[PATCH v5 0/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[PATCH v5 0/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Wenyou Yang]

This patch set adds support for the Active-semi ACT8945A PMIC
MFD driver. It is a Multi Function Device with the following
subdevices:
 - Regulator
 - Charger

It is interfaced to the host controller using I2C interface,
ACT8945A is a child device of the I2C.

Changes in v5:
 - change depends on to 'I2C=y'.

Changes in v4:
 - add a space before .compatible.
 - collect Reviewed-by from Krzysztof Kozlowski.

Changes in v3:
 - fix the tabbing errors in Example.
 - use "pmic@5b" label, not "act8945a@5b" in Example.
 - collect Acked-by from Rob.

Changes in v2:
 - add more help information in Kconfig.
 - update the file header with short version license and author line.
 - remove unused structure members (dev, i2c_client) of stuct act8945a_dev.
 - use define "PLATFORM_DEVID_NONE" for mfd_add_devices(), instead of '-1'.
 - use more explicit info to indicate the failure to add sub devices.
 - remove the unnecessary print out.
 - substitute MODULE_LICENSE("GPL") for MODULE_LICENSE("GPL v2").
 - use more specific label in Example.
 - add pmic and charger nodes in Example.

Wenyou Yang (2):
  mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver
  mfd: add documentation for ACT8945A DT bindings

 Documentation/devicetree/bindings/mfd/act8945a.txt |   82 +++++++++++++++
 drivers/mfd/Kconfig                                |   11 ++
 drivers/mfd/Makefile                               |    1 +
 drivers/mfd/act8945a.c                             |  109 ++++++++++++++++++++
 include/linux/mfd/act8945a.h                       |   21 ++++
 5 files changed, 224 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/act8945a.txt
 create mode 100644 drivers/mfd/act8945a.c
 create mode 100644 include/linux/mfd/act8945a.h

-- 
1.7.9.5

[PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Wenyou Yang]

This patch adds support for the Active-semi ACT8945A PMIC.
It is a Multi Function Device with the following subdevices:
 - Regulator
 - Charger

It is interfaced to the host controller using I2C interface,
ACT8945A is a child device of the I2C.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---

Changes in v5:
 - change depends on to 'I2C=y'.

Changes in v4:
 - add a space before .compatible.
 - collect Reviewed-by from Krzysztof Kozlowski.

Changes in v3: None
Changes in v2:
 - add more help information in Kconfig.
 - update the file header with short version license and author line.
 - remove unused structure members (dev, i2c_client) of stuct act8945a_dev.
 - use define "PLATFORM_DEVID_NONE" for mfd_add_devices(), instead of '-1'.
 - use more explicit info to indicate the failure to add sub devices.
 - remove the unnecessary print out.
 - substitute MODULE_LICENSE("GPL") for MODULE_LICENSE("GPL v2").

 drivers/mfd/Kconfig          |   11 +++++
 drivers/mfd/Makefile         |    1 +
 drivers/mfd/act8945a.c       |  109 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/act8945a.h |   21 ++++++++
 4 files changed, 142 insertions(+)
 create mode 100644 drivers/mfd/act8945a.c
 create mode 100644 include/linux/mfd/act8945a.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9ca66de..cd8762a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -18,6 +18,17 @@ config MFD_CS5535
 	  This is the core driver for CS5535/CS5536 MFD functions.  This is
           necessary for using the board's GPIO and MFGPT functionality.
 
