) {
+		pdata = sky81452_bl_parse_dt(dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	if (pdata->gpio_enable >= 0) {
+		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
+					GPIOF_OUT_INIT_HIGH, "sky81452-en");
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(dev, "failed to request GPIO. err=%d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = sky81452_bl_init_device(regmap, pdata);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to initialize. err=%d\n", ret);
+		return ret;
+	}
+
+	memset(&props, 0, sizeof(props));
+	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
+	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
+	bd = devm_backlight_device_register(dev, name, dev, regmap,
+						&sky81452_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(bd));
+		return PTR_ERR(bd);
+	}
+
+	platform_set_drvdata(pdev, bd);
+
+	ret  = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "failed to create attribute. err=%d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int sky81452_bl_remove(struct platform_device *pdev)
+{
+	const struct sky81452_bl_platform_data *pdata =
+						dev_get_platdata(&pdev->dev);
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	if (pdata->gpio_enable >= 0)
+		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_bl_of_match[] = {
+	{ .compatible = "skyworks,sky81452-backlight", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
+#endif
+
+static struct platform_driver sky81452_bl_driver = {
+	.driver = {
+		.name = "sky81452-backlight",
+		.of_match_table = of_match_ptr(sky81452_bl_of_match),
+	},
+	.probe = sky81452_bl_probe,
+	.remove = sky81452_bl_remove,
+};
+
+module_platform_driver(sky81452_bl_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/platform_data/sky81452-backlight.h b/include/linux/platform_data/sky81452-backlight.h
new file mode 100644
index 0000000..b3635f9
--- /dev/null
+++ b/include/linux/platform_data/sky81452-backlight.h
@@ -0,0 +1,47 @@
+/*
+ * sky81452.h	SKY81452 backlight driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_BACKLIGHT_H
+#define _SKY81452_BACKLIGHT_H
+
+/**
+ * struct sky81452_platform_data
+ * @name:	backlight driver name.
+		If it is not defined, default name is lcd-backlight.
+ * @gpio_enable:GPIO number which control EN pin
+ * @enable:	Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
+ * @ignore_pwm:	true if DPWMI should be ignored.
+ * @dpwm_mode:	true is DPWM dimming mode, otherwise Analog dimming mode.
+ * @phase_shift:true is phase shift mode.
+ * @short_detecion_threshold:	It should be one of 4, 5, 6 and 7V.
+ * @boost_current_limit:	It should be one of 2300, 2750mA.
+ */
+struct sky81452_bl_platform_data {
+	const char *name;
+	int gpio_enable;
+	unsigned int enable;
+	bool ignore_pwm;
+	bool dpwm_mode;
+	bool phase_shift;
+	unsigned int short_detection_threshold;
+	unsigned int boost_current_limit;
+};
+
+#endif
-- 
1.9.1

[RESUBMIT PATCH v6 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Nothing

Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 Documentation/devicetree/bindings/mfd/sky81452.txt | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
new file mode 100644
index 0000000..4b82a73
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
@@ -0,0 +1,33 @@
+SKY81452 bindings
+
+Required properties:
+- compatible	: Must be "skyworks,sky81452"
+- reg		: I2C slave address
+
+Required child nodes:
+- backlight	: container node for backlight following the binding
+		in video/backlight/sky81452-backlight.txt
+- regulator	: container node for regulators following the binding
+		in regulator/sky81452-regulator.txt
+
+Example:
+
+	sky81452@2c {
+		compatible = "skyworks,sky81452";
+		reg = <0x2c>;
+
+		backlight {
+			compatible = "skyworks,sky81452-backlight";
+			name = "pwm-backlight";
+			enable = <0x3F>;
+			ignore-pwm;
+		};
+
+		regulator {
+			lout {
+				regulator-name = "sky81452-lout";
+				regulator-min-microvolt = <4500000>;
+				regulator-max-microvolt = <8000000>;
+			};
+		};
+	};
-- 
1.9.1

Re: [RESUBMIT PATCH v6 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 224 bytes --]

On Fri, Oct 31, 2014 at 04:08:37PM +0900, gyungoh@gmail.com wrote:
> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Reviwed-by: Mark Brown <broonie@kernel.org>

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [RESUBMIT PATCH v6 3/8] devicetree: mfd: Add new SKY81452 mfd binding

