linux-kernel - Re: [PATCH v3] mfd: MAX6650/6651 support

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Date:	Mon, 10 Feb 2014 11:22:42 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Laszlo Papp <lpapp@....org>
Cc:	linus.walleij@...aro.org, k.kozlowski@...sung.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mfd: MAX6650/6651 support

> MAX6650/MAX6651 chip is a multi-function device with I2C busses. The
> chip includes fan-speed regulators and monitors, GPIO, and alarm.
> 
> This patch is an initial release of a MAX6650/6651 MFD driver that
> supports to enable the chip with its primary I2C bus that will connect
> the hwmon, and then the gpio devices for now.
> 
> Signed-off-by: Laszlo Papp <lpapp@....org>
> ---
>  drivers/mfd/Kconfig                 | 11 +++++
>  drivers/mfd/Makefile                |  1 +
>  drivers/mfd/max665x.c               | 88 +++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/max665x-private.h | 42 ++++++++++++++++++
>  4 files changed, 142 insertions(+)
>  create mode 100644 drivers/mfd/max665x.c
>  create mode 100644 include/linux/mfd/max665x-private.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 49bb445..4ad39f4 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -368,6 +368,17 @@ config MFD_MAX8907
>  	  accessing the device; additional drivers must be enabled in order
>  	  to use the functionality of the device.
>  
> +config MFD_MAX665X
> +	bool "Maxim Semiconductor MAX6650/MAX6651 Support"
> +	select MFD_CORE
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	  Say yes here to support for Maxim Semiconductor MAX6650/MAX6651. This is
> +	  a fan speed regulator and monitor IC. 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_MAX8925
>  	bool "Maxim Semiconductor MAX8925 PMIC Support"
>  	depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 5aea5ef..63668c5 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -111,6 +111,7 @@ obj-$(CONFIG_MFD_DA9055)	+= da9055.o
>  da9063-objs			:= da9063-core.o da9063-irq.o da9063-i2c.o
>  obj-$(CONFIG_MFD_DA9063)	+= da9063.o
>  
> +obj-$(CONFIG_MFD_MAX665X)	+= max665x.o
>  obj-$(CONFIG_MFD_MAX14577)	+= max14577.o
>  obj-$(CONFIG_MFD_MAX77686)	+= max77686.o max77686-irq.o
>  obj-$(CONFIG_MFD_MAX77693)	+= max77693.o max77693-irq.o
> diff --git a/drivers/mfd/max665x.c b/drivers/mfd/max665x.c
> new file mode 100644
> index 0000000..cd39b5a
> --- /dev/null
> +++ b/drivers/mfd/max665x.c
> @@ -0,0 +1,88 @@
> +/*
> + * Device access for MAX6650-MAX6651
> + *
> + * Copyright(c) 2013 Polatis Ltd.
> + *
> + * Author: Laszlo Papp <laszlo.papp@...atis.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/device.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +
> +#include <linux/mfd/max665x-private.h>
> +
> +static struct mfd_cell max665x_devs[] = {
> +	{ .name = "max6651-gpio", },
> +	{ .name = "max6650", }, /* hwmon driver */

What happened to renaming the hwmon driver, so we can have
"max6650-hwmon" here?

<snip>

> +static const struct i2c_device_id max665x_id[] = {
> +	{ "max6650", TYPE_MAX6650 },
> +	{ "max6651", TYPE_MAX6651 },
> +	{},

Can you remind me where these IDs are being used?

> +};
> +MODULE_DEVICE_TABLE(i2c, max665x_id);
> +
> +static struct i2c_driver max665x_driver = {
> +	.driver = {
> +		.name = "max665x",
> +		.owner = THIS_MODULE,

All new drivers are required to support Device Tree.

<snip>

> +#ifndef __LINUX_MFD_MAX665X_PRIVATE_H
> +#define __LINUX_MFD_MAX665X_PRIVATE_H
> +
> +#include <linux/i2c.h>
> +#include <linux/export.h>

What's this here for?

> +#include <linux/regmap.h>
> +
> +struct max665x_dev {
> +	struct device *dev;
> +	struct mutex iolock;
> +
> +	struct i2c_client *i2c;
> +	struct regmap     *map;
> +
> +	int type;
> +};
> +
> +enum max665x_types {
> +	TYPE_MAX6650,
> +	TYPE_MAX6651,
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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