+config MFD_ACT8945A
+	bool "Active-semi ACT8945A"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C=y && OF
+	help
+	  Support for the ACT8945A PMIC from Active-semi. This device
+	  features three step-down DC/DC converters and four low-dropout
+	  linear regulators, along with a complete ActivePath battery
+	  charger.
+
 config MFD_AS3711
 	bool "AMS AS3711"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0f230a6..2f1ca82 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -6,6 +6,7 @@
 obj-$(CONFIG_MFD_88PM860X)	+= 88pm860x.o
 obj-$(CONFIG_MFD_88PM800)	+= 88pm800.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM805)	+= 88pm805.o 88pm80x.o
+obj-$(CONFIG_MFD_ACT8945A)	+= act8945a.o
 obj-$(CONFIG_MFD_SM501)		+= sm501.o
 obj-$(CONFIG_MFD_ASIC3)		+= asic3.o tmio_core.o
 obj-$(CONFIG_MFD_BCM590XX)	+= bcm590xx.o
diff --git a/drivers/mfd/act8945a.c b/drivers/mfd/act8945a.c
new file mode 100644
index 0000000..f5745b1
--- /dev/null
+++ b/drivers/mfd/act8945a.c
@@ -0,0 +1,109 @@
+/*
+ * MFD driver for Active-semi ACT8945a PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation.
+ *
+ * Author: Wenyou Yang <wenyou.yang@atmel.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 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/i2c.h>
+#include <linux/mfd/act8945a.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell act8945a_devs[] = {
+	{
+		.name = "act8945a-pmic",
+		.of_compatible = "active-semi,act8945a-regulator",
+	},
+	{
+		.name = "act8945a-charger",
+		.of_compatible = "active-semi,act8945a-charger",
+	},
+};
+
+static const struct regmap_config act8945a_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int act8945a_i2c_probe(struct i2c_client *i2c,
+			      const struct i2c_device_id *id)
+{
+	struct act8945a_dev *act8945a;
+	int ret;
+
+	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a), GFP_KERNEL);
+	if (!act8945a)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, act8945a);
+
+	act8945a->regmap = devm_regmap_init_i2c(i2c, &act8945a_regmap_config);
+	if (IS_ERR(act8945a->regmap)) {
+		ret = PTR_ERR(act8945a->regmap);
+		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, act8945a_devs,
+			      ARRAY_SIZE(act8945a_devs), NULL, 0, NULL);
+	if (ret) {
+		dev_err(&i2c->dev, "Failed to add sub devices\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int act8945a_i2c_remove(struct i2c_client *i2c)
+{
+	mfd_remove_devices(&i2c->dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id act8945a_i2c_id[] = {
+	{ "act8945a", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, act8945a_i2c_id);
+
+static const struct of_device_id act8945a_of_match[] = {
+	{ .compatible = "active-semi,act8945a", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, act8945a_of_match);
+
+static struct i2c_driver act8945a_i2c_driver = {
+	.driver = {
+		   .name = "act8945a",
+		   .of_match_table = of_match_ptr(act8945a_of_match),
+	},
+	.probe = act8945a_i2c_probe,
+	.remove = act8945a_i2c_remove,
+	.id_table = act8945a_i2c_id,
+};
+
+static int __init act8945a_i2c_init(void)
+{
+	return i2c_add_driver(&act8945a_i2c_driver);
+}
+subsys_initcall(act8945a_i2c_init);
+
+static void __exit act8945a_i2c_exit(void)
+{
+	i2c_del_driver(&act8945a_i2c_driver);
+}
+module_exit(act8945a_i2c_exit);
+
+MODULE_DESCRIPTION("ACT8945A PMIC multi-function driver");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/act8945a.h b/include/linux/mfd/act8945a.h
new file mode 100644
index 0000000..5f67009
--- /dev/null
+++ b/include/linux/mfd/act8945a.h
@@ -0,0 +1,21 @@
+/*
+ * MFD driver for Active-semi ACT8945a PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation.
+ *
+ * Author: Wenyou Yang <wenyou.yang@atmel.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 of the License, or (at your
+ * option) any later version.
+ */
+
+#ifndef _LINUX_MFD_ACT8945A_H
+#define _LINUX_MFD_ACT8945A_H
+
+struct act8945a_dev {
+	struct regmap *regmap;
+};
+
+#endif
-- 
1.7.9.5

[PATCH v5 2/2] mfd: add documentation for ACT8945A DT bindings

[Wenyou Yang]

The Active-semi ACT8945A PMIC is a Multi-Function Device, it has
two subdevices:
 - Regulator
 - Charger

This patch adds documentation for ACT8945A DT bindings.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Rob Herring <robh@kernel.org>
---

Changes in v5: None
Changes in v4: None
Changes in v3:
 - fix the tabbing errors in Example.
 - use "pmic@5b" label, not "act8945a@5b" in Example.
 - collect Acked-by from Rob.

