Message-ID: <20150216135155.GI14545@x1>
Date:	Mon, 16 Feb 2015 13:51:55 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Jaewon Kim <jaewon02.kim@...sung.com>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org, Inki Dae <inki.dae@...sung.com>,
	SangBae Lee <sangbae90.lee@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Sebastian Reichel <sre@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Beomho Seo <beomho.seo@...sung.com>
Subject: Re: [PATCH v3 1/6] mfd: max77843: Add max77843 MFD driver core driver

On Wed, 04 Feb 2015, Jaewon Kim wrote:

> This patch adds MAX77843 core/irq driver to support PMIC,
> MUIC(Micro USB Interface Controller), Charger, Fuel Gauge,
> LED and Haptic device.
> 
> Cc: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Jaewon Kim <jaewon02.kim@...sung.com>
> Signed-off-by: Beomho Seo <beomho.seo@...sung.com>
> ---
>  drivers/mfd/Kconfig                  |   14 ++
>  drivers/mfd/Makefile                 |    1 +
>  drivers/mfd/max77843.c               |  245 +++++++++++++++++++
>  include/linux/mfd/max77843-private.h |  441 ++++++++++++++++++++++++++++++++++
>  4 files changed, 701 insertions(+)
>  create mode 100644 drivers/mfd/max77843.c
>  create mode 100644 include/linux/mfd/max77843-private.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2e6b731..0c67c79 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -442,6 +442,20 @@ config MFD_MAX77693
>  	  additional drivers must be enabled in order to use the functionality
>  	  of the device.
>  
> +config MFD_MAX77843
> +	bool "Maxim Semiconductor MAX77843 PMIC Support"
> +	depends on I2C=y
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	select REGMAP_IRQ
> +	help
> +	  Say yes here to add support for Maxim Semiconductor MAX77843.
> +	  This is companion Power Management IC with LEDs, Haptic, Charger,
> +	  Fuel Gauge, MUIC(Micro USB Interface Controller) controls on chip.
> +	  This driver provides common support for accessing the device;
> +	  additional drivers must be enabled in order to use the functionality
> +	  of the device.
> +
>  config MFD_MAX8907
>  	tristate "Maxim Semiconductor MAX8907 PMIC Support"
>  	select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 53467e2..fe4f75c 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -117,6 +117,7 @@ obj-$(CONFIG_MFD_DA9063)	+= da9063.o
>  obj-$(CONFIG_MFD_MAX14577)	+= max14577.o
>  obj-$(CONFIG_MFD_MAX77686)	+= max77686.o
>  obj-$(CONFIG_MFD_MAX77693)	+= max77693.o
> +obj-$(CONFIG_MFD_MAX77843)	+= max77843.o

This is the 11th MAX driver.  Can't they be supported using device
specific data structures instead of taking a 'one file per device'
approach?

>  obj-$(CONFIG_MFD_MAX8907)	+= max8907.o
>  max8925-objs			:= max8925-core.o max8925-i2c.o
>  obj-$(CONFIG_MFD_MAX8925)	+= max8925.o
> diff --git a/drivers/mfd/max77843.c b/drivers/mfd/max77843.c
> new file mode 100644
> index 0000000..191a557
> --- /dev/null
> +++ b/drivers/mfd/max77843.c
> @@ -0,0 +1,245 @@
> +/*
> + * max77843.c - MFD core driver for the Maxim MAX77843
> + *
> + * Copyright (C) 2015 Samsung Electronics
> + * Author: Jaewon Kim <jaewon02.kim@...sung.com>
> + * Author: Beomho Seo <beomho.seo@...sung.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/err.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/max77843-private.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>

[...]

> +static int max77843_probe(struct i2c_client *i2c,
> +					const struct i2c_device_id *id)

Strange tabbing here.

> +{
> +	struct max77843 *max77843;
> +	unsigned int reg_data;
> +	int ret;
> +
> +	max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
> +	if (!max77843)
> +		return -ENOMEM;
> +
> +	i2c_set_clientdata(i2c, max77843);
> +	max77843->dev = &i2c->dev;
> +	max77843->i2c = i2c;
> +	max77843->irq = i2c->irq;
> +
> +	max77843->regmap = devm_regmap_init_i2c(i2c,
> +			&max77843_regmap_config);
> +	if (IS_ERR(max77843->regmap)) {
> +		dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
> +		return PTR_ERR(max77843->regmap);
> +	}
> +
> +	ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
> +			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
> +			0, &max77843_irq_chip, &max77843->irq_data);
> +	if (ret) {
> +		dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
> +		return ret;
> +	}
> +
> +	ret = regmap_read(max77843->regmap,
> +			MAX77843_SYS_REG_PMICID, &reg_data);
> +	if (ret < 0) {
> +		dev_err(&i2c->dev, "Failed to read PMIC ID\n");
> +		goto err_pmic_id;
> +	}
> +	dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
> +
> +	ret = max77843_chg_init(max77843);
> +	if (ret) {
> +		dev_err(&i2c->dev, "Failed to init Charger\n");
> +		goto err_pmic_id;
> +	}
> +
> +	ret = regmap_update_bits(max77843->regmap,
> +			MAX77843_SYS_REG_INTSRCMASK,
> +			MAX77843_INTSRC_MASK_MASK,
> +			(unsigned int)~MAX77843_INTSRC_MASK_MASK);

This stuff looks so much better/easier to read if you line up against
the '('.

> +	if (ret < 0) {
> +		dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
> +		goto err_pmic_id;
> +	}
> +
> +	ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
> +			ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
> +	if (ret < 0) {
> +		dev_err(&i2c->dev, "Failed to add mfd device\n");
> +		goto err_pmic_id;
> +	}
> +
> +	device_init_wakeup(max77843->dev, 1);
> +
> +	return 0;
> +
> +err_pmic_id:
> +	regmap_del_irq_chip(max77843->irq, max77843->irq_data);
> +
> +	return ret;
> +}
> +
> +static int max77843_remove(struct i2c_client *i2c)
> +{
> +	struct max77843 *max77843 = i2c_get_clientdata(i2c);
> +
> +	mfd_remove_devices(max77843->dev);
> +
> +	regmap_del_irq_chip(max77843->irq, max77843->irq_data);
> +
> +	i2c_unregister_device(max77843->i2c_chg);
> +	i2c_unregister_device(max77843->i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id max77843_dt_match[] = {
> +	{ .compatible = "maxim,max77843", },
> +	{ /* sentinel */ },
> +};
> +
> +static const struct i2c_device_id max77843_id[] = {
> +	{ "max77843", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i2c, max77843_id);
> +
> +static int __maybe_unused max77843_suspend(struct device *dev)
> +{
> +	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
> +	struct max77843 *max77843 = i2c_get_clientdata(i2c);
> +
> +	if (device_may_wakeup(dev))
> +		enable_irq_wake(max77843->irq);
> +	disable_irq(max77843->irq);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused max77843_resume(struct device *dev)
> +{
> +	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
> +	struct max77843 *max77843 = i2c_get_clientdata(i2c);
> +
> +	if (device_may_wakeup(dev))
> +		disable_irq_wake(max77843->irq);
> +	enable_irq(max77843->irq);
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
> +
> +static struct i2c_driver max77843_i2c_driver = {
> +	.driver		= {

More strange whitespace stuff.

I'm gussing you haven't run checkpatch.pl.

Please do so and fix-up the warnings.
 
> +		.name		= "max77843",
> +		.pm		= &max77843_pm,
> +		.of_match_table = max77843_dt_match,
> +	},

Lining these up with the '=' doesn't make the code any better IMO.

[...]

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