linux-kernel - Re: [PATCH v6 6/9] mfd: axp20x: Add support for RSB based AXP223 PMIC

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Message-ID: <CAGb2v67N_C5bLTPmQs2gcTkpYt=2=Dk8LjWLEzHqGU--qhu+9g@mail.gmail.com>
Date:	Mon, 11 Jan 2016 19:58:20 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Mark Brown <broonie@...nel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v6 6/9] mfd: axp20x: Add support for RSB based AXP223 PMIC

On Mon, Jan 11, 2016 at 5:24 PM, Lee Jones <lee.jones@...aro.org> wrote:
> On Thu, 17 Dec 2015, Chen-Yu Tsai wrote:
>
>> The AXP223 is a new PMIC commonly paired with Allwinner A23/A33 SoCs.
>> It is functionally identical to AXP221; only the regulator default
>> voltage/status and the external host interface are different.
>>
>> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
>> ---
>>  drivers/mfd/Kconfig        | 11 +++++++
>>  drivers/mfd/Makefile       |  1 +
>>  drivers/mfd/axp20x-rsb.c   | 78 ++++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/mfd/axp20x.c       |  2 ++
>>  include/linux/mfd/axp20x.h |  1 +
>>  5 files changed, 93 insertions(+)
>>  create mode 100644 drivers/mfd/axp20x-rsb.c
>>
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>> index 804cd3dcce32..13c565103e96 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -107,6 +107,17 @@ config MFD_AXP20X_I2C
>>         components like regulators or the PEK (Power Enable Key) under the
>>         corresponding menus.
>>
>> +config MFD_AXP20X_RSB
>> +     tristate "X-Powers AXP series PMICs with RSB"
>> +     select MFD_AXP20X
>> +     depends on SUNXI_RSB
>> +     help
>> +       If you say Y here you get support for the X-Powers AXP series power
>> +       management ICs (PMICs) controlled with RSB.
>> +       This driver include only the core APIs. You have to select individual
>> +       components like regulators or the PEK (Power Enable Key) under the
>> +       corresponding menus.
>> +
>>  config MFD_CROS_EC
>>       tristate "ChromeOS Embedded Controller"
>>       select MFD_CORE
>> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
>> index a6913007d667..caea6637d5e8 100644
>> --- a/drivers/mfd/Makefile
>> +++ b/drivers/mfd/Makefile
>> @@ -108,6 +108,7 @@ obj-$(CONFIG_MFD_DA9052_SPI)      += da9052-spi.o
>>  obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o
>>  obj-$(CONFIG_MFD_AXP20X)     += axp20x.o
>>  obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o
>> +obj-$(CONFIG_MFD_AXP20X_RSB) += axp20x-rsb.o
>>
>>  obj-$(CONFIG_MFD_LP3943)     += lp3943.o
>>  obj-$(CONFIG_MFD_LP8788)     += lp8788.o lp8788-irq.o
>> diff --git a/drivers/mfd/axp20x-rsb.c b/drivers/mfd/axp20x-rsb.c
>> new file mode 100644
>> index 000000000000..76ff02b96df0
>> --- /dev/null
>> +++ b/drivers/mfd/axp20x-rsb.c
>> @@ -0,0 +1,78 @@
>> +/*
>> + * axp20x-rsb.c - RSB driver for the X-Powers' Power Management ICs
>
> Please remove the name of the file from the header.
>
> They have a habit of becoming out of date.

OK.

>> + * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
>> + * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
>> + * as well as configurable GPIOs.
>> + *
>> + * This driver supports the RSB variants.
>
> No copyright line?

Missed it. Will add it in the next version.

>> + * Author: Chen-Yu Tsai <wens@...e.org>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/err.h>
>> +#include <linux/module.h>
>> +#include <linux/mfd/axp20x.h>
>
> 'f' comes before 'o'.

Right.