Changes in v2:
 - use more specific label in Example.
 - add pmic and charger nodes in Example.

 Documentation/devicetree/bindings/mfd/act8945a.txt |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/act8945a.txt

diff --git a/Documentation/devicetree/bindings/mfd/act8945a.txt b/Documentation/devicetree/bindings/mfd/act8945a.txt
new file mode 100644
index 0000000..f645344
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/act8945a.txt
@@ -0,0 +1,82 @@
+Device-Tree bindings for Active-semi ACT8945A MFD driver
+
+Required properties:
+ - compatible: "active-semi,act8945a".
+ - reg: the I2C slave address for the ACT8945A chip
+
+The chip exposes two subdevices:
+ - a regulators: see ../regulator/act8945a-regulator.txt
+ - a charger: see ../power/act8945a-charger.txt
+
+Example:
+	pmic@5b {
+		compatible = "active-semi,act8945a";
+		reg = <0x5b>;
+		status = "okay";
+
+		pmic {
+			compatible = "active-semi,act8945a-regulator";
+			active-semi,vsel-high;
+
+			regulators {
+				vdd_1v35_reg: DCDC_REG1 {
+					regulator-name = "VDD_1V35";
+					regulator-min-microvolt = <1350000>;
+					regulator-max-microvolt = <1350000>;
+					regulator-always-on;
+				};
+
+				vdd_1v2_reg: DCDC_REG2 {
+					regulator-name = "VDD_1V2";
+					regulator-min-microvolt = <1100000>;
+					regulator-max-microvolt = <1300000>;
+					regulator-always-on;
+				};
+
+				vdd_3v3_reg: DCDC_REG3 {
+					regulator-name = "VDD_3V3";
+					regulator-min-microvolt = <3300000>;
+					regulator-max-microvolt = <3300000>;
+					regulator-always-on;
+				};
+
+				vdd_fuse_reg: LDO_REG1 {
+					regulator-name = "VDD_FUSE";
+					regulator-min-microvolt = <2500000>;
+					regulator-max-microvolt = <2500000>;
+					regulator-always-on;
+				};
+
+				vdd_3v3_lp_reg: LDO_REG2 {
+					regulator-name = "VDD_3V3_LP";
+					regulator-min-microvolt = <3300000>;
+					regulator-max-microvolt = <3300000>;
+					regulator-always-on;
+				};
+
+				vdd_led_reg: LDO_REG3 {
+					regulator-name = "VDD_LED";
+					regulator-min-microvolt = <3300000>;
+					regulator-max-microvolt = <3300000>;
+					regulator-always-on;
+				};
+
+				vdd_sdhc_1v8_reg: LDO_REG4 {
+					regulator-name = "VDD_SDHC_1V8";
+					regulator-min-microvolt = <1800000>;
+					regulator-max-microvolt = <1800000>;
+					regulator-always-on;
+				};
+			};
+		};
+
+		charger {
+			compatible = "active-semi,act8945a-charger";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_charger_chglev>;
+			active-semi,chglev-gpio = <&pioA 12 GPIO_ACTIVE_HIGH>;
+			active-semi,input_voltage_threshold = <6600>;
+			active-semi,precondition_timeout = <40>;
+			active-semi,total_timeout = <3>;
+		};
+	};
-- 
1.7.9.5

Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Peter Korsgaard]

>>>>> "Wenyou" == Wenyou Yang <wenyou.yang@atmel.com> writes:

 > This patch adds support for the Active-semi ACT8945A PMIC.
 > It is a Multi Function Device with the following subdevices:
 >  - Regulator
 >  - Charger

 > It is interfaced to the host controller using I2C interface,
 > ACT8945A is a child device of the I2C.

 > Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
 > Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
 > ---

 > Changes in v5:
 >  - change depends on to 'I2C=y'.

Why not make it a tristate instead? Having regulators as modules is
perhaps not a very wise thing to do, but conceptually I don't see why
this code couldn't be a module.
 
 > +config MFD_ACT8945A
 > +	bool "Active-semi ACT8945A"
 > +	select MFD_CORE
 > +	select REGMAP_I2C
 > +	depends on I2C=y && OF
 > +	help
 > +	  Support for the ACT8945A PMIC from Active-semi. This device
 > +	  features three step-down DC/DC converters and four low-dropout
 > +	  linear regulators, along with a complete ActivePath battery
 > +	  charger.
 > +

[snip]

> +++ b/drivers/mfd/act8945a.c
 > @@ -0,0 +1,109 @@
 > +/*
 > + * MFD driver for Active-semi ACT8945a PMIC
 > + *
 > + * Copyright (C) 2015 Atmel Corporation.
 > + *
 > + * Author: Wenyou Yang <wenyou.yang@atmel.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 of the License, or (at your
 > + * option) any later version.
 > + */
 > +
 > +#include <linux/i2c.h>
 > +#include <linux/mfd/act8945a.h>
 > +#include <linux/mfd/core.h>
 > +#include <linux/module.h>
 > +#include <linux/of_device.h>
 > +#include <linux/regmap.h>
 > +
 > +static const struct mfd_cell act8945a_devs[] = {
 > +	{
 > +		.name = "act8945a-pmic",
 > +		.of_compatible = "active-semi,act8945a-regulator",
 > +	},
 > +	{
 > +		.name = "act8945a-charger",
 > +		.of_compatible = "active-semi,act8945a-charger",
 > +	},
 > +};
 > +
 > +static const struct regmap_config act8945a_regmap_config = {
 > +	.reg_bits = 8,
 > +	.val_bits = 8,
 > +};
 > +
 > +static int act8945a_i2c_probe(struct i2c_client *i2c,
 > +			      const struct i2c_device_id *id)
 > +{
 > +	struct act8945a_dev *act8945a;
 > +	int ret;
 > +
 > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a), GFP_KERNEL);
 > +	if (!act8945a)
 > +		return -ENOMEM;
 > +

What is the point of this structure (and the header file)? Can't the
subdevices just do dev_get_regmap(dev->parent)? regulator_register()
afaik already does this by default.

-- 
Bye, Peter Korsgaard

RE: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Yang, Wenyou]

Hi Peter,

> -----Original Message-----
> From: Peter Korsgaard [mailto:jacmet@gmail.com] On Behalf Of Peter Korsgaard
> Sent: 2016年1月14日 21:35
> To: Yang, Wenyou <Wenyou.Yang@atmel.com>
> Cc: Lee Jones <lee.jones@linaro.org>; Rob Herring <robh+dt@kernel.org>;
> Pawel Moll <pawel.moll@arm.com>; Mark Rutland <mark.rutland@arm.com>; Ian
> Campbell <ijc+devicetree@hellion.org.uk>; Kumar Gala <galak@codeaurora.org>;
> devicetree@vger.kernel.org; Krzysztof Kozlowski <k.kozlowski@samsung.com>;
> Ferre, Nicolas <Nicolas.FERRE@atmel.com>; linux-kernel@vger.kernel.org;
> Javier Martinez Canillas <javier@dowhile0.org>; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC
> MFD driver
> 
> >>>>> "Wenyou" == Wenyou Yang <wenyou.yang@atmel.com> writes:
> 
>  > This patch adds support for the Active-semi ACT8945A PMIC.
>  > It is a Multi Function Device with the following subdevices:
>  >  - Regulator
>  >  - Charger
> 
>  > It is interfaced to the host controller using I2C interface,  > ACT8945A is a child
> device of the I2C.
> 
>  > Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>  > Reviewed-by:
> Krzysztof Kozlowski <k.kozlowski@samsung.com>  > ---
> 
>  > Changes in v5:
>  >  - change depends on to 'I2C=y'.
> 
> Why not make it a tristate instead? Having regulators as modules is perhaps not a
> very wise thing to do, but conceptually I don't see why this code couldn't be a
> module.

