linux-kernel - Re: [PATCH] GPIOLIB: add generic gpio_set_pull API

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Date:	Mon, 08 Aug 2011 18:45:16 -0700
From:	Rohit Vaswani <rvaswani@...eaurora.org>
To:	Kyungmin Park <kmpark@...radead.org>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Paul Mundt <lethal@...ux-sh.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, Barry Song <Baohua.Song@....com>
Subject: Re: [PATCH] GPIOLIB: add generic gpio_set_pull API

On 8/8/2011 3:57 PM, Kyungmin Park wrote:
> On Tue, Aug 9, 2011 at 3:24 AM, Grant Likely<grant.likely@...retlab.ca>  wrote:
>> On Mon, Aug 8, 2011 at 2:15 AM, Paul Mundt<lethal@...ux-sh.org>  wrote:
>>> On Sun, Aug 07, 2011 at 10:19:33PM -0700, Barry Song wrote:
>>>> Now there are many different implementations for GPIO pull configuration, for
>>>> example:
>>>> s3c_gpio_setpull()
>>>> tegra_pinmux_set_pullupdown()
>>>> chipcHw_setPinPullup()
>>>> gpio_pullup()
>>>> s3c2410_gpio_pullup()
>>>>
>>>> This patch adds a new generic gpio_set_pull API so that all SoCs can have unified
>>>> codes.
>>>>
>>>> Signed-off-by: Barry Song<Baohua.Song@....com>
>>> For arch/arm/mach-shmobile we also have gpio_pull_up() for board-g4evm.c
>>> and gpio_pull_down() for board-mackerel.c. Both of these would benefit
>>> from this sort of an API addition.
>> I think I'm okay with this API change.  Linus, what say you?  How does
>> this interact with your plans for pinctrl?
> If gpiolib accept the pullup control. gpiolib is better place to
> control gpio config.
> then remains are the gpio driver strength, and power down mode
> control. powerdown pull-up/down, powerdown in/out at samsung gpios.
If we add this API - the remaining gpio controls like drive strength and 
function select could also be added, which eats into the pinmux domain.
Linus W. had a patch earlier which added an API for a gpio config to be 
specified through gpiolib. " gpio: add a custom configuration mechanism 
to gpiolib" which is sort of an extensible model of this API.

Thanks,
Rohit
>
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Thanks,
Rohit Vaswani

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