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@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
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