[Lee Jones]

On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:

> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v6:
> Nothing
> 
> Changes v5:
> Changed DT for regulator : 'lout' node should be defined under 'regulator'
> Removed compatible string from sky81452-regulator driver
> 
> Changes v4:
> Nothing
> 
> Changes v3:
> Nothing
> 
> Changes v2:
> Added reg attribute for I2C slave address
> 
>  Documentation/devicetree/bindings/mfd/sky81452.txt | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt

For my own information:

  Acked-by: Lee Jones <lee.jones@linaro.org>

> diff --git a/Documentation/devicetree/bindings/mfd/sky81452.txt b/Documentation/devicetree/bindings/mfd/sky81452.txt
> new file mode 100644
> index 0000000..4b82a73
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/sky81452.txt
> @@ -0,0 +1,33 @@
> +SKY81452 bindings
> +
> +Required properties:
> +- compatible	: Must be "skyworks,sky81452"
> +- reg		: I2C slave address
> +
> +Required child nodes:
> +- backlight	: container node for backlight following the binding
> +		in video/backlight/sky81452-backlight.txt
> +- regulator	: container node for regulators following the binding
> +		in regulator/sky81452-regulator.txt
> +
> +Example:
> +
> +	sky81452@2c {
> +		compatible = "skyworks,sky81452";
> +		reg = <0x2c>;
> +
> +		backlight {
> +			compatible = "skyworks,sky81452-backlight";
> +			name = "pwm-backlight";
> +			enable = <0x3F>;
> +			ignore-pwm;
> +		};
> +
> +		regulator {
> +			lout {
> +				regulator-name = "sky81452-lout";
> +				regulator-min-microvolt = <4500000>;
> +				regulator-max-microvolt = <8000000>;
> +			};
> +		};
> +	};

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[RESUBMIT PATCH v6 4/8] devicetree: backlight: Add new SKY81452 backlight binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Nothing

Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added reg attribute for I2C slave address

 .../video/backlight/sky81452-backlight.txt         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..2c2d947
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
@@ -0,0 +1,24 @@
+SKY81452-backlight bindings
+
+Required properties:
+- compatible		: Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name			: Name of backlight device. Default is 'lcd-backlight'.
+- gpio-enable		: GPIO to use to EN pin.
+- enable		: Enable mask for current sink channel 1 to 6.
+- ignore-pwm		: Ignore both PWM input
+- dpwm-mode		: Enable DPWM dimming mode, otherwise Analog dimming mode
+- phase-shift		: Enable phase shift mode
+- ovp-level		: Over-voltage protection level. Should be between 14 or 28V.
+- short-detection-threshold	: It should be one of 4, 5, 6 and 7V.
+- boost-current-limit	: It should be one of 800, 1100 and 1500mA.
+
+Example:
+
+	backlight {
+		compatible = "skyworks,sky81452-backlight";
+		name = "pwm-backlight";
+		enable = <0x3F>;
+		ignore-pwm;
+	};
-- 
1.9.1

[RESUBMIT PATCH v6 5/8] devicetree: Add vendor prefix for Skyworks Solutions, Inc.

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Nothing

Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added vendor prefix for Skyworks Solutions, Inc.

 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 723999d..03e7730 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -137,6 +137,7 @@ sii	Seiko Instruments, Inc.
 silergy	Silergy Corp.
 sirf	SiRF Technology, Inc.
 sitronix	Sitronix Technology Corporation
+skyworks	Skyworks Solutions, Inc.
 smsc	Standard Microsystems Corporation
 snps 	Synopsys, Inc.
 solidrun	SolidRun
-- 
1.9.1

Re: [RESUBMIT PATCH v6 5/8] devicetree: Add vendor prefix for Skyworks Solutions, Inc.

