[PATCH v9 0/6] Add battery charger driver support for MP2629

[PATCH v9 0/6] Add battery charger driver support for MP2629

[Saravanan Sekar]

changes in v9:
 - fixed review comments in mp2629 power supply such as resource based
   iio channel, replace workqueue by threaded irq, irq get with "_optional"

changes in v8:
 - fixed order of call in probe/remove in iio adc
 - add ABI documentation for mp2629 power supply

changes in v7:
 - fixed probe/remove order, managed and unmanaged call mix use in adc.
 - Documentation dual license, i2c node with controller address

Overall looks good to me, FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

One question though in reply to patch 4.

changes in v6:
 - removed includes types.h in mfd, of_device.h in adc.
 - fixed review comments parentheses, err check, kstrtouint

changes in v5:
 - removed platfrom data stored in mfd and directly accessed mfd struct in child
 - fixed spell check and capitalization in mfd and documentation

changes in v4:
 - fixed capitalization in mfg Kconfig and documentation

changes in v3:
 - regmap for children passed using platform data and remove mfd driver info
   access directly from children

changes in v2:
 - removed EXPORT_SYMBOL of register set/get helper
 - regmap bit filed used, fixed other review comments

This patch series add support for Battery charger control driver for Monolithic
Power System's MP2629 chipset, includes MFD driver for ADC battery & input
power supply measurement and battery charger control driver.

Thanks,
Saravanan

Saravanan Sekar (6):
  dt-bindings: mfd: add document bindings for mp2629
  mfd: mp2629: Add support for mps battery charger
  iio: adc: mp2629: Add support for mp2629 ADC driver
  power: supply: Add support for mps mp2629 battery charger
  power: supply: mp2629: Add impedance compenstation config
  MAINTAINERS: Add entry for mp2629 Battery Charger driver

 .../ABI/testing/sysfs-class-power-mp2629      |   8 +
 .../devicetree/bindings/mfd/mps,mp2629.yaml   |  60 ++
 MAINTAINERS                                   |   5 +
 drivers/iio/adc/Kconfig                       |  10 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/mp2629_adc.c                  | 208 ++++++
 drivers/mfd/Kconfig                           |   9 +
 drivers/mfd/Makefile                          |   2 +
 drivers/mfd/mp2629.c                          |  86 +++
 drivers/power/supply/Kconfig                  |  10 +
 drivers/power/supply/Makefile                 |   1 +
 drivers/power/supply/mp2629_charger.c         | 667 ++++++++++++++++++
 include/linux/mfd/mp2629.h                    |  28 +
 13 files changed, 1095 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-power-mp2629
 create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
 create mode 100644 drivers/iio/adc/mp2629_adc.c
 create mode 100644 drivers/mfd/mp2629.c
 create mode 100644 drivers/power/supply/mp2629_charger.c
 create mode 100644 include/linux/mfd/mp2629.h

-- 
2.17.1

[PATCH v9 1/6] dt-bindings: mfd: add document bindings for mp2629

[Saravanan Sekar]

Add device tree binding information for mp2629 mfd driver.

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 .../devicetree/bindings/mfd/mps,mp2629.yaml   | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml

diff --git a/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml b/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
new file mode 100644
index 000000000000..e71c554802a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/mps,mp2629.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MP2629 Battery Charger PMIC from Monolithic Power System.
+
+maintainers:
+  - Saravanan Sekar <sravanhome@gmail.com>
+
+description: |
+  MP2629 is a PMIC providing battery charging and power supply for smartphones,
+  wireless camera and portable devices. Chip is contrlled over I2C.
+
+  The battery charge management device handles battery charger controller and
+  ADC IIO device for battery, system voltage
+
+properties:
+  compatible:
+    const: mps,mp2629
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 2
+    description:
+      The first cell is the IRQ number, the second cell is the trigger type.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - "#interrupt-cells"
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/input/linux-event-codes.h>
+    i2c@7e205000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pmic@4b {
+            compatible = "mps,mp2629";
+            reg = <0x4b>;
+
+            interrupt-controller;
+            interrupt-parent = <&gpio2>;
+            #interrupt-cells = <2>;
+            interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
-- 
2.17.1

Re: [PATCH v9 1/6] dt-bindings: mfd: add document bindings for mp2629

[Rob Herring]

On Wed, 15 Apr 2020 18:20:25 +0200, Saravanan Sekar wrote:
> Add device tree binding information for mp2629 mfd driver.
> 
> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> ---
>  .../devicetree/bindings/mfd/mps,mp2629.yaml   | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> 

My bot found errors running 'make dt_binding_check' on your patch:

Documentation/devicetree/bindings/mfd/mps,mp2629.example.dts:19.22-32.11: Warning (unit_address_vs_reg): /example-0/i2c@7e205000: node has a unit name, but no reg or ranges property

See https://patchwork.ozlabs.org/patch/1271317

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.

[PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Saravanan Sekar]

mp2629 is a highly-integrated switching-mode battery charge management
device for single-cell Li-ion or Li-polymer battery.

Add MFD core enables chip access for ADC driver for battery readings,
and a power supply battery-charger driver

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 drivers/mfd/Kconfig        |  9 ++++
 drivers/mfd/Makefile       |  2 +
 drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/mp2629.h | 19 +++++++++
 4 files changed, 116 insertions(+)
 create mode 100644 drivers/mfd/mp2629.c
 create mode 100644 include/linux/mfd/mp2629.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3c547ed575e6..85be799795aa 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
 	help
 	  Select this if your MC13xxx is connected via an I2C bus.
 
+config MFD_MP2629
+	tristate "Monolithic power system MP2629 ADC and Battery charger"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Select this option to enable support for monolithic power system
+	  battery charger. This provides ADC, thermal, battery charger power
+	  management functions on the systems.
+
 config MFD_MXS_LRADC
 	tristate "Freescale i.MX23/i.MX28 LRADC"
 	depends on ARCH_MXS || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f935d10cbf0f..d6c210f96d02 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -170,6 +170,8 @@ obj-$(CONFIG_MFD_MAX8925)	+= max8925.o
 obj-$(CONFIG_MFD_MAX8997)	+= max8997.o max8997-irq.o
 obj-$(CONFIG_MFD_MAX8998)	+= max8998.o max8998-irq.o
 
+obj-$(CONFIG_MFD_MP2629)	+= mp2629.o
+
 pcf50633-objs			:= pcf50633-core.o pcf50633-irq.o
 obj-$(CONFIG_MFD_PCF50633)	+= pcf50633.o
 obj-$(CONFIG_PCF50633_ADC)	+= pcf50633-adc.o
diff --git a/drivers/mfd/mp2629.c b/drivers/mfd/mp2629.c
new file mode 100644
index 000000000000..46242b1cdf24
--- /dev/null
+++ b/drivers/mfd/mp2629.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MP2629 parent driver for ADC and battery charger
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@gmail.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mp2629.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+enum {
+	MP2629_MFD_ADC,
+	MP2629_MFD_CHARGER,
+	MP2629_MFD_MAX
+};
+
+static const struct mfd_cell mp2629mfd[] = {
+	[MP2629_MFD_ADC] = {
+		.name = "mp2629_adc",
+		.of_compatible = "mps,mp2629_adc",
+	},
+	[MP2629_MFD_CHARGER] = {
+		.name = "mp2629_charger",
+		.of_compatible = "mps,mp2629_charger",
+	}
+};
+
+static const struct regmap_config mp2629_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x17,
+};
+
+static int mp2629_probe(struct i2c_client *client)
+{
+	struct mp2629_info *ddata;
+	int ret;
+
+	ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	ddata->dev = &client->dev;
+	i2c_set_clientdata(client, ddata);
+
+	ddata->regmap = devm_regmap_init_i2c(client, &mp2629_regmap_config);
+	if (IS_ERR(ddata->regmap)) {
+		dev_err(ddata->dev, "Failed to allocate regmap!\n");
+		return PTR_ERR(ddata->regmap);
+	}
+
+	ret = devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_NONE, mp2629mfd,
+				ARRAY_SIZE(mp2629mfd), NULL,
+				0, NULL);
+	if (ret)
+		dev_err(ddata->dev, "Failed to register sub-devices %d\n", ret);
+
+	return ret;
+}
+
+static const struct of_device_id mp2629_of_match[] = {
+	{ .compatible = "mps,mp2629"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mp2629_of_match);
+
+static struct i2c_driver mp2629_driver = {
+	.driver = {
+		.name = "mp2629",
+		.of_match_table = mp2629_of_match,
+	},
+	.probe_new	= mp2629_probe,
+};
+module_i2c_driver(mp2629_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
+MODULE_DESCRIPTION("MP2629 Battery charger parent driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/mp2629.h b/include/linux/mfd/mp2629.h
new file mode 100644
index 000000000000..06985e41fc6f
--- /dev/null
+++ b/include/linux/mfd/mp2629.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * register definitions for MP2629 charger
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ */
+
+#ifndef __MP2629_H__
+#define __MP2629_H__
+
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+struct mp2629_info {
+	struct device *dev;
+	struct regmap *regmap;
+};
+
+#endif
-- 
2.17.1

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Lee Jones]

On Wed, 15 Apr 2020, Saravanan Sekar wrote:

> mp2629 is a highly-integrated switching-mode battery charge management
> device for single-cell Li-ion or Li-polymer battery.
> 
> Add MFD core enables chip access for ADC driver for battery readings,
> and a power supply battery-charger driver
> 
> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> ---
>  drivers/mfd/Kconfig        |  9 ++++
>  drivers/mfd/Makefile       |  2 +
>  drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/mp2629.h | 19 +++++++++
>  4 files changed, 116 insertions(+)
>  create mode 100644 drivers/mfd/mp2629.c
>  create mode 100644 include/linux/mfd/mp2629.h

How is this driver registered?

Looks like it has device tree support.  Is there another way?