Yes, you are right. it can be use a tristate.

> 
>  > +config MFD_ACT8945A
>  > +	bool "Active-semi ACT8945A"
>  > +	select MFD_CORE
>  > +	select REGMAP_I2C
>  > +	depends on I2C=y && OF
>  > +	help
>  > +	  Support for the ACT8945A PMIC from Active-semi. This device
>  > +	  features three step-down DC/DC converters and four low-dropout
>  > +	  linear regulators, along with a complete ActivePath battery
>  > +	  charger.
>  > +
> 
> [snip]
> 
> > +++ b/drivers/mfd/act8945a.c
>  > @@ -0,0 +1,109 @@
>  > +/*
>  > + * MFD driver for Active-semi ACT8945a PMIC  > + *  > + * Copyright (C)
> 2015 Atmel Corporation.
>  > + *
>  > + * Author: Wenyou Yang <wenyou.yang@atmel.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 of the License, or (at your  > + * option) any
> later version.
>  > + */
>  > +
>  > +#include <linux/i2c.h>
>  > +#include <linux/mfd/act8945a.h>
>  > +#include <linux/mfd/core.h>
>  > +#include <linux/module.h>
>  > +#include <linux/of_device.h>
>  > +#include <linux/regmap.h>
>  > +
>  > +static const struct mfd_cell act8945a_devs[] = {
>  > +	{
>  > +		.name = "act8945a-pmic",
>  > +		.of_compatible = "active-semi,act8945a-regulator",
>  > +	},
>  > +	{
>  > +		.name = "act8945a-charger",
>  > +		.of_compatible = "active-semi,act8945a-charger",
>  > +	},
>  > +};
>  > +
>  > +static const struct regmap_config act8945a_regmap_config = {
>  > +	.reg_bits = 8,
>  > +	.val_bits = 8,
>  > +};
>  > +
>  > +static int act8945a_i2c_probe(struct i2c_client *i2c,
>  > +			      const struct i2c_device_id *id)
>  > +{
>  > +	struct act8945a_dev *act8945a;
>  > +	int ret;
>  > +
>  > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a), GFP_KERNEL);
>  > +	if (!act8945a)
>  > +		return -ENOMEM;
>  > +
> 
> What is the point of this structure (and the header file)? Can't the subdevices just
> do dev_get_regmap(dev->parent)? regulator_register() afaik already does this by
> default.

Yes, I re-read regulator_register() code. It did do dev_get_regmap(dev->parent).

I think this structure should be pointed by dev->parent, this structure is necessary.

Yes regulator driver should be simpler.

Moreover, it is used by another sub device, charger. Which don't such code.

> 
> --
> Bye, Peter Korsgaard


Best Regards,
Wenyou Yang

Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Peter Korsgaard]

>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:

Hi,

 >> Why not make it a tristate instead? Having regulators as modules is perhaps not a
 >> very wise thing to do, but conceptually I don't see why this code couldn't be a
 >> module.

 > Yes, you are right. it can be use a tristate.

Ok, good.

>> > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a), GFP_KERNEL);
 >> > +	if (!act8945a)
 >> > +		return -ENOMEM;
 >> > +
 >> 
 >> What is the point of this structure (and the header file)? Can't the subdevices just
 >> do dev_get_regmap(dev->parent)? regulator_register() afaik already does this by
 >> default.

 > Yes, I re-read regulator_register() code. It did do dev_get_regmap(dev->parent).

