linux-kernel - Re: [PATCH V2 2/3] gpio: gpiolib: Support for open drain/collector gpios

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Message-ID: <20120217163659.GD10146@opensource.wolfsonmicro.com>
Date:	Fri, 17 Feb 2012 08:37:01 -0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	grant.likely@...retlab.ca, linus.walleij@...ricsson.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH V2 2/3] gpio: gpiolib: Support for open drain/collector
 gpios

On Fri, Feb 17, 2012 at 08:26:21PM +0530, Laxman Dewangan wrote:
> Adding support for the open drain gpio on which client
> can specify the open drain property through GPIO flag
> GPIOF_OPEN_DRAIN at the time of gpio request.
> The open drain pins are normally pulled high and it
> cannot be driven to output with value of 1 and so
> when client request for setting the pin to HIGH, the
> gpio will be set to input direction to make pin in tristate
> and hence PULL-UP on pins will make the state to HIGH.
> The open drain pin can be driven to LOW by setting output
> with value of 0.

Reviwed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

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