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3c547ed575e6..85be799795aa 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>  	help
>  	  Select this if your MC13xxx is connected via an I2C bus.
>  
> +config MFD_MP2629
> +	tristate "Monolithic power system MP2629 ADC and Battery charger"
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	  Select this option to enable support for monolithic power system
> +	  battery charger. This provides ADC, thermal, battery charger power
> +	  management functions on the systems.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[saravanan sekar]

Hi Lee,

On 24/04/20 9:18 am, Lee Jones wrote:
> On Wed, 15 Apr 2020, Saravanan Sekar wrote:
>
>> mp2629 is a highly-integrated switching-mode battery charge management
>> device for single-cell Li-ion or Li-polymer battery.
>>
>> Add MFD core enables chip access for ADC driver for battery readings,
>> and a power supply battery-charger driver
>>
>> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
>> ---
>>   drivers/mfd/Kconfig        |  9 ++++
>>   drivers/mfd/Makefile       |  2 +
>>   drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>>   include/linux/mfd/mp2629.h | 19 +++++++++
>>   4 files changed, 116 insertions(+)
>>   create mode 100644 drivers/mfd/mp2629.c
>>   create mode 100644 include/linux/mfd/mp2629.h
> How is this driver registered?
>
> Looks like it has device tree support.  Is there another way?
Yes, only using device tree
>
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>> index 3c547ed575e6..85be799795aa 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>>   	help
>>   	  Select this if your MC13xxx is connected via an I2C bus.
>>   
>> +config MFD_MP2629
>> +	tristate "Monolithic power system MP2629 ADC and Battery charger"
>> +	depends on I2C
>> +	select REGMAP_I2C
>> +	help
>> +	  Select this option to enable support for monolithic power system
>> +	  battery charger. This provides ADC, thermal, battery charger power
>> +	  management functions on the systems.

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Lee Jones]

On Fri, 24 Apr 2020, saravanan sekar wrote:

> Hi Lee,
> 
> On 24/04/20 9:18 am, Lee Jones wrote:
> > On Wed, 15 Apr 2020, Saravanan Sekar wrote:
> > 
> > > mp2629 is a highly-integrated switching-mode battery charge management
> > > device for single-cell Li-ion or Li-polymer battery.
> > > 
> > > Add MFD core enables chip access for ADC driver for battery readings,
> > > and a power supply battery-charger driver
> > > 
> > > Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> > > ---
> > >   drivers/mfd/Kconfig        |  9 ++++
> > >   drivers/mfd/Makefile       |  2 +
> > >   drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
> > >   include/linux/mfd/mp2629.h | 19 +++++++++
> > >   4 files changed, 116 insertions(+)
> > >   create mode 100644 drivers/mfd/mp2629.c
> > >   create mode 100644 include/linux/mfd/mp2629.h
> > How is this driver registered?
> > 
> > Looks like it has device tree support.  Is there another way?
> Yes, only using device tree

Then how about using 'simple-mfd' and 'syscon'?

Then you can omit this driver completely.

> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index 3c547ed575e6..85be799795aa 100644
> > > --- a/drivers/mfd/Kconfig
> > > +++ b/drivers/mfd/Kconfig
> > > @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
> > >   	help
> > >   	  Select this if your MC13xxx is connected via an I2C bus.
> > > +config MFD_MP2629
> > > +	tristate "Monolithic power system MP2629 ADC and Battery charger"
> > > +	depends on I2C
> > > +	select REGMAP_I2C
> > > +	help
> > > +	  Select this option to enable support for monolithic power system
> > > +	  battery charger. This provides ADC, thermal, battery charger power
> > > +	  management functions on the systems.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[saravanan sekar]

Hi Lee,

On 24/04/20 11:37 am, Lee Jones wrote:
> On Fri, 24 Apr 2020, saravanan sekar wrote:
>
>> Hi Lee,
>>
>> On 24/04/20 9:18 am, Lee Jones wrote:
>>> On Wed, 15 Apr 2020, Saravanan Sekar wrote:
>>>
>>>> mp2629 is a highly-integrated switching-mode battery charge management
>>>> device for single-cell Li-ion or Li-polymer battery.
>>>>
>>>> Add MFD core enables chip access for ADC driver for battery readings,
>>>> and a power supply battery-charger driver
>>>>
>>>> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
>>>> ---
>>>>    drivers/mfd/Kconfig        |  9 ++++
>>>>    drivers/mfd/Makefile       |  2 +
>>>>    drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>>>>    include/linux/mfd/mp2629.h | 19 +++++++++
>>>>    4 files changed, 116 insertions(+)
>>>>    create mode 100644 drivers/mfd/mp2629.c
>>>>    create mode 100644 include/linux/mfd/mp2629.h
>>> How is this driver registered?
>>>
>>> Looks like it has device tree support.  Is there another way?
>> Yes, only using device tree
> Then how about using 'simple-mfd' and 'syscon'?
>
> Then you can omit this driver completely.
The exception is to support for non device tree platform as well, but I 
have tested only for ARM device tree platform.
>
>>>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>>>> index 3c547ed575e6..85be799795aa 100644
>>>> --- a/drivers/mfd/Kconfig
>>>> +++ b/drivers/mfd/Kconfig
>>>> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>>>>    	help
>>>>    	  Select this if your MC13xxx is connected via an I2C bus.
>>>> +config MFD_MP2629
>>>> +	tristate "Monolithic power system MP2629 ADC and Battery charger"
>>>> +	depends on I2C
>>>> +	select REGMAP_I2C
>>>> +	help
>>>> +	  Select this option to enable support for monolithic power system
>>>> +	  battery charger. This provides ADC, thermal, battery charger power
>>>> +	  management functions on the systems.

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Lee Jones]

On Fri, 24 Apr 2020, saravanan sekar wrote:

> Hi Lee,
> 
> On 24/04/20 11:37 am, Lee Jones wrote:
> > On Fri, 24 Apr 2020, saravanan sekar wrote:
> > 
> > > Hi Lee,
> > > 
> > > On 24/04/20 9:18 am, Lee Jones wrote:
> > > > On Wed, 15 Apr 2020, Saravanan Sekar wrote:
> > > > 
> > > > > mp2629 is a highly-integrated switching-mode battery charge management
> > > > > device for single-cell Li-ion or Li-polymer battery.
> > > > > 
> > > > > Add MFD core enables chip access for ADC driver for battery readings,
> > > > > and a power supply battery-charger driver
> > > > > 
> > > > > Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> > > > > ---
> > > > >    drivers/mfd/Kconfig        |  9 ++++
> > > > >    drivers/mfd/Makefile       |  2 +
> > > > >    drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
> > > > >    include/linux/mfd/mp2629.h | 19 +++++++++
> > > > >    4 files changed, 116 insertions(+)
> > > > >    create mode 100644 drivers/mfd/mp2629.c
> > > > >    create mode 100644 include/linux/mfd/mp2629.h
> > > > How is this driver registered?
> > > > 
> > > > Looks like it has device tree support.  Is there another way?
> > > Yes, only using device tree
> > Then how about using 'simple-mfd' and 'syscon'?
> > 
> > Then you can omit this driver completely.
> 
> The exception is to support for non device tree platform as well, but I have
> tested only for ARM device tree platform.

Is that a reality though?

How else do you see this realistically being registered?

> > > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > > > index 3c547ed575e6..85be799795aa 100644
> > > > > --- a/drivers/mfd/Kconfig
> > > > > +++ b/drivers/mfd/Kconfig
> > > > > @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
> > > > >    	help
> > > > >    	  Select this if your MC13xxx is connected via an I2C bus.
> > > > > +config MFD_MP2629
> > > > > +	tristate "Monolithic power system MP2629 ADC and Battery charger"
> > > > > +	depends on I2C
> > > > > +	select REGMAP_I2C
> > > > > +	help
> > > > > +	  Select this option to enable support for monolithic power system
> > > > > +	  battery charger. This provides ADC, thermal, battery charger power
> > > > > +	  management functions on the systems.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[saravanan sekar]

On 24/04/20 12:53 pm, Lee Jones wrote:
> On Fri, 24 Apr 2020, saravanan sekar wrote:
>
>> Hi Lee,
>>
>> On 24/04/20 11:37 am, Lee Jones wrote:
>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>>
>>>> Hi Lee,
>>>>
>>>> On 24/04/20 9:18 am, Lee Jones wrote:
>>>>> On Wed, 15 Apr 2020, Saravanan Sekar wrote:
>>>>>
>>>>>> mp2629 is a highly-integrated switching-mode battery charge management
>>>>>> device for single-cell Li-ion or Li-polymer battery.
>>>>>>
>>>>>> Add MFD core enables chip access for ADC driver for battery readings,
>>>>>> and a power supply battery-charger driver
>>>>>>
>>>>>> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
>>>>>> ---
>>>>>>     drivers/mfd/Kconfig        |  9 ++++
>>>>>>     drivers/mfd/Makefile       |  2 +
>>>>>>     drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>>>>>>     include/linux/mfd/mp2629.h | 19 +++++++++
>>>>>>     4 files changed, 116 insertions(+)
>>>>>>     create mode 100644 drivers/mfd/mp2629.c
>>>>>>     create mode 100644 include/linux/mfd/mp2629.h
>>>>> How is this driver registered?
>>>>>
>>>>> Looks like it has device tree support.  Is there another way?
>>>> Yes, only using device tree
>>> Then how about using 'simple-mfd' and 'syscon'?
>>>
>>> Then you can omit this driver completely.
>> The exception is to support for non device tree platform as well, but I have
>> tested only for ARM device tree platform.
> Is that a reality though?
>
> How else do you see this realistically being registered?
>
I understand that acpi related device table are not covered here, well I 
don't have to platform to test so.
If you ask me to cover acpi related table, I can do but hard to test.
>>>>>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>>>>>> index 3c547ed575e6..85be799795aa 100644
>>>>>> --- a/drivers/mfd/Kconfig
>>>>>> +++ b/drivers/mfd/Kconfig
>>>>>> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>>>>>>     	help
>>>>>>     	  Select this if your MC13xxx is connected via an I2C bus.
>>>>>> +config MFD_MP2629
>>>>>> +	tristate "Monolithic power system MP2629 ADC and Battery charger"
>>>>>> +	depends on I2C
>>>>>> +	select REGMAP_I2C
>>>>>> +	help
>>>>>> +	  Select this option to enable support for monolithic power system
>>>>>> +	  battery charger. This provides ADC, thermal, battery charger power
>>>>>> +	  management functions on the systems.