 > I think this structure should be pointed by dev->parent, this structure is necessary.

 > Yes regulator driver should be simpler.

 > Moreover, it is used by another sub device, charger. Which don't such code.

But the charger driver can just as well do:

dev_get_regmap(dev->parent);

instead of:

dev_get_drvdata(pdev->dev.parent)->regmap.

-- 
Venlig hilsen,
Peter Korsgaard 

RE: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Yang, Wenyou]

Hi Peter,

> -----Original Message-----
> From: Peter Korsgaard [mailto:jacmet@gmail.com] On Behalf Of Peter Korsgaard
> Sent: 2016年1月15日 15:58
> To: Yang, Wenyou <Wenyou.Yang@atmel.com>
> Cc: Lee Jones <lee.jones@linaro.org>; Rob Herring <robh+dt@kernel.org>;
> Pawel Moll <pawel.moll@arm.com>; Mark Rutland <mark.rutland@arm.com>; Ian
> Campbell <ijc+devicetree@hellion.org.uk>; Kumar Gala <galak@codeaurora.org>;
> devicetree@vger.kernel.org; Krzysztof Kozlowski <k.kozlowski@samsung.com>;
> Ferre, Nicolas <Nicolas.FERRE@atmel.com>; linux-kernel@vger.kernel.org;
> Javier Martinez Canillas <javier@dowhile0.org>; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC
> MFD driver
> 
> >>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:
> 
> Hi,
> 
>  >> Why not make it a tristate instead? Having regulators as modules is perhaps
> not a  >> very wise thing to do, but conceptually I don't see why this code couldn't
> be a  >> module.
> 
>  > Yes, you are right. it can be use a tristate.
> 
> Ok, good.
> 
> >> > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a),
> >> > +GFP_KERNEL);
>  >> > +	if (!act8945a)
>  >> > +		return -ENOMEM;
>  >> > +
>  >>
>  >> What is the point of this structure (and the header file)? Can't the subdevices
> just  >> do dev_get_regmap(dev->parent)? regulator_register() afaik already does
> this by  >> default.
> 
>  > Yes, I re-read regulator_register() code. It did do dev_get_regmap(dev-
> >parent).
> 
>  > I think this structure should be pointed by dev->parent, this structure is
> necessary.
> 
>  > Yes regulator driver should be simpler.
> 
>  > Moreover, it is used by another sub device, charger. Which don't such code.
> 
> But the charger driver can just as well do:
> 
> dev_get_regmap(dev->parent);
> 
> instead of:
> 
> dev_get_drvdata(pdev->dev.parent)->regmap.

Understand. 

Thank you!


Best Regards,
Wenyou Yang

RE: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Yang, Wenyou]

Hi Peter,

> -----Original Message-----
> From: Peter Korsgaard [mailto:jacmet@gmail.com] On Behalf Of Peter Korsgaard
> Sent: 2016年1月15日 15:58
> To: Yang, Wenyou <Wenyou.Yang@atmel.com>
> Cc: Lee Jones <lee.jones@linaro.org>; Rob Herring <robh+dt@kernel.org>;
> Pawel Moll <pawel.moll@arm.com>; Mark Rutland <mark.rutland@arm.com>; Ian
> Campbell <ijc+devicetree@hellion.org.uk>; Kumar Gala <galak@codeaurora.org>;
> devicetree@vger.kernel.org; Krzysztof Kozlowski <k.kozlowski@samsung.com>;
> Ferre, Nicolas <Nicolas.FERRE@atmel.com>; linux-kernel@vger.kernel.org;
> Javier Martinez Canillas <javier@dowhile0.org>; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC
> MFD driver
> 
> >>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:
> 
> Hi,
> 
>  >> Why not make it a tristate instead? Having regulators as modules is perhaps
> not a  >> very wise thing to do, but conceptually I don't see why this code couldn't
> be a  >> module.
> 
>  > Yes, you are right. it can be use a tristate.
> 
> Ok, good.
> 
> >> > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a),
> >> > +GFP_KERNEL);
>  >> > +	if (!act8945a)
>  >> > +		return -ENOMEM;
>  >> > +
>  >>
>  >> What is the point of this structure (and the header file)? Can't the subdevices
> just  >> do dev_get_regmap(dev->parent)? regulator_register() afaik already does
> this by  >> default.
> 
>  > Yes, I re-read regulator_register() code. It did do dev_get_regmap(dev-
> >parent).
> 
>  > I think this structure should be pointed by dev->parent, this structure is
> necessary.
> 
>  > Yes regulator driver should be simpler.
> 
>  > Moreover, it is used by another sub device, charger. Which don't such code.
> 
> But the charger driver can just as well do:
> 
> dev_get_regmap(dev->parent);
> 
> instead of:
> 
> dev_get_drvdata(pdev->dev.parent)->regmap.