[Lee Jones]

On Fri, 31 Oct 2014, gyungoh@gmail.com wrote:

> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> ---
> Changes v6:
> Nothing
> 
> Changes v5:
> Nothing
> 
> Changes v4:
> Nothing
> 
> Changes v3:
> Nothing
> 
> Changes v2:
> Added vendor prefix for Skyworks Solutions, Inc.
> 
>  Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
>  1 file changed, 1 insertion(+)

Acked-by: Lee Jones <lee.jones@linaro.org>

> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index 723999d..03e7730 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -137,6 +137,7 @@ sii	Seiko Instruments, Inc.
>  silergy	Silergy Corp.
>  sirf	SiRF Technology, Inc.
>  sitronix	Sitronix Technology Corporation
> +skyworks	Skyworks Solutions, Inc.
>  smsc	Standard Microsystems Corporation
>  snps 	Synopsys, Inc.
>  solidrun	SolidRun

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[RESUBMIT PATCH v6 6/8] devicetree: i2c: Add SKY81452 to the Trivial Devices list

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Nothing

Changes v5:
Nothing

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Add SKY81452 to the Trivial Devices list

 Documentation/devicetree/bindings/i2c/trivial-devices.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index fbde415..122fa1e 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -77,6 +77,7 @@ ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sii,s35390a		2-wire CMOS real-time clock
+skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
-- 
1.9.1

[RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Added new line character at the end of line of dev_err()

Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string
Modified to return EINVAL when of_node is NULL

Changes v4:
Removed MODULE_VERSION()
Modified license to GPLv2

Changes v3:
Modified to return ENODATA when of_node is NULL
Modified the messages in error cases

Changes v2:
Added 'compatible' attribute in the driver
Added message for exception or errors.

 drivers/regulator/Kconfig              |  2 +-
 drivers/regulator/sky81452-regulator.c | 29 +++++++++++++++++++----------
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 55d7b7b..fe84bd4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -547,7 +547,7 @@ config REGULATOR_S5M8767
 
 config REGULATOR_SKY81452
 	tristate "Skyworks Solutions SKY81452 voltage regulator"
-	depends on SKY81452
+	depends on MFD_SKY81452
 	help
 	  This driver supports Skyworks SKY81452 voltage output regulator
 	  via I2C bus. SKY81452 has one voltage linear regulator can be
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
index 97aff0c..23a3bd6 100644
--- a/drivers/regulator/sky81452-regulator.c
+++ b/drivers/regulator/sky81452-regulator.c
@@ -65,21 +65,29 @@ static const struct regulator_desc sky81452_reg = {
 };
 
 #ifdef CONFIG_OF
+static struct of_regulator_match sky81452_match = {
+	.name = "lout"
+};
+
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
 {
-	struct regulator_init_data *init_data;
 	struct device_node *np;
+	int ret;
 
 	np = of_get_child_by_name(dev->parent->of_node, "regulator");
-	if (unlikely(!np)) {
-		dev_err(dev, "regulator node not found");
-		return NULL;
+	if (!np) {
+		dev_err(dev, "regulator node not found.\n");
+		return ERR_PTR(-EINVAL);
 	}
 
-	init_data = of_get_regulator_init_data(dev, np);
-
+	ret = of_regulator_match(dev, np, &sky81452_match, 1);
 	of_node_put(np);
-	return init_data;
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(dev, "Error parsing init data. err=%d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	return &sky81452_match.init_data;
 }
 #else
 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
@@ -107,8 +115,10 @@ static int sky81452_reg_probe(struct platform_device *pdev)
 	config.regmap = dev_get_drvdata(dev->parent);
 
 	rdev = devm_regulator_register(dev, &sky81452_reg, &config);
-	if (IS_ERR(rdev))
+	if (IS_ERR(rdev)) {
+		dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(rdev));
 		return PTR_ERR(rdev);
+	}
 
 	platform_set_drvdata(pdev, rdev);
 
@@ -126,5 +136,4 @@ module_platform_driver(sky81452_reg_driver);
 
 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
-MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

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On Fri, Oct 31, 2014 at 04:08:41PM +0900, gyungoh@gmail.com wrote:
> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>

This doesn't apply against current code and depends on the MFD symbol
rename - can you please check what's going on here?

It would make sense to split the Kconfig symbol rename into a separate
patch to ease merging, it doesn't seem obviously related to the driver
change and should probably be in the same patch as the MFD symbol rename
for bisetion.

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Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Paul Bolle]

On Fri, 2014-10-31 at 16:44 +0000, Mark Brown wrote:
> On Fri, Oct 31, 2014 at 04:08:41PM +0900, gyungoh@gmail.com wrote:
> > From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> This doesn't apply against current code and depends on the MFD symbol
> rename - can you please check what's going on here?
> 
> It would make sense to split the Kconfig symbol rename into a separate
> patch to ease merging,

The relicensing (from GPL to GPL v2, thus dropping the "or later"
provision) is odd too. The header still uses GPL v2 or later, doesn't
it? Anyhow, that could be a separate patch too.