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Lee Jones]

On Fri, 24 Apr 2020, saravanan sekar wrote:

> 
> On 24/04/20 12:53 pm, Lee Jones wrote:
> > On Fri, 24 Apr 2020, saravanan sekar wrote:
> > 
> > > Hi Lee,
> > > 
> > > On 24/04/20 11:37 am, Lee Jones wrote:
> > > > On Fri, 24 Apr 2020, saravanan sekar wrote:
> > > > 
> > > > > Hi Lee,
> > > > > 
> > > > > On 24/04/20 9:18 am, Lee Jones wrote:
> > > > > > On Wed, 15 Apr 2020, Saravanan Sekar wrote:
> > > > > > 
> > > > > > > mp2629 is a highly-integrated switching-mode battery charge management
> > > > > > > device for single-cell Li-ion or Li-polymer battery.
> > > > > > > 
> > > > > > > Add MFD core enables chip access for ADC driver for battery readings,
> > > > > > > and a power supply battery-charger driver
> > > > > > > 
> > > > > > > Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> > > > > > > ---
> > > > > > >     drivers/mfd/Kconfig        |  9 ++++
> > > > > > >     drivers/mfd/Makefile       |  2 +
> > > > > > >     drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
> > > > > > >     include/linux/mfd/mp2629.h | 19 +++++++++
> > > > > > >     4 files changed, 116 insertions(+)
> > > > > > >     create mode 100644 drivers/mfd/mp2629.c
> > > > > > >     create mode 100644 include/linux/mfd/mp2629.h
> > > > > > How is this driver registered?
> > > > > > 
> > > > > > Looks like it has device tree support.  Is there another way?
> > > > > Yes, only using device tree
> > > > Then how about using 'simple-mfd' and 'syscon'?
> > > > 
> > > > Then you can omit this driver completely.
> > > The exception is to support for non device tree platform as well, but I have
> > > tested only for ARM device tree platform.
> > Is that a reality though?
> > 
> > How else do you see this realistically being registered?
> > 
> I understand that acpi related device table are not covered here, well I
> don't have to platform to test so.
> If you ask me to cover acpi related table, I can do but hard to test.

I don't know of any reasons why syscon can't be used by ACPI.

Please try to solve this issue using 'simple-mfd' and 'syscon'.

> > > > > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > > > > > index 3c547ed575e6..85be799795aa 100644
> > > > > > > --- a/drivers/mfd/Kconfig
> > > > > > > +++ b/drivers/mfd/Kconfig
> > > > > > > @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
> > > > > > >     	help
> > > > > > >     	  Select this if your MC13xxx is connected via an I2C bus.
> > > > > > > +config MFD_MP2629
> > > > > > > +	tristate "Monolithic power system MP2629 ADC and Battery charger"
> > > > > > > +	depends on I2C
> > > > > > > +	select REGMAP_I2C
> > > > > > > +	help
> > > > > > > +	  Select this option to enable support for monolithic power system
> > > > > > > +	  battery charger. This provides ADC, thermal, battery charger power
> > > > > > > +	  management functions on the systems.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[saravanan sekar]

Hi Lee,

On 27/04/20 10:51 am, Lee Jones wrote:
> On Fri, 24 Apr 2020, saravanan sekar wrote:
>
>> On 24/04/20 12:53 pm, Lee Jones wrote:
>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>>
>>>> Hi Lee,
>>>>
>>>> On 24/04/20 11:37 am, Lee Jones wrote:
>>>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>>>>
>>>>>> Hi Lee,
>>>>>>
>>>>>> On 24/04/20 9:18 am, Lee Jones wrote:
>>>>>>> On Wed, 15 Apr 2020, Saravanan Sekar wrote:
>>>>>>>
>>>>>>>> mp2629 is a highly-integrated switching-mode battery charge management
>>>>>>>> device for single-cell Li-ion or Li-polymer battery.
>>>>>>>>
>>>>>>>> Add MFD core enables chip access for ADC driver for battery readings,
>>>>>>>> and a power supply battery-charger driver
>>>>>>>>
>>>>>>>> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
>>>>>>>> ---
>>>>>>>>      drivers/mfd/Kconfig        |  9 ++++
>>>>>>>>      drivers/mfd/Makefile       |  2 +
>>>>>>>>      drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>>>>>>>>      include/linux/mfd/mp2629.h | 19 +++++++++
>>>>>>>>      4 files changed, 116 insertions(+)
>>>>>>>>      create mode 100644 drivers/mfd/mp2629.c
>>>>>>>>      create mode 100644 include/linux/mfd/mp2629.h
>>>>>>> How is this driver registered?
>>>>>>>
>>>>>>> Looks like it has device tree support.  Is there another way?
>>>>>> Yes, only using device tree
>>>>> Then how about using 'simple-mfd' and 'syscon'?
>>>>>
>>>>> Then you can omit this driver completely.
>>>> The exception is to support for non device tree platform as well, but I have
>>>> tested only for ARM device tree platform.
>>> Is that a reality though?
>>>
>>> How else do you see this realistically being registered?
>>>
>> I understand that acpi related device table are not covered here, well I
>> don't have to platform to test so.
>> If you ask me to cover acpi related table, I can do but hard to test.
> I don't know of any reasons why syscon can't be used by ACPI.
>
> Please try to solve this issue using 'simple-mfd' and 'syscon'.
Well the simple-mfd and syscon topic recommended by you when Device tree 
alone is used.
I wounder still I receive review/improvements comments for this mfd 
patch and also another
to omit this driver using simple-mfd (rework the series).
Confused, not sure which is valid and will be accepted at the end.
>
>>>>>>>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>>>>>>>> index 3c547ed575e6..85be799795aa 100644
>>>>>>>> --- a/drivers/mfd/Kconfig
>>>>>>>> +++ b/drivers/mfd/Kconfig
>>>>>>>> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>>>>>>>>      	help
>>>>>>>>      	  Select this if your MC13xxx is connected via an I2C bus.
>>>>>>>> +config MFD_MP2629
>>>>>>>> +	tristate "Monolithic power system MP2629 ADC and Battery charger"
>>>>>>>> +	depends on I2C
>>>>>>>> +	select REGMAP_I2C
>>>>>>>> +	help
>>>>>>>> +	  Select this option to enable support for monolithic power system
>>>>>>>> +	  battery charger. This provides ADC, thermal, battery charger power
>>>>>>>> +	  management functions on the systems.

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[saravanan sekar]

Hi Lee,

On 27/04/20 11:30 am, saravanan sekar wrote:
> Hi Lee,
>
> On 27/04/20 10:51 am, Lee Jones wrote:
>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>
>>> On 24/04/20 12:53 pm, Lee Jones wrote:
>>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>>>
>>>>> Hi Lee,
>>>>>
>>>>> On 24/04/20 11:37 am, Lee Jones wrote:
>>>>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
>>>>>>
>>>>>>> Hi Lee,
>>>>>>>
>>>>>>> On 24/04/20 9:18 am, Lee Jones wrote:
>>>>>>>> On Wed, 15 Apr 2020, Saravanan Sekar wrote:
>>>>>>>>
>>>>>>>>> mp2629 is a highly-integrated switching-mode battery charge 
>>>>>>>>> management
>>>>>>>>> device for single-cell Li-ion or Li-polymer battery.
>>>>>>>>>
>>>>>>>>> Add MFD core enables chip access for ADC driver for battery 
>>>>>>>>> readings,
>>>>>>>>> and a power supply battery-charger driver
>>>>>>>>>
>>>>>>>>> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
>>>>>>>>> ---
>>>>>>>>>      drivers/mfd/Kconfig        |  9 ++++
>>>>>>>>>      drivers/mfd/Makefile       |  2 +
>>>>>>>>>      drivers/mfd/mp2629.c       | 86 
>>>>>>>>> ++++++++++++++++++++++++++++++++++++++
>>>>>>>>>      include/linux/mfd/mp2629.h | 19 +++++++++
>>>>>>>>>      4 files changed, 116 insertions(+)
>>>>>>>>>      create mode 100644 drivers/mfd/mp2629.c
>>>>>>>>>      create mode 100644 include/linux/mfd/mp2629.h
>>>>>>>> How is this driver registered?
>>>>>>>>
>>>>>>>> Looks like it has device tree support.  Is there another way?
>>>>>>> Yes, only using device tree
>>>>>> Then how about using 'simple-mfd' and 'syscon'?
>>>>>>
>>>>>> Then you can omit this driver completely.
>>>>> The exception is to support for non device tree platform as well, 
>>>>> but I have
>>>>> tested only for ARM device tree platform.
>>>> Is that a reality though?
>>>>
>>>> How else do you see this realistically being registered?
>>>>
>>> I understand that acpi related device table are not covered here, 
>>> well I
>>> don't have to platform to test so.
>>> If you ask me to cover acpi related table, I can do but hard to test.
>> I don't know of any reasons why syscon can't be used by ACPI.
>>
>> Please try to solve this issue using 'simple-mfd' and 'syscon'.
> Well the simple-mfd and syscon topic recommended by you when Device 
> tree alone is used.
> I wounder still I receive review/improvements comments for this mfd 
> patch and also another
> to omit this driver using simple-mfd (rework the series).
> Confused, not sure which is valid and will be accepted at the end.