For regulator, it works use the core do dev_get_regmap(dev->parent), but for charger, it need to export *act8945a.


Best Regards,
Wenyou Yang

Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Peter Korsgaard]

>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:

Hi,

>> But the charger driver can just as well do:
 >> 
 >> dev_get_regmap(dev->parent);
 >> 
 >> instead of:
 >> 
 >> dev_get_drvdata(pdev->dev.parent)->regmap.

 > For regulator, it works use the core do dev_get_regmap(dev->parent),
 > but for charger, it need to export *act8945a.

Why?

Just like the regulator core does, your battery driver can do:

dev_get_regmap(dev->parent);

-- 
Venlig hilsen,
Peter Korsgaard 

Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Yang, Wenyou]

Hi Peter,

On 2016/1/20 15:40, Peter Korsgaard wrote:
>>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:
> Hi,
>
>>> But the charger driver can just as well do:
>   >>
>   >> dev_get_regmap(dev->parent);
>   >>
>   >> instead of:
>   >>
>   >> dev_get_drvdata(pdev->dev.parent)->regmap.
>
>   > For regulator, it works use the core do dev_get_regmap(dev->parent),
>   > but for charger, it need to export *act8945a.
>
> Why?

There is a callback (*get_property)(...), who will read the charger 
register via regmap,

but it doesn't provide the argument for regmap.

include/linux/power_supply.h

struct power_supply_desc {
         [ ... ]
         int (*get_property)(struct power_supply *psy,
                              enum power_supply_property psp,
                              union power_supply_propval *val);
         [ ... ]

}

>
> Just like the regulator core does, your battery driver can do:
>
> dev_get_regmap(dev->parent);
>

Best Regards,
Wenyou Yang

Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Krzysztof Kozlowski]

On 20.01.2016 16:50, Yang, Wenyou wrote:
> Hi Peter,
> 
> On 2016/1/20 15:40, Peter Korsgaard wrote:
>>>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@atmel.com> writes:
>> Hi,
>>
>>>> But the charger driver can just as well do:
>>   >>
>>   >> dev_get_regmap(dev->parent);
>>   >>
>>   >> instead of:
>>   >>
>>   >> dev_get_drvdata(pdev->dev.parent)->regmap.
>>
>>   > For regulator, it works use the core do dev_get_regmap(dev->parent),
>>   > but for charger, it need to export *act8945a.
>>
>> Why?
> 
> There is a callback (*get_property)(...), who will read the charger
> register via regmap,
> 
> but it doesn't provide the argument for regmap.
> 
> include/linux/power_supply.h
> 
> struct power_supply_desc {
>         [ ... ]
>         int (*get_property)(struct power_supply *psy,
>                              enum power_supply_property psp,
>                              union power_supply_propval *val);
>         [ ... ]
> 
> }
> 
>>
>> Just like the regulator core does, your battery driver can do:
>>
>> dev_get_regmap(dev->parent);
>>

Why can't you store the pointer to regmap as power supply driver data?
There is really no need for the structure containing only one pointer.

BR,
Krzysztof