>> +#include <linux/of.h>
>> +#include <linux/regmap.h>
>> +#include <linux/slab.h>
>> +#include <linux/sunxi-rsb.h>
>> +
>> +static int axp20x_rsb_probe(struct sunxi_rsb_device *rdev)
>> +{
>> +     struct axp20x_dev *axp20x;
>> +     int ret;
>> +
>> +     axp20x = devm_kzalloc(&rdev->dev, sizeof(*axp20x), GFP_KERNEL);
>> +     if (!axp20x)
>> +             return -ENOMEM;
>> +
>> +     axp20x->dev = &rdev->dev;
>> +     axp20x->irq = rdev->irq;
>> +     sunxi_rsb_device_set_drvdata(rdev, axp20x);
>
> What's the point of this call?  Why do you need a sunxi_ variant?

This is an inline call defined in include/linux/sunxi-rsb.h,
which is equivalent to dev_set_drvdata(&rdev->dev, data).

It seems many subsystems or bus drivers have this pattern.

    git grep void.*_set_drvdata include/linux/ | wc -l

yields 34, not including dev_set_drvdata itself and this sunxi_rsb
variant.

Thanks for the review!


Regards
ChenYu

>> +     ret = axp20x_match_device(axp20x);
>> +     if (ret)
>> +             return ret;
>> +
>> +     axp20x->regmap = devm_regmap_init_sunxi_rsb(rdev, axp20x->regmap_cfg);
>> +     if (IS_ERR(axp20x->regmap)) {
>> +             ret = PTR_ERR(axp20x->regmap);
>> +             dev_err(&rdev->dev, "regmap init failed: %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     return axp20x_device_probe(axp20x);
>> +}
>> +
>> +static int axp20x_rsb_remove(struct sunxi_rsb_device *rdev)
>> +{
>> +     struct axp20x_dev *axp20x = sunxi_rsb_device_get_drvdata(rdev);
>> +
>> +     return axp20x_device_remove(axp20x);
>> +}
>> +
>> +static const struct of_device_id axp20x_rsb_of_match[] = {
>> +     { .compatible = "x-powers,axp223", .data = (void *)AXP223_ID },
>> +     { },
>> +};
>> +MODULE_DEVICE_TABLE(of, axp20x_rsb_of_match);
>> +
>> +static struct sunxi_rsb_driver axp20x_rsb_driver = {
>> +     .driver = {
>> +             .name   = "axp20x-rsb",
>> +             .of_match_table = of_match_ptr(axp20x_rsb_of_match),
>> +     },
>> +     .probe  = axp20x_rsb_probe,
>> +     .remove = axp20x_rsb_remove,
>> +};
>> +module_sunxi_rsb_driver(axp20x_rsb_driver);
>> +
>> +MODULE_DESCRIPTION("PMIC MFD sunXi RSB driver for AXP20X");
>> +MODULE_AUTHOR("Chen-Yu Tsai <wens@...e.org>");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
>> index 54a00168da26..968d77fb95d8 100644
>> --- a/drivers/mfd/axp20x.c
>> +++ b/drivers/mfd/axp20x.c
>> @@ -33,6 +33,7 @@ static const char * const axp20x_model_names[] = {
>>       "AXP202",
>>       "AXP209",
>>       "AXP221",
>> +     "AXP223",
>>       "AXP288",
>>  };
>>
>> @@ -616,6 +617,7 @@ int axp20x_match_device(struct axp20x_dev *axp20x)
>>               axp20x->regmap_irq_chip = &axp20x_regmap_irq_chip;
>>               break;
>>       case AXP221_ID:
>> +     case AXP223_ID:
>>               axp20x->nr_cells = ARRAY_SIZE(axp22x_cells);
>>               axp20x->cells = axp22x_cells;
>>               axp20x->regmap_cfg = &axp22x_regmap_config;
>> diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
>> index 00697c6ad8b0..d82e7d51372b 100644
>> --- a/include/linux/mfd/axp20x.h
>> +++ b/include/linux/mfd/axp20x.h
>> @@ -18,6 +18,7 @@ enum {
>>       AXP202_ID,
>>       AXP209_ID,
>>       AXP221_ID,
>> +     AXP223_ID,
>>       AXP288_ID,
>>       NR_AXP20X_VARIANTS,
>>  };
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
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