I had look into syscon, as far my understanding syscon is supported only 
for memory mapped IO. MP2629
device is over I2C bus, could you share your thought about syscon for 
this device?

Thanks,
Saravanan

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Andy Shevchenko]

On Thu, Apr 30, 2020 at 1:39 PM saravanan sekar <sravanhome@gmail.com> wrote:
> On 27/04/20 11:30 am, saravanan sekar wrote:
> > On 27/04/20 10:51 am, Lee Jones wrote:
> >> On Fri, 24 Apr 2020, saravanan sekar wrote:
> >>> On 24/04/20 12:53 pm, Lee Jones wrote:
> >>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
> >>>>> On 24/04/20 11:37 am, Lee Jones wrote:
> >>>>>> On Fri, 24 Apr 2020, saravanan sekar wrote:

...

> >>>>>> Then how about using 'simple-mfd' and 'syscon'?
> >>>>>>
> >>>>>> Then you can omit this driver completely.
> >>>>> The exception is to support for non device tree platform as well,
> >>>>> but I have
> >>>>> tested only for ARM device tree platform.
> >>>> Is that a reality though?
> >>>>
> >>>> How else do you see this realistically being registered?
> >>>>
> >>> I understand that acpi related device table are not covered here,
> >>> well I
> >>> don't have to platform to test so.
> >>> If you ask me to cover acpi related table, I can do but hard to test.
> >> I don't know of any reasons why syscon can't be used by ACPI.
> >>
> >> Please try to solve this issue using 'simple-mfd' and 'syscon'.
> > Well the simple-mfd and syscon topic recommended by you when Device
> > tree alone is used.
> > I wounder still I receive review/improvements comments for this mfd
> > patch and also another
> > to omit this driver using simple-mfd (rework the series).
> > Confused, not sure which is valid and will be accepted at the end.
>
> I had look into syscon, as far my understanding syscon is supported only
> for memory mapped IO. MP2629
> device is over I2C bus, could you share your thought about syscon for
> this device?

My understanding too, but I didn't dug into it.
Something like general regmap support is missing (or I am missing the
way how to pass it to syscon).

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

[Lee Jones]

On Wed, 15 Apr 2020, Saravanan Sekar wrote:

> mp2629 is a highly-integrated switching-mode battery charge management
> device for single-cell Li-ion or Li-polymer battery.
> 
> Add MFD core enables chip access for ADC driver for battery readings,
> and a power supply battery-charger driver
> 
> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> ---
>  drivers/mfd/Kconfig        |  9 ++++
>  drivers/mfd/Makefile       |  2 +
>  drivers/mfd/mp2629.c       | 86 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/mp2629.h | 19 +++++++++
>  4 files changed, 116 insertions(+)
>  create mode 100644 drivers/mfd/mp2629.c
>  create mode 100644 include/linux/mfd/mp2629.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3c547ed575e6..85be799795aa 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
>  	help
>  	  Select this if your MC13xxx is connected via an I2C bus.
>  
> +config MFD_MP2629
> +	tristate "Monolithic power system MP2629 ADC and Battery charger"

"Power Systems"

> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	  Select this option to enable support for monolithic power system

"Monolithic Power Systems"

> +	  battery charger. This provides ADC, thermal, battery charger power

"thermal and battery"

> +	  management functions on the systems.

What does "on the systems" mean?

I would just drop that part.

>  config MFD_MXS_LRADC
>  	tristate "Freescale i.MX23/i.MX28 LRADC"
>  	depends on ARCH_MXS || COMPILE_TEST
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f935d10cbf0f..d6c210f96d02 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -170,6 +170,8 @@ obj-$(CONFIG_MFD_MAX8925)	+= max8925.o
>  obj-$(CONFIG_MFD_MAX8997)	+= max8997.o max8997-irq.o
>  obj-$(CONFIG_MFD_MAX8998)	+= max8998.o max8998-irq.o
>  
> +obj-$(CONFIG_MFD_MP2629)	+= mp2629.o
> +
>  pcf50633-objs			:= pcf50633-core.o pcf50633-irq.o
>  obj-$(CONFIG_MFD_PCF50633)	+= pcf50633.o
>  obj-$(CONFIG_PCF50633_ADC)	+= pcf50633-adc.o
> diff --git a/drivers/mfd/mp2629.c b/drivers/mfd/mp2629.c
> new file mode 100644
> index 000000000000..46242b1cdf24
> --- /dev/null
> +++ b/drivers/mfd/mp2629.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * MP2629 parent driver for ADC and battery charger
> + *
> + * Copyright 2020 Monolithic Power Systems, Inc
> + *
> + * Author: Saravanan Sekar <sravanhome@gmail.com>
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/mp2629.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +enum {
> +	MP2629_MFD_ADC,
> +	MP2629_MFD_CHARGER,
> +	MP2629_MFD_MAX
> +};

Why do you need this?  I think it can be dropped.

> +static const struct mfd_cell mp2629mfd[] = {

Drop the "mfd" part of "mp2629mfd".

You can call it "mp2629_cell" if you like.

> +	[MP2629_MFD_ADC] = {
> +		.name = "mp2629_adc",
> +		.of_compatible = "mps,mp2629_adc",
> +	},
> +	[MP2629_MFD_CHARGER] = {
> +		.name = "mp2629_charger",
> +		.of_compatible = "mps,mp2629_charger",
> +	}
> +};
> +
> +static const struct regmap_config mp2629_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0x17,

Best to define the registers in an enum and call the last one
MP2629_MAX_REG or similar.

> +};
> +
> +static int mp2629_probe(struct i2c_client *client)
> +{
> +	struct mp2629_info *ddata;

Either change "info" to "ddata", or drop it completely.

> +	int ret;
> +
> +	ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
> +	if (!ddata)
> +		return -ENOMEM;
> +
> +	ddata->dev = &client->dev;
> +	i2c_set_clientdata(client, ddata);
> +
> +	ddata->regmap = devm_regmap_init_i2c(client, &mp2629_regmap_config);
> +	if (IS_ERR(ddata->regmap)) {
> +		dev_err(ddata->dev, "Failed to allocate regmap!\n");

No need for the exclamation mark.

> +		return PTR_ERR(ddata->regmap);
> +	}
> +
> +	ret = devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_NONE, mp2629mfd,

Why NONE over AUTO?

> +				ARRAY_SIZE(mp2629mfd), NULL,
> +				0, NULL);
> +	if (ret)
> +		dev_err(ddata->dev, "Failed to register sub-devices %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id mp2629_of_match[] = {
> +	{ .compatible = "mps,mp2629"},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, mp2629_of_match);
> +
> +static struct i2c_driver mp2629_driver = {
> +	.driver = {
> +		.name = "mp2629",
> +		.of_match_table = mp2629_of_match,
> +	},
> +	.probe_new	= mp2629_probe,
> +};
> +module_i2c_driver(mp2629_driver);
> +
> +MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
> +MODULE_DESCRIPTION("MP2629 Battery charger parent driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/mp2629.h b/include/linux/mfd/mp2629.h
> new file mode 100644
> index 000000000000..06985e41fc6f
> --- /dev/null
> +++ b/include/linux/mfd/mp2629.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * register definitions for MP2629 charger

"Register"

Although there aren't any register definitions in here?

> + * Copyright 2020 Monolithic Power Systems, Inc
> + */
> +
> +#ifndef __MP2629_H__
> +#define __MP2629_H__
> +
> +#include <linux/device.h>
> +#include <linux/regmap.h>
> +
> +struct mp2629_info {
> +	struct device *dev;
> +	struct regmap *regmap;
> +};
> +
> +#endif

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v9 3/6] iio: adc: mp2629: Add support for mp2629 ADC driver

[Saravanan Sekar]

Add support for 8-bit resolution ADC readings for input power
supply and battery charging measurement. Provides voltage, current
readings to mp2629 power supply driver.

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 drivers/iio/adc/Kconfig      |  10 ++
 drivers/iio/adc/Makefile     |   1 +
 drivers/iio/adc/mp2629_adc.c | 208 +++++++++++++++++++++++++++++++++++
 include/linux/mfd/mp2629.h   |   9 ++
 4 files changed, 228 insertions(+)
 create mode 100644 drivers/iio/adc/mp2629_adc.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 82e33082958c..ef0c0cd31855 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -680,6 +680,16 @@ config MESON_SARADC
 	  To compile this driver as a module, choose M here: the
 	  module will be called meson_saradc.
 