> it doesn't seem obviously related to the driver
> change and should probably be in the same patch as the MFD symbol rename
> for bisetion.

I don't think there will be bisection problems (in mainline). Currently
this driver depends on SKY81452. But that symbol doesn't exist. Only
after both 1/8 and this patch will this driver become buildable, for the
first time. So it's not that this driver was buildable, became
unbuildable in 1/8 and buildable again in this patch.

(I don't think it's much of a problem that the regulator driver got
merged, in v3.18-rc1, before the mfd driver on which it depends.
Avoiding that temporarily problem appears to be more trouble than it's
worth.)


Paul Bolle

Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1042 bytes --]

On Mon, Nov 03, 2014 at 10:45:39PM +0100, Paul Bolle wrote:
> On Fri, 2014-10-31 at 16:44 +0000, Mark Brown wrote:

> > it doesn't seem obviously related to the driver
> > change and should probably be in the same patch as the MFD symbol rename
> > for bisetion.

> I don't think there will be bisection problems (in mainline). Currently
> this driver depends on SKY81452. But that symbol doesn't exist. Only
> after both 1/8 and this patch will this driver become buildable, for the
> first time. So it's not that this driver was buildable, became
> unbuildable in 1/8 and buildable again in this patch.

> (I don't think it's much of a problem that the regulator driver got
> merged, in v3.18-rc1, before the mfd driver on which it depends.
> Avoiding that temporarily problem appears to be more trouble than it's
> worth.)

The symbol rename should not be randomly shoved in with another patch,
and if the MFD still hasn't been merged then it probably makes sense to
do the rename as part of merging the MFD so it's clear what's going on.

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Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Mon, Nov 03, 2014 at 10:45:39PM +0100, Paul Bolle wrote:
> On Fri, 2014-10-31 at 16:44 +0000, Mark Brown wrote:
> > On Fri, Oct 31, 2014 at 04:08:41PM +0900, gyungoh@gmail.com wrote:
> > > From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > > 
> > > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > 
> > This doesn't apply against current code and depends on the MFD symbol
> > rename - can you please check what's going on here?
> > 
> > It would make sense to split the Kconfig symbol rename into a separate
> > patch to ease merging,
> 
> The relicensing (from GPL to GPL v2, thus dropping the "or later"
> provision) is odd too. The header still uses GPL v2 or later, doesn't
> it? Anyhow, that could be a separate patch too.

I will modify the licensing text and resubmit it.
Thank you for your comment.

> 
> > it doesn't seem obviously related to the driver
> > change and should probably be in the same patch as the MFD symbol rename
> > for bisetion.
> 
> I don't think there will be bisection problems (in mainline). Currently
> this driver depends on SKY81452. But that symbol doesn't exist. Only
> after both 1/8 and this patch will this driver become buildable, for the
> first time. So it's not that this driver was buildable, became
> unbuildable in 1/8 and buildable again in this patch.
> 
> (I don't think it's much of a problem that the regulator driver got
> merged, in v3.18-rc1, before the mfd driver on which it depends.
> Avoiding that temporarily problem appears to be more trouble than it's
> worth.)
> 
> 
> Paul Bolle
> 

Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Fri, Oct 31, 2014 at 04:44:18PM +0000, Mark Brown wrote:
> On Fri, Oct 31, 2014 at 04:08:41PM +0900, gyungoh@gmail.com wrote:
> > From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > 
> > Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> This doesn't apply against current code and depends on the MFD symbol
> rename - can you please check what's going on here?

Are you talking about 'sky81452-regulator'?
I am sorry I don't understand. Can you explain in more detail?

> 
> It would make sense to split the Kconfig symbol rename into a separate
> patch to ease merging, it doesn't seem obviously related to the driver
> change and should probably be in the same patch as the MFD symbol rename
> for bisetion.

becuase the symbol in the modfied MFD does not match with the
merged regulator driver, it was hard to split the patch.

Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 892 bytes --]

On Tue, Nov 04, 2014 at 09:43:34AM +0900, Gyungoh Yoo wrote:
> On Fri, Oct 31, 2014 at 04:44:18PM +0000, Mark Brown wrote:

> > This doesn't apply against current code and depends on the MFD symbol
> > rename - can you please check what's going on here?

> Are you talking about 'sky81452-regulator'?
> I am sorry I don't understand. Can you explain in more detail?

No, I mean the Kconfig change.

> > It would make sense to split the Kconfig symbol rename into a separate
> > patch to ease merging, it doesn't seem obviously related to the driver
> > change and should probably be in the same patch as the MFD symbol rename
> > for bisetion.

> becuase the symbol in the modfied MFD does not match with the
> merged regulator driver, it was hard to split the patch.

I'm having a hard time understanding why it is difficult to split the
two changes - they are in completely separate files.

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Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Tue, Nov 04, 2014 at 12:53:29AM +0000, Mark Brown wrote:
> On Tue, Nov 04, 2014 at 09:43:34AM +0900, Gyungoh Yoo wrote:
> > On Fri, Oct 31, 2014 at 04:44:18PM +0000, Mark Brown wrote:
> 
> > > This doesn't apply against current code and depends on the MFD symbol
> > > rename - can you please check what's going on here?
> 
> > Are you talking about 'sky81452-regulator'?
> > I am sorry I don't understand. Can you explain in more detail?
> 
> No, I mean the Kconfig change.
> 
> > > It would make sense to split the Kconfig symbol rename into a separate
> > > patch to ease merging, it doesn't seem obviously related to the driver
> > > change and should probably be in the same patch as the MFD symbol rename
> > > for bisetion.
> 
> > becuase the symbol in the modfied MFD does not match with the
> > merged regulator driver, it was hard to split the patch.
> 
> I'm having a hard time understanding why it is difficult to split the
> two changes - they are in completely separate files.

I am sorry for the hard time.

That was because the symbol changes had a dependency with 1/8.
In this case, Should Kconfig symbol change back from MFD_SKY81452
to SKY81452 in this patch series? And then should I submit to change to MFD_SKY81452
with seperate patch?

Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Mark Brown]

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On Tue, Nov 04, 2014 at 02:45:34PM +0900, Gyungoh Yoo wrote:
> On Tue, Nov 04, 2014 at 12:53:29AM +0000, Mark Brown wrote:

> > I'm having a hard time understanding why it is difficult to split the
> > two changes - they are in completely separate files.

> I am sorry for the hard time.

> That was because the symbol changes had a dependency with 1/8.
> In this case, Should Kconfig symbol change back from MFD_SKY81452
> to SKY81452 in this patch series? And then should I submit to change to MFD_SKY81452
> with seperate patch?

No, what I'm saying is that if you want to rename the Kconfig symbol you
should do that as part of a separate patch to changing the DT stuff.

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Re: [RESUBMIT PATCH v6 7/8] regulator: sky81452: Add compatible string for device binding

[Gyungoh Yoo]

On Tue, Nov 04, 2014 at 11:41:20AM +0000, Mark Brown wrote:
> On Tue, Nov 04, 2014 at 02:45:34PM +0900, Gyungoh Yoo wrote:
> > On Tue, Nov 04, 2014 at 12:53:29AM +0000, Mark Brown wrote:
> 
> > > I'm having a hard time understanding why it is difficult to split the
> > > two changes - they are in completely separate files.
> 
> > I am sorry for the hard time.
> 
> > That was because the symbol changes had a dependency with 1/8.
> > In this case, Should Kconfig symbol change back from MFD_SKY81452
> > to SKY81452 in this patch series? And then should I submit to change to MFD_SKY81452
> > with seperate patch?
> 
> No, what I'm saying is that if you want to rename the Kconfig symbol you
> should do that as part of a separate patch to changing the DT stuff.

I see.
I will split this patch. One is for DT stuff and the other is for Kconfig
symbol rename.
Thank you for your comment.

