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    SubjectRe: [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 <>
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