+config MP2629_ADC
+	tristate "Monolithic MP2629 ADC driver"
+	depends on MFD_MP2629
+	help
+	  Say yes to have support for battery charger IC MP2629 ADC device
+	  accessed over I2C.
+
+	  This driver provides ADC conversion of system, input power supply
+	  and battery voltage & current information.
+
 config NAU7802
 	tristate "Nuvoton NAU7802 ADC driver"
 	depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 919228900df9..f14416c245a6 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_MCP3911) += mcp3911.o
 obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
 obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
 obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
+obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o
 obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
 obj-$(CONFIG_NAU7802) += nau7802.o
 obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
diff --git a/drivers/iio/adc/mp2629_adc.c b/drivers/iio/adc/mp2629_adc.c
new file mode 100644
index 000000000000..faf389f32729
--- /dev/null
+++ b/drivers/iio/adc/mp2629_adc.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MP2629 Driver for ADC
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@gmail.com>
+ */
+
+#include <linux/iio/driver.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+#include <linux/mfd/mp2629.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define	MP2629_REG_ADC_CTRL		0x03
+#define	MP2629_REG_BATT_VOLT		0x0e
+#define	MP2629_REG_SYSTEM_VOLT		0x0f
+#define	MP2629_REG_INPUT_VOLT		0x11
+#define	MP2629_REG_BATT_CURRENT		0x12
+#define	MP2629_REG_INPUT_CURRENT	0x13
+
+#define	MP2629_ADC_START		BIT(7)
+#define	MP2629_ADC_CONTINUOUS		BIT(6)
+
+#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
+
+#define MP2629_ADC_CHAN(_ch, _type) {				\
+	.type = _type,						\
+	.indexed = 1,						\
+	.datasheet_name = #_ch,					\
+	.channel = MP2629_ ## _ch,				\
+	.address = MP2629_REG_ ## _ch,				\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+struct mp2629_adc {
+	struct regmap *regmap;
+	struct device *dev;
+};
+
+static struct iio_chan_spec mp2629_channels[] = {
+	MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
+	MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
+	MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
+	MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
+	MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
+};
+
+static struct iio_map mp2629_adc_maps[] = {
+	MP2629_MAP(BATT_VOLT, "batt-volt"),
+	MP2629_MAP(SYSTEM_VOLT, "system-volt"),
+	MP2629_MAP(INPUT_VOLT, "input-volt"),
+	MP2629_MAP(BATT_CURRENT, "batt-current"),
+	MP2629_MAP(INPUT_CURRENT, "input-current")
+};
+
+static int mp2629_read_raw(struct iio_dev *indio_dev,
+			struct iio_chan_spec const *chan,
+			int *val, int *val2, long mask)
+{
+	struct mp2629_adc *info = iio_priv(indio_dev);
+	unsigned int rval;
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = regmap_read(info->regmap, chan->address, &rval);
+		if (ret)
+			return ret;
+
+		if (chan->address == MP2629_INPUT_VOLT)
+			rval &= GENMASK(6, 0);
+		*val = rval;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel) {
+		case MP2629_BATT_VOLT:
+		case MP2629_SYSTEM_VOLT:
+			*val = 20;
+			return IIO_VAL_INT;
+
+		case MP2629_INPUT_VOLT:
+			*val = 60;
+			return IIO_VAL_INT;
+
+		case MP2629_BATT_CURRENT:
+			*val = 175;
+			*val2 = 10;
+			return IIO_VAL_FRACTIONAL;
+
+		case MP2629_INPUT_CURRENT:
+			*val = 133;
+			*val2 = 10;
+			return IIO_VAL_FRACTIONAL;
+
+		default:
+			return -EINVAL;
+		}
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info mp2629_adc_info = {
+	.read_raw = &mp2629_read_raw,
+};
+
+static int mp2629_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mp2629_info *ddata = dev_get_drvdata(dev->parent);
+	struct mp2629_adc *info;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	info = iio_priv(indio_dev);
+	info->regmap = ddata->regmap;
+	info->dev = dev;
+	platform_set_drvdata(pdev, indio_dev);
+
+	ret = regmap_update_bits(ddata->regmap, MP2629_REG_ADC_CTRL,
+				MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
+				MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
+	if (ret) {
+		dev_err(dev, "adc enable fail: %d\n", ret);
+		return ret;
+	}
+
+	ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
+	if (ret) {
+		dev_err(dev, "IIO maps register fail: %d\n", ret);
+		goto fail_disable;
+	}
+
+	indio_dev->name = "mp2629-adc";
+	indio_dev->dev.parent = dev;
+	indio_dev->channels = mp2629_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mp2629_adc_info;
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(dev, "IIO device register fail: %d\n", ret);
+		goto fail_map_unregister;
+	}
+
+	return 0;
+
+fail_map_unregister:
+	iio_map_array_unregister(indio_dev);
+
+fail_disable:
+	regmap_update_bits(ddata->regmap, MP2629_REG_ADC_CTRL,
+					 MP2629_ADC_CONTINUOUS, 0);
+	regmap_update_bits(ddata->regmap, MP2629_REG_ADC_CTRL,
+					 MP2629_ADC_START, 0);
+
+	return ret;
+}
+
+static int mp2629_adc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct mp2629_adc *info = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	iio_map_array_unregister(indio_dev);
+
+	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
+					 MP2629_ADC_CONTINUOUS, 0);
+	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
+					 MP2629_ADC_START, 0);
+
+	return 0;
+}
+
+static const struct of_device_id mp2629_adc_of_match[] = {
+	{ .compatible = "mps,mp2629_adc"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
+
+static struct platform_driver mp2629_adc_driver = {
+	.driver = {
+		.name = "mp2629_adc",
+		.of_match_table = mp2629_adc_of_match,
+	},
+	.probe		= mp2629_adc_probe,
+	.remove		= mp2629_adc_remove,
+};
+module_platform_driver(mp2629_adc_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
+MODULE_DESCRIPTION("MP2629 ADC driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/mp2629.h b/include/linux/mfd/mp2629.h
index 06985e41fc6f..83ebfab41691 100644
--- a/include/linux/mfd/mp2629.h
+++ b/include/linux/mfd/mp2629.h
@@ -16,4 +16,13 @@ struct mp2629_info {
 	struct regmap *regmap;
 };
 
+enum mp2629_adc_chan {
+	MP2629_BATT_VOLT,
+	MP2629_SYSTEM_VOLT,
+	MP2629_INPUT_VOLT,
+	MP2629_BATT_CURRENT,
+	MP2629_INPUT_CURRENT,
+	MP2629_ADC_CHAN_END
+};
+
 #endif
-- 
2.17.1

[PATCH v9 4/6] power: supply: Add support for mps mp2629 battery charger

[Saravanan Sekar]

The mp2629 provides switching-mode battery charge management for
single-cell Li-ion or Li-polymer battery. Driver supports the
access/control input source and battery charging parameters.

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 drivers/power/supply/Kconfig          |  10 +
 drivers/power/supply/Makefile         |   1 +
 drivers/power/supply/mp2629_charger.c | 667 ++++++++++++++++++++++++++
 3 files changed, 678 insertions(+)
 create mode 100644 drivers/power/supply/mp2629_charger.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f3424fdce341..05b3f66946ad 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -541,6 +541,16 @@ config CHARGER_MAX8998
 	  Say Y to enable support for the battery charger control sysfs and
 	  platform data of MAX8998/LP3974 PMICs.
 
+config CHARGER_MP2629
+	tristate "Monolithic power system MP2629 Battery charger"
+	depends on MFD_MP2629
+	depends on MP2629_ADC
+	depends on IIO
+	help
+	  Select this option to enable support for Monolithic power system
+	  Battery charger. This driver provies Battery charger power management
+	  functions on the systems.
+
 config CHARGER_QCOM_SMBB
 	tristate "Qualcomm Switch-Mode Battery Charger and Boost"
 	depends on MFD_SPMI_PMIC || COMPILE_TEST
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 6c7da920ea83..41cb64f09e49 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_CHARGER_MAX77650)	+= max77650-charger.o
 obj-$(CONFIG_CHARGER_MAX77693)	+= max77693_charger.o
 obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o
+obj-$(CONFIG_CHARGER_MP2629)	+= mp2629_charger.o
 obj-$(CONFIG_CHARGER_QCOM_SMBB)	+= qcom_smbb.o
 obj-$(CONFIG_CHARGER_BQ2415X)	+= bq2415x_charger.o
 obj-$(CONFIG_CHARGER_BQ24190)	+= bq24190_charger.o
diff --git a/drivers/power/supply/mp2629_charger.c b/drivers/power/supply/mp2629_charger.c
new file mode 100644
index 000000000000..e6889daaf7d6
--- /dev/null
+++ b/drivers/power/supply/mp2629_charger.c
@@ -0,0 +1,667 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MP2629 battery charger driver
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@gmail.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/iio/consumer.h>
+#include <linux/iio/types.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/mp2629.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+#define MP2629_REG_INPUT_ILIM		0x00
+#define MP2629_REG_INPUT_VLIM		0x01
+#define MP2629_REG_CHARGE_CTRL		0x04
+#define MP2629_REG_CHARGE_ILIM		0x05
+#define MP2629_REG_PRECHARGE		0x06
+#define MP2629_REG_TERM_CURRENT		0x06
+#define MP2629_REG_CHARGE_VLIM		0x07
+#define MP2629_REG_TIMER_CTRL		0x08
+#define MP2629_REG_IMPEDANCE_COMP	0x09
+#define MP2629_REG_INTERRUPT		0x0b
+#define MP2629_REG_STATUS		0x0c
+#define MP2629_REG_FAULT		0x0d
+
+#define MP2629_MASK_INPUT_TYPE		GENMASK(7, 5)
+#define MP2629_MASK_CHARGE_TYPE		GENMASK(4, 3)
+#define MP2629_MASK_CHARGE_CTRL		GENMASK(5, 4)
+#define MP2629_MASK_WDOG_CTRL		GENMASK(5, 4)
+#define MP2629_MASK_IMPEDANCE		GENMASK(7, 4)
+
+#define MP2629_INPUTSOURCE_CHANGE	GENMASK(7, 5)
+#define MP2629_CHARGING_CHANGE		GENMASK(4, 3)
+#define MP2629_FAULT_BATTERY		BIT(3)
+#define MP2629_FAULT_THERMAL		BIT(4)
+#define MP2629_FAULT_INPUT		BIT(5)
+#define MP2629_FAULT_OTG		BIT(6)
+
+#define MP2629_MAX_BATT_CAPACITY	100
+
+#define MP2629_PROPS(_idx, _min, _max, _step)		\
+	[_idx] = {					\
+		.min	= _min,				\
+		.max	= _max,				\
+		.step	= _step,			\
+}
+
+enum mp2629_source_type {
+	MP2629_SOURCE_TYPE_NO_INPUT,
+	MP2629_SOURCE_TYPE_NON_STD,
+	MP2629_SOURCE_TYPE_SDP,
+	MP2629_SOURCE_TYPE_CDP,
+	MP2629_SOURCE_TYPE_DCP,
+	MP2629_SOURCE_TYPE_OTG = 7,
+};
+
+enum mp2629_field {
+	INPUT_ILIM,
+	INPUT_VLIM,
+	CHARGE_ILIM,
+	CHARGE_VLIM,
+	PRECHARGE,
+	TERM_CURRENT,
+	MP2629_MAX_FIELD
+};
+
+struct mp2629_charger {
+	struct device *dev;
+	int status;
+	int fault;
+
+	struct regmap *regmap;
+	struct regmap_field *regmap_fields[MP2629_MAX_FIELD];
+	struct mutex lock;
+	struct power_supply *usb;
+	struct power_supply *battery;
+	struct iio_channel *iiochan[MP2629_ADC_CHAN_END];
+};
+
+struct mp2629_prop {
+	int reg;
+	int mask;
+	int min;
+	int max;
+	int step;
+	int shift;
+};
+
+static enum power_supply_usb_type mp2629_usb_types[] = {
+	POWER_SUPPLY_USB_TYPE_SDP,
+	POWER_SUPPLY_USB_TYPE_DCP,
+	POWER_SUPPLY_USB_TYPE_CDP,
+	POWER_SUPPLY_USB_TYPE_PD_DRP,
+	POWER_SUPPLY_USB_TYPE_UNKNOWN
+};
+
+static enum power_supply_property mp2629_charger_usb_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_USB_TYPE,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
+};
+
+static enum power_supply_property mp2629_charger_bat_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_CHARGE_TYPE,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+};
+
+static struct mp2629_prop props[] = {
+	MP2629_PROPS(INPUT_ILIM, 100000, 3250000, 50000),
+	MP2629_PROPS(INPUT_VLIM, 3800000, 5300000, 100000),
+	MP2629_PROPS(CHARGE_ILIM, 320000, 4520000, 40000),
+	MP2629_PROPS(CHARGE_VLIM, 3400000, 4670000, 10000),
+	MP2629_PROPS(PRECHARGE, 120000, 720000, 40000),
+	MP2629_PROPS(TERM_CURRENT, 80000, 680000, 40000),
+};
+
+static const struct reg_field mp2629_reg_fields[] = {
+	[INPUT_ILIM]	= REG_FIELD(MP2629_REG_INPUT_ILIM, 0, 5),
+	[INPUT_VLIM]	= REG_FIELD(MP2629_REG_INPUT_VLIM, 0, 3),
+	[CHARGE_ILIM]	= REG_FIELD(MP2629_REG_CHARGE_ILIM, 0, 6),
+	[CHARGE_VLIM]	= REG_FIELD(MP2629_REG_CHARGE_VLIM, 1, 7),
+	[PRECHARGE]	= REG_FIELD(MP2629_REG_PRECHARGE, 4, 7),
+	[TERM_CURRENT]	= REG_FIELD(MP2629_REG_TERM_CURRENT, 0, 3),
+};
+
+static char *adc_chan_name[] = {
+	"mp2629-batt-volt",
+	"mp2629-system-volt",
+	"mp2629-input-volt",
+	"mp2629-batt-current",
+	"mp2629-input-current",
+};
+
+static int mp2629_read_adc(struct mp2629_charger *charger,
+			   enum mp2629_adc_chan ch,
+			   union power_supply_propval *val)
+{
+	int ret;
+	int chval;
+
+	ret = iio_read_channel_processed(charger->iiochan[ch], &chval);
+	if (ret)
+		return ret;
+
+	val->intval = chval * 1000;
+
+	return 0;
+}
+
+static int mp2629_get_prop(struct mp2629_charger *charger,
+			   enum mp2629_field fld,
+			   union power_supply_propval *val)
+{
+	int ret;
+	unsigned int rval;
+
+	ret = regmap_field_read(charger->regmap_fields[fld], &rval);
+	if (ret)
+		return ret;
+
+	val->intval = rval * props[fld].step + props[fld].min;
+
+	return 0;
+}
+
+static int mp2629_set_prop(struct mp2629_charger *charger,
+			   enum mp2629_field fld,
+			   const union power_supply_propval *val)
+{
+	unsigned int rval;
+
+	if (val->intval < props[fld].min || val->intval > props[fld].max)
+		return -EINVAL;
+
+	rval = (val->intval - props[fld].min) / props[fld].step;
+	return regmap_field_write(charger->regmap_fields[fld], rval);
+}
+
+static int mp2629_get_battery_capacity(struct mp2629_charger *charger,
+				       union power_supply_propval *val)
+{
+	union power_supply_propval vnow, vlim;
+	int ret;
+
+	ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, &vnow);
+	if (ret)
+		return ret;
+
+	ret = mp2629_get_prop(charger, CHARGE_VLIM, &vlim);
+	if (ret)
+		return ret;
+
+	val->intval = (vnow.intval * 100) / vlim.intval;
+	val->intval = min(val->intval, MP2629_MAX_BATT_CAPACITY);
+
+	return 0;
+}
+
+static int mp2629_charger_battery_get_prop(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+	unsigned int rval;
+	int ret = 0;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		ret = mp2629_read_adc(charger, MP2629_BATT_CURRENT, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		val->intval = 4520000;
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		val->intval = 4670000;
+		break;
+
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = mp2629_get_battery_capacity(charger, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		ret = mp2629_get_prop(charger, TERM_CURRENT, val);
+		break;
+
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		ret = mp2629_get_prop(charger, PRECHARGE, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		ret = mp2629_get_prop(charger, CHARGE_VLIM, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		ret = mp2629_get_prop(charger, CHARGE_ILIM, val);
+		break;
+
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (!charger->fault)
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+		if (MP2629_FAULT_BATTERY & charger->fault)
+			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		else if (MP2629_FAULT_THERMAL & charger->fault)
+			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+		else if (MP2629_FAULT_INPUT & charger->fault)
+			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		break;
+
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+		if (ret)
+			break;
+
+		rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
+		switch (rval) {
+		case 0x00:
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			break;
+		case 0x01:
+		case 0x10:
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+		case 0x11:
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+		}
+		break;
+
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+		if (ret)
+			break;
+
+		rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
+		switch (rval) {
+		case 0x00:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+			break;
+		case 0x01:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+			break;
+		case 0x10:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
+		}
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int mp2629_charger_battery_set_prop(struct power_supply *psy,
+					enum power_supply_property psp,
+					const union power_supply_propval *val)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return mp2629_set_prop(charger, TERM_CURRENT, val);
+
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		return mp2629_set_prop(charger, PRECHARGE, val);
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		return mp2629_set_prop(charger, CHARGE_VLIM, val);
+
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return mp2629_set_prop(charger, CHARGE_ILIM, val);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mp2629_charger_usb_get_prop(struct power_supply *psy,
+				enum power_supply_property psp,
+				union power_supply_propval *val)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+	unsigned int rval;
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+		if (ret)
+			break;
+
+		val->intval = !!(rval & MP2629_MASK_INPUT_TYPE);
+		break;
+
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+		if (ret)
+			break;
+
+		rval = (rval & MP2629_MASK_INPUT_TYPE) >> 5;
+		switch (rval) {
+		case MP2629_SOURCE_TYPE_SDP:
+			val->intval = POWER_SUPPLY_USB_TYPE_SDP;
+			break;
+		case MP2629_SOURCE_TYPE_CDP:
+			val->intval = POWER_SUPPLY_USB_TYPE_CDP;
+			break;
+		case MP2629_SOURCE_TYPE_DCP:
+			val->intval = POWER_SUPPLY_USB_TYPE_DCP;
+			break;
+		case MP2629_SOURCE_TYPE_OTG:
+			val->intval = POWER_SUPPLY_USB_TYPE_PD_DRP;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+			break;
+		}
+		break;
+
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = mp2629_read_adc(charger, MP2629_INPUT_VOLT, val);
+		break;
+
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		ret = mp2629_read_adc(charger, MP2629_INPUT_CURRENT, val);
+		break;
+
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		ret = mp2629_get_prop(charger, INPUT_VLIM, val);
+		break;
+
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		ret = mp2629_get_prop(charger, INPUT_ILIM, val);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int mp2629_charger_usb_set_prop(struct power_supply *psy,
+				enum power_supply_property psp,
+				const union power_supply_propval *val)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		return mp2629_set_prop(charger, INPUT_VLIM, val);
+
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return mp2629_set_prop(charger, INPUT_ILIM, val);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mp2629_charger_battery_prop_writeable(struct power_supply *psy,
+				     enum power_supply_property psp)
+{
+	return (psp == POWER_SUPPLY_PROP_PRECHARGE_CURRENT) ||
+	       (psp == POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT) ||
+	       (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT) ||
+	       (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE);
+}
+
+static int mp2629_charger_usb_prop_writeable(struct power_supply *psy,
+				     enum power_supply_property psp)
+{
+	return (psp == POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT) ||
+	       (psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT);
+}
+
+static irqreturn_t mp2629_irq_handler(int irq, void *dev_id)
+{
+	struct mp2629_charger *charger = dev_id;
+	unsigned int rval;
+	int ret;
+
+	mutex_lock(&charger->lock);
+
+	ret = regmap_read(charger->regmap, MP2629_REG_FAULT, &rval);
+	if (ret)
+		goto unlock;
+
+	if (rval) {
+		charger->fault = rval;
+		if (MP2629_FAULT_BATTERY & rval)
+			dev_err(charger->dev, "Battery fault OVP");
+		else if (MP2629_FAULT_THERMAL & rval)
+			dev_err(charger->dev, "Thermal shutdown fault");
+		else if (MP2629_FAULT_INPUT & rval)
+			dev_err(charger->dev, "no input or input OVP");
+		else if (MP2629_FAULT_OTG & rval)
+			dev_err(charger->dev, "VIN overloaded");
+
+		goto unlock;
+	}
+
+	ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+	if (ret)
+		goto unlock;
+
+	if (rval & MP2629_INPUTSOURCE_CHANGE)
+		power_supply_changed(charger->usb);
+	else if (rval & MP2629_CHARGING_CHANGE)
+		power_supply_changed(charger->battery);
+
+unlock:
+	mutex_unlock(&charger->lock);
+
+	return IRQ_HANDLED;
+}
+
+static const struct power_supply_desc mp2629_usb_desc = {
+	.name		= "mp2629_usb",
+	.type		= POWER_SUPPLY_TYPE_USB,
+	.usb_types      = mp2629_usb_types,
+	.num_usb_types  = ARRAY_SIZE(mp2629_usb_types),
+	.properties	= mp2629_charger_usb_props,
+	.num_properties	= ARRAY_SIZE(mp2629_charger_usb_props),
+	.get_property	= mp2629_charger_usb_get_prop,
+	.set_property	= mp2629_charger_usb_set_prop,
+	.property_is_writeable = mp2629_charger_usb_prop_writeable,
+};
+
+static const struct power_supply_desc mp2629_battery_desc = {
+	.name		= "mp2629_battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= mp2629_charger_bat_props,
+	.num_properties	= ARRAY_SIZE(mp2629_charger_bat_props),
+	.get_property	= mp2629_charger_battery_get_prop,
+	.set_property	= mp2629_charger_battery_set_prop,
+	.property_is_writeable = mp2629_charger_battery_prop_writeable,
+};
+
+static ssize_t batt_impedance_compensation_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
+	unsigned int rval;
+	int ret;
+
+	ret = regmap_read(charger->regmap, MP2629_REG_IMPEDANCE_COMP, &rval);
+	if (ret)
+		return ret;
+
+	rval = (rval >> 4) * 10;
+	return sprintf(buf, "%d mohm\n", rval);
+}
+
+static ssize_t batt_impedance_compensation_store(struct device *dev,
+					    struct device_attribute *attr,
+					    const char *buf,
+					    size_t count)
+{
+	struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
+	unsigned int val;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	if (val > 140)
+		return -ERANGE;
+
+	/* multiples of 10 mohm so round off */
+	val = val / 10;
+	ret = regmap_update_bits(charger->regmap, MP2629_REG_IMPEDANCE_COMP,
+					MP2629_MASK_IMPEDANCE, val << 4);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(batt_impedance_compensation);
+
+static struct attribute *mp2629_charger_sysfs_attrs[] = {
+	&dev_attr_batt_impedance_compensation.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(mp2629_charger_sysfs);
+
+static int mp2629_charger_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mp2629_info *ddata = dev_get_drvdata(dev->parent);
+	struct mp2629_charger *charger;
+	struct power_supply_config psy_cfg = {};
+	int ret, i, irq;
+
+	charger = devm_kzalloc(dev, sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	charger->regmap = ddata->regmap;
+	charger->dev = dev;
+	platform_set_drvdata(pdev, charger);
+
+	irq = platform_get_irq_optional(to_platform_device(dev->parent), 0);
+	if (irq < 0) {
+		dev_err(dev, "get irq fail: %d\n", irq);
+		return irq;
+	}
+
+	for (i = 0; i < MP2629_MAX_FIELD; i++) {
+		charger->regmap_fields[i] = devm_regmap_field_alloc(dev,
+					charger->regmap, mp2629_reg_fields[i]);
+		if (IS_ERR(charger->regmap_fields[i])) {
+			dev_err(dev, "regmap field alloc fail %d\n", i);
+			return PTR_ERR(charger->regmap_fields[i]);
+		}
+	}
+
+	for (i = 0; i < MP2629_ADC_CHAN_END; i++) {
+		charger->iiochan[i] = devm_iio_channel_get(dev,
+							adc_chan_name[i]);
+		if (IS_ERR(charger->iiochan[i])) {
+			dev_err(dev, "iio chan get %s err\n", adc_chan_name[i]);
+			return PTR_ERR(charger->iiochan[i]);
+		}
+	}
+
+	charger->usb = devm_power_supply_register(dev, &mp2629_usb_desc, NULL);
+	if (IS_ERR(charger->usb)) {
+		dev_err(dev, "power supply register usb failed\n");
+		return PTR_ERR(charger->usb);
+	}
+
+	psy_cfg.drv_data = charger;
+	psy_cfg.attr_grp = mp2629_charger_sysfs_groups;
+	charger->battery = devm_power_supply_register(dev,
+					 &mp2629_battery_desc, &psy_cfg);
+	if (IS_ERR(charger->battery)) {
+		dev_err(dev, "power supply register battery failed\n");
+		return PTR_ERR(charger->battery);
+	}
+
+	ret = regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
+					MP2629_MASK_CHARGE_CTRL, BIT(4));
+	if (ret) {
+		dev_err(dev, "enable charge fail: %d\n", ret);
+		return ret;
+	}
+
+	regmap_update_bits(charger->regmap, MP2629_REG_TIMER_CTRL,
+					MP2629_MASK_WDOG_CTRL, 0);
+
+	mutex_init(&charger->lock);
+
+	ret = devm_request_threaded_irq(dev, irq, NULL,	mp2629_irq_handler,
+					IRQF_ONESHOT | IRQF_TRIGGER_RISING,
+					"mp2629-charger", charger);
+	if (ret) {
+		dev_err(dev, "failed to request gpio IRQ\n");
+		return ret;
+	}
+
+	regmap_update_bits(charger->regmap, MP2629_REG_INTERRUPT,
+				GENMASK(6, 5), BIT(6) | BIT(5));
+
+	return 0;
+}
+
+static int mp2629_charger_remove(struct platform_device *pdev)
+{
+	struct mp2629_charger *charger = platform_get_drvdata(pdev);
+
+	regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
+					MP2629_MASK_CHARGE_CTRL, 0);
+	return 0;
+}
+
+static const struct of_device_id mp2629_charger_of_match[] = {
+	{ .compatible = "mps,mp2629_charger"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, mp2629_charger_of_match);
+
+static struct platform_driver mp2629_charger_driver = {
+	.driver = {
+		.name = "mp2629_charger",
+		.of_match_table = mp2629_charger_of_match,
+	},
+	.probe		= mp2629_charger_probe,
+	.remove		= mp2629_charger_remove,
+};
+module_platform_driver(mp2629_charger_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
+MODULE_DESCRIPTION("MP2629 Charger driver");
+MODULE_LICENSE("GPL");
-- 
2.17.1

[PATCH v9 5/6] power: supply: mp2629: Add impedance compenstation config

[Saravanan Sekar]

Allows the user to compensate the intrinsic resistance of the battery
to accelerate the charging cycle.

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 Documentation/ABI/testing/sysfs-class-power-mp2629 | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-power-mp2629

diff --git a/Documentation/ABI/testing/sysfs-class-power-mp2629 b/Documentation/ABI/testing/sysfs-class-power-mp2629
new file mode 100644
index 000000000000..7b7c0e7a7c45
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-power-mp2629
@@ -0,0 +1,8 @@
+What:		/sys/class/power_supply/mp2629_battery/batt_impedance_compen
+Date:		April 2020
+KernelVersion:	5.7
+Description:
+		Represents a battery impedance compenstation to accelerate charging.
+
+                Access: Read, Write
+                Valid values: Represented in milli-ohms. Valid range is [0, 140].
-- 
2.17.1

[PATCH v9 6/6] MAINTAINERS: Add entry for mp2629 Battery Charger driver

[Saravanan Sekar]

Add MAINTAINERS entry for Monolithic Power Systems mp2629 Charger driver.

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
 MAINTAINERS | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 32a95d162f06..0f82d5a7a614 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11358,10 +11358,15 @@ F:	drivers/tty/mxser.*
 MONOLITHIC POWER SYSTEM PMIC DRIVER
 M:	Saravanan Sekar <sravanhome@gmail.com>
 S:	Maintained
+F:	Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
 F:	Documentation/devicetree/bindings/regulator/mps,mp*.yaml
+F:	drivers/iio/adc/mp2629_adc.c
+F:	drivers/mfd/mp2629.c
+F:	drivers/power/supply/mp2629_charger.c
 F:	drivers/regulator/mp5416.c
 F:	drivers/regulator/mpq7920.c
 F:	drivers/regulator/mpq7920.h
+F:	include/linux/mfd/mp2629.h
 
 MR800 AVERMEDIA USB FM RADIO DRIVER
 M:	Alexey Klimov <klimov.linux@gmail.com>
-- 
2.17.1

Re: [PATCH v9 0/6] Add battery charger driver support for MP2629

[Andy Shevchenko]

On Wed, Apr 15, 2020 at 7:20 PM Saravanan Sekar <sravanhome@gmail.com> wrote:
>
> changes in v9:
>  - fixed review comments in mp2629 power supply such as resource based
>    iio channel, replace workqueue by threaded irq, irq get with "_optional"
>

May I ask you why you are ignoring my tag?
If you don't want to have your patches reviewed / applied, just don't send them.