[RESUBMIT PATCH v6 8/8] devicetree: regulator: sky81452: Add compatible string for device binding

[gyungoh]

From: Gyungoh Yoo <jack.yoo@skyworksinc.com>

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
---
Changes v6:
Nothing

Changes v5:
Changed DT for regulator : 'lout' node should be defined under 'regulator'
Removed compatible string from sky81452-regulator driver

Changes v4:
Nothing

Changes v3:
Nothing

Changes v2:
Added 'compatible' attribute in the driver

 .../devicetree/bindings/regulator/sky81452-regulator.txt       | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
index 882455e..f9acbc1 100644
--- a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -1,6 +1,7 @@
 SKY81452 voltage regulator
 
 Required properties:
+- regulator node named lout.
 - any required generic properties defined in regulator.txt
 
 Optional properties:
@@ -9,8 +10,9 @@ Optional properties:
 Example:
 
 	regulator {
-		/* generic regulator properties */
-		regulator-name = "touch_en";
-		regulator-min-microvolt = <4500000>;
-		regulator-max-microvolt = <8000000>;
+		lout {
+			regulator-name = "sky81452-lout";
+			regulator-min-microvolt = <4500000>;
+			regulator-max-microvolt = <8000000>;
+		};
 	};
-- 
1.9.1

Re: [RESUBMIT PATCH v6 0/8] Add Skyworks SKY81452 device drivers

[Lee Jones]

Gyungoh,

You are still missing Acks for this set.  Can you please send it again
with the Acks that you have collected thus far.

Please do not send it in reply-to these others.  I would suggest never
sending out the set again in reply-to a previous version, as things
get confusing real quick.

> From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> 
> This patch set includes regulator and backlight driver for SKY81452.
> Also it includes documents for device tree and module.
> The initial version of sky81452-regulator was applied. Fo this, incremental
> patches are included.
> 
> v6:
> Added new line character at the end of line of dev_err()
> 
> v5:
> Changed DT for regulator : 'lout' node should be defined under 'regulator'
> Removed compatible string from sky81452-regulator driver
> Modified sky81452-regulator to return EINVAL when of_node is NULL
> Move sky81452-backlight.h to include/linux/platform_data
> 
> v4:
> Removed MODULE_VERSION()
> Modified license to GPLv2
> Removed calling to backlight_device_unregister() in sky81452-backlight
> 
> v3:
> Cleaned-up DBG messages
> Cleaned-up DT
> Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> Assigned mfd_cell.of_compatible for binding device node
> Modified error messages
> Modified sky81452-regulator to return ENODATA when of_node is NULL
> 
> v2:
> Split the patches for each sub-system
> Added 'reg' attribute for I2C address in device tree documents
> Added 'compatible' attribute in child drivers
> Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> Added message for exception or errors.
> Added vendor prefix for Skyworks Solutions, Inc.
> Add SKY81452 to the Trivial Devices list
> 
> Gyungoh Yoo (8):
>   mfd: Add support for Skyworks SKY81452 driver
>   backlight: Add support Skyworks SKY81452 backlight driver
>   devicetree: mfd: Add new SKY81452 mfd binding
>   devicetree: backlight: Add new SKY81452 backlight binding
>   devicetree: Add vendor prefix for Skyworks Solutions, Inc.
>   devicetree: i2c: Add SKY81452 to the Trivial Devices list
>   regulator: sky81452: Add compatible string for device binding
>   devicetree: regulator: sky81452: Add compatible string for device
>     binding
> 
>  .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
>  Documentation/devicetree/bindings/mfd/sky81452.txt |  33 ++
>  .../bindings/regulator/sky81452-regulator.txt      |  10 +-
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  .../video/backlight/sky81452-backlight.txt         |  24 ++
>  drivers/mfd/Kconfig                                |  12 +
>  drivers/mfd/Makefile                               |   1 +
>  drivers/mfd/sky81452.c                             | 109 +++++++
>  drivers/regulator/Kconfig                          |   2 +-
>  drivers/regulator/sky81452-regulator.c             |  29 +-
>  drivers/video/backlight/Kconfig                    |  10 +
>  drivers/video/backlight/Makefile                   |   1 +
>  drivers/video/backlight/sky81452-backlight.c       | 345 +++++++++++++++++++++
>  include/linux/mfd/sky81452.h                       |  32 ++
>  include/linux/platform_data/sky81452-backlight.h   |  47 +++
>  15 files changed, 642 insertions(+), 15 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
>  create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
>  create mode 100644 drivers/mfd/sky81452.c
>  create mode 100644 drivers/video/backlight/sky81452-backlight.c
>  create mode 100644 include/linux/mfd/sky81452.h
>  create mode 100644 include/linux/platform_data/sky81452-backlight.h
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [RESUBMIT PATCH v6 0/8] Add Skyworks SKY81452 device drivers

[Gyungoh Yoo]

On Tue, Nov 11, 2014 at 11:10:37AM +0000, Lee Jones wrote:
> Gyungoh,
> 
> You are still missing Acks for this set.  Can you please send it again
> with the Acks that you have collected thus far.
> 
> Please do not send it in reply-to these others.  I would suggest never
> sending out the set again in reply-to a previous version, as things
> get confusing real quick.

