linux-kernel - Re: [PATCH 1/3] mfd: MAX6650/6651 support

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Date:	Wed, 8 Jan 2014 14:39:28 +0000
From:	Laszlo Papp <lpapp@....org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Mark Brown <broonie@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mfd: MAX6650/6651 support

On Tue, Jan 7, 2014 at 2:11 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Mon, Dec 23, 2013 at 5:08 PM, Laszlo Papp <lpapp@....org> wrote:
>
>> 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>
> (...)
>> +++ b/include/linux/mfd/max6651-private.h
>> +struct max6651_dev {
>> +    struct device *dev;
>> +    struct mutex iolock;
>> +
>> +    struct i2c_client *i2c;
>> +
>> +       int type;
>> +};
>> +
>> +enum max6651_types {
>> +       TYPE_MAX6650,
>> +       TYPE_MAX6651,
>> +};
>> +
>> +extern int max6651_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
>> +extern int max6651_write_reg(struct i2c_client *i2c, u8 reg, u8 value);
>
> It looks like you're reinventing regmap.
>
> - In the Kconfig entry for the MFD device:
>   select REGMAP_I2C
>
> - Look in drivers/mfd/stw481x.c for an example using
>   <linux/regmap.h>
>
> - Look into
>   drivers/regulator/stw481x-vmmc.c
>   for an example regmap MFD spawned child cell.

Oh, thanks, Linus!

I will have a look.
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