> changes in v8:
>  - fixed order of call in probe/remove in iio adc
>  - add ABI documentation for mp2629 power supply
>
> changes in v7:
>  - fixed probe/remove order, managed and unmanaged call mix use in adc.
>  - Documentation dual license, i2c node with controller address
>
> Overall looks good to me, FWIW,
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>
> One question though in reply to patch 4.
>
> changes in v6:
>  - removed includes types.h in mfd, of_device.h in adc.
>  - fixed review comments parentheses, err check, kstrtouint
>
> changes in v5:
>  - removed platfrom data stored in mfd and directly accessed mfd struct in child
>  - fixed spell check and capitalization in mfd and documentation
>
> changes in v4:
>  - fixed capitalization in mfg Kconfig and documentation
>
> changes in v3:
>  - regmap for children passed using platform data and remove mfd driver info
>    access directly from children
>
> changes in v2:
>  - removed EXPORT_SYMBOL of register set/get helper
>  - regmap bit filed used, fixed other review comments
>
> This patch series add support for Battery charger control driver for Monolithic
> Power System's MP2629 chipset, includes MFD driver for ADC battery & input
> power supply measurement and battery charger control driver.
>
> Thanks,
> Saravanan
>
> Saravanan Sekar (6):
>   dt-bindings: mfd: add document bindings for mp2629
>   mfd: mp2629: Add support for mps battery charger
>   iio: adc: mp2629: Add support for mp2629 ADC driver
>   power: supply: Add support for mps mp2629 battery charger
>   power: supply: mp2629: Add impedance compenstation config
>   MAINTAINERS: Add entry for mp2629 Battery Charger driver
>
>  .../ABI/testing/sysfs-class-power-mp2629      |   8 +
>  .../devicetree/bindings/mfd/mps,mp2629.yaml   |  60 ++
>  MAINTAINERS                                   |   5 +
>  drivers/iio/adc/Kconfig                       |  10 +
>  drivers/iio/adc/Makefile                      |   1 +
>  drivers/iio/adc/mp2629_adc.c                  | 208 ++++++
>  drivers/mfd/Kconfig                           |   9 +
>  drivers/mfd/Makefile                          |   2 +
>  drivers/mfd/mp2629.c                          |  86 +++
>  drivers/power/supply/Kconfig                  |  10 +
>  drivers/power/supply/Makefile                 |   1 +
>  drivers/power/supply/mp2629_charger.c         | 667 ++++++++++++++++++
>  include/linux/mfd/mp2629.h                    |  28 +
>  13 files changed, 1095 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-class-power-mp2629
>  create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
>  create mode 100644 drivers/iio/adc/mp2629_adc.c
>  create mode 100644 drivers/mfd/mp2629.c
>  create mode 100644 drivers/power/supply/mp2629_charger.c
>  create mode 100644 include/linux/mfd/mp2629.h
>
> --
> 2.17.1
>


-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v9 0/6] Add battery charger driver support for MP2629

[saravanan sekar]

Hi Andy,

On 15/04/20 6:40 pm, Andy Shevchenko wrote:
> On Wed, Apr 15, 2020 at 7:20 PM Saravanan Sekar <sravanhome@gmail.com> wrote:
>> changes in v9:
>>   - fixed review comments in mp2629 power supply such as resource based
>>     iio channel, replace workqueue by threaded irq, irq get with "_optional"
>>
> May I ask you why you are ignoring my tag?
> If you don't want to have your patches reviewed / applied, just don't send them.


Sorry last time it was by mistake. But now I have added in below, if 
suppose to added in top its my ignorance

>
>> changes in v8:
>>   - fixed order of call in probe/remove in iio adc
>>   - add ABI documentation for mp2629 power supply
>>
>> changes in v7:
>>   - fixed probe/remove order, managed and unmanaged call mix use in adc.
>>   - Documentation dual license, i2c node with controller address
>>
>> Overall looks good to me, FWIW,
>> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>>
>> One question though in reply to patch 4.


Please see here, this is first experience of tag in cover letter so just 
kept here as you gave against v7

>>
>> changes in v6:
>>   - removed includes types.h in mfd, of_device.h in adc.
>>   - fixed review comments parentheses, err check, kstrtouint
>>
>> changes in v5:
>>   - removed platfrom data stored in mfd and directly accessed mfd struct in child
>>   - fixed spell check and capitalization in mfd and documentation
>>
>> changes in v4:
>>   - fixed capitalization in mfg Kconfig and documentation
>>
>> changes in v3:
>>   - regmap for children passed using platform data and remove mfd driver info
>>     access directly from children
>>
>> changes in v2:
>>   - removed EXPORT_SYMBOL of register set/get helper
>>   - regmap bit filed used, fixed other review comments
>>
>> This patch series add support for Battery charger control driver for Monolithic
>> Power System's MP2629 chipset, includes MFD driver for ADC battery & input
>> power supply measurement and battery charger control driver.
>>
>> Thanks,
>> Saravanan
>>
>> Saravanan Sekar (6):
>>    dt-bindings: mfd: add document bindings for mp2629
>>    mfd: mp2629: Add support for mps battery charger
>>    iio: adc: mp2629: Add support for mp2629 ADC driver
>>    power: supply: Add support for mps mp2629 battery charger
>>    power: supply: mp2629: Add impedance compenstation config
>>    MAINTAINERS: Add entry for mp2629 Battery Charger driver
>>
>>   .../ABI/testing/sysfs-class-power-mp2629      |   8 +
>>   .../devicetree/bindings/mfd/mps,mp2629.yaml   |  60 ++
>>   MAINTAINERS                                   |   5 +
>>   drivers/iio/adc/Kconfig                       |  10 +
>>   drivers/iio/adc/Makefile                      |   1 +
>>   drivers/iio/adc/mp2629_adc.c                  | 208 ++++++
>>   drivers/mfd/Kconfig                           |   9 +
>>   drivers/mfd/Makefile                          |   2 +
>>   drivers/mfd/mp2629.c                          |  86 +++
>>   drivers/power/supply/Kconfig                  |  10 +
>>   drivers/power/supply/Makefile                 |   1 +
>>   drivers/power/supply/mp2629_charger.c         | 667 ++++++++++++++++++
>>   include/linux/mfd/mp2629.h                    |  28 +
>>   13 files changed, 1095 insertions(+)
>>   create mode 100644 Documentation/ABI/testing/sysfs-class-power-mp2629
>>   create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
>>   create mode 100644 drivers/iio/adc/mp2629_adc.c
>>   create mode 100644 drivers/mfd/mp2629.c
>>   create mode 100644 drivers/power/supply/mp2629_charger.c
>>   create mode 100644 include/linux/mfd/mp2629.h
>>
>> --
>> 2.17.1
>>
>

Re: [PATCH v9 0/6] Add battery charger driver support for MP2629

[Andy Shevchenko]

On Wed, Apr 15, 2020 at 7:53 PM saravanan sekar <sravanhome@gmail.com> wrote:
>
> Hi Andy,
>
> On 15/04/20 6:40 pm, Andy Shevchenko wrote:
> > On Wed, Apr 15, 2020 at 7:20 PM Saravanan Sekar <sravanhome@gmail.com> wrote:
> >> changes in v9:
> >>   - fixed review comments in mp2629 power supply such as resource based
> >>     iio channel, replace workqueue by threaded irq, irq get with "_optional"
> >>
> > May I ask you why you are ignoring my tag?
> > If you don't want to have your patches reviewed / applied, just don't send them.
>
>
> Sorry last time it was by mistake. But now I have added in below, if
> suppose to added in top its my ignorance

Ah, I see now. The idea of the tag given against cover letter that it
applies to entire series (if doesn't say otherwise).
It means, if you don't do any (drastic) changes to the patches, the
tag is still valid and you simple add it to each patch in the series
inside the commit message (usually after your SoB tag).

> >> changes in v8:
> >>   - fixed order of call in probe/remove in iio adc
> >>   - add ABI documentation for mp2629 power supply
> >>
> >> changes in v7:
> >>   - fixed probe/remove order, managed and unmanaged call mix use in adc.
> >>   - Documentation dual license, i2c node with controller address
> >>
> >> Overall looks good to me, FWIW,
> >> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> >>
> >> One question though in reply to patch 4.
>
>
> Please see here, this is first experience of tag in cover letter so just
> kept here as you gave against v7
>
> >>
> >> changes in v6:
> >>   - removed includes types.h in mfd, of_device.h in adc.
> >>   - fixed review comments parentheses, err check, kstrtouint
> >>
> >> changes in v5:
> >>   - removed platfrom data stored in mfd and directly accessed mfd struct in child
> >>   - fixed spell check and capitalization in mfd and documentation
> >>
> >> changes in v4:
> >>   - fixed capitalization in mfg Kconfig and documentation
> >>
> >> changes in v3:
> >>   - regmap for children passed using platform data and remove mfd driver info
> >>     access directly from children
> >>
> >> changes in v2:
> >>   - removed EXPORT_SYMBOL of register set/get helper
> >>   - regmap bit filed used, fixed other review comments
> >>
> >> This patch series add support for Battery charger control driver for Monolithic
> >> Power System's MP2629 chipset, includes MFD driver for ADC battery & input
> >> power supply measurement and battery charger control driver.
> >>
> >> Thanks,
> >> Saravanan
> >>
> >> Saravanan Sekar (6):
> >>    dt-bindings: mfd: add document bindings for mp2629
> >>    mfd: mp2629: Add support for mps battery charger
> >>    iio: adc: mp2629: Add support for mp2629 ADC driver
> >>    power: supply: Add support for mps mp2629 battery charger
> >>    power: supply: mp2629: Add impedance compenstation config
> >>    MAINTAINERS: Add entry for mp2629 Battery Charger driver
> >>
> >>   .../ABI/testing/sysfs-class-power-mp2629      |   8 +
> >>   .../devicetree/bindings/mfd/mps,mp2629.yaml   |  60 ++
> >>   MAINTAINERS                                   |   5 +
> >>   drivers/iio/adc/Kconfig                       |  10 +
> >>   drivers/iio/adc/Makefile                      |   1 +
> >>   drivers/iio/adc/mp2629_adc.c                  | 208 ++++++
> >>   drivers/mfd/Kconfig                           |   9 +
> >>   drivers/mfd/Makefile                          |   2 +
> >>   drivers/mfd/mp2629.c                          |  86 +++
> >>   drivers/power/supply/Kconfig                  |  10 +
> >>   drivers/power/supply/Makefile                 |   1 +
> >>   drivers/power/supply/mp2629_charger.c         | 667 ++++++++++++++++++
> >>   include/linux/mfd/mp2629.h                    |  28 +
> >>   13 files changed, 1095 insertions(+)
> >>   create mode 100644 Documentation/ABI/testing/sysfs-class-power-mp2629
> >>   create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> >>   create mode 100644 drivers/iio/adc/mp2629_adc.c
> >>   create mode 100644 drivers/mfd/mp2629.c
> >>   create mode 100644 drivers/power/supply/mp2629_charger.c
> >>   create mode 100644 include/linux/mfd/mp2629.h
> >>
> >> --
> >> 2.17.1
> >>
> >



-- 
With Best Regards,
Andy Shevchenko