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

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Date:	Wed, 15 Jan 2014 09:02:11 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>, Mark Brown <broonie@...nel.org>
Cc:	Laszlo Papp <lpapp@....org>, Guenter Roeck <linux@...ck-us.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mfd: MAX6650/6651 support

On Fri, Jan 10, 2014 at 10:56 AM, Lee Jones <lee.jones@...aro.org> wrote:
> On Thu, 09 Jan 2014, Laszlo Papp wrote:
>
>> >> +int max6651_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
>> >> +{
>> >
>> > Probably best to use Regmap instead.
>> >
>> > regmap_i2c_read()
>>
>> >> +int max6651_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
>> >> +{
>> >> +    struct max6651_dev *max6651 = i2c_get_clientdata(i2c);
>> >> +    int ret;
>> >
>> > Same here.
>> >
>> > regmap_i2c_write()
>>
>> Hmm, but what Linus linked is using regmap_read/write(...) instead of
>> regmap_i2c_read/write(...).
>>
>> I thought I would need to be using the former. Perhaps, I
>> misunderstand something?
>>
>> I do not even find the aforementioend functions used by drivers based
>> on this LXR result:
>> http://lxr.free-electrons.com/ident?i=regmap_i2c_write
>
> Linus is in a better position to know, use his suggestion.

Just use regmap_read/write to abstract things and hide the
underlying marshalling in regmap.

regmap_i2c_write is some regmap-internal thing.

Yours,
Linus Walleij
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