I see. I didn't know that reply-to makes a confusing.
I will resubmit the patch series.

Thank you

> 
> > From: Gyungoh Yoo <jack.yoo@skyworksinc.com>
> > 
> > This patch set includes regulator and backlight driver for SKY81452.
> > Also it includes documents for device tree and module.
> > The initial version of sky81452-regulator was applied. Fo this, incremental
> > patches are included.
> > 
> > v6:
> > Added new line character at the end of line of dev_err()
> > 
> > v5:
> > Changed DT for regulator : 'lout' node should be defined under 'regulator'
> > Removed compatible string from sky81452-regulator driver
> > Modified sky81452-regulator to return EINVAL when of_node is NULL
> > Move sky81452-backlight.h to include/linux/platform_data
> > 
> > v4:
> > Removed MODULE_VERSION()
> > Modified license to GPLv2
> > Removed calling to backlight_device_unregister() in sky81452-backlight
> > 
> > v3:
> > Cleaned-up DBG messages
> > Cleaned-up DT
> > Fixed the backlight name from 'sky81452-bl' to 'sky81452-backlight'
> > Assigned mfd_cell.of_compatible for binding device node
> > Modified error messages
> > Modified sky81452-regulator to return ENODATA when of_node is NULL
> > 
> > v2:
> > Split the patches for each sub-system
> > Added 'reg' attribute for I2C address in device tree documents
> > Added 'compatible' attribute in child drivers
> > Renamed CONFIG_SKY81452 to CONFIG_MFD_SKY81452
> > Changed the dependency from I2C=y to I2C, for CONFIG_MFD_SKY81452
> > Added message for exception or errors.
> > Added vendor prefix for Skyworks Solutions, Inc.
> > Add SKY81452 to the Trivial Devices list
> > 
> > Gyungoh Yoo (8):
> >   mfd: Add support for Skyworks SKY81452 driver
> >   backlight: Add support Skyworks SKY81452 backlight driver
> >   devicetree: mfd: Add new SKY81452 mfd binding
> >   devicetree: backlight: Add new SKY81452 backlight binding
> >   devicetree: Add vendor prefix for Skyworks Solutions, Inc.
> >   devicetree: i2c: Add SKY81452 to the Trivial Devices list
> >   regulator: sky81452: Add compatible string for device binding
> >   devicetree: regulator: sky81452: Add compatible string for device
> >     binding
> > 
> >  .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
> >  Documentation/devicetree/bindings/mfd/sky81452.txt |  33 ++
> >  .../bindings/regulator/sky81452-regulator.txt      |  10 +-
> >  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
> >  .../video/backlight/sky81452-backlight.txt         |  24 ++
> >  drivers/mfd/Kconfig                                |  12 +
> >  drivers/mfd/Makefile                               |   1 +
> >  drivers/mfd/sky81452.c                             | 109 +++++++
> >  drivers/regulator/Kconfig                          |   2 +-
> >  drivers/regulator/sky81452-regulator.c             |  29 +-
> >  drivers/video/backlight/Kconfig                    |  10 +
> >  drivers/video/backlight/Makefile                   |   1 +
> >  drivers/video/backlight/sky81452-backlight.c       | 345 +++++++++++++++++++++
> >  include/linux/mfd/sky81452.h                       |  32 ++
> >  include/linux/platform_data/sky81452-backlight.h   |  47 +++
> >  15 files changed, 642 insertions(+), 15 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/sky81452.txt
> >  create mode 100644 Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
> >  create mode 100644 drivers/mfd/sky81452.c
> >  create mode 100644 drivers/video/backlight/sky81452-backlight.c
> >  create mode 100644 include/linux/mfd/sky81452.h
> >  create mode 100644 include/linux/platform_data/sky81452-backlight.h
> > 
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog