On Tue, Jul 15, 2014 at 04:36:20PM +0900, Alexandre Courbot wrote: > Direction and initial value, on the other hand, are clearly properties > that ought to be set by the driver itself. Thus my expectation here > would be that the driver sets the GPIO direction and initial value as > soon as it gets it using gpiod_direction_output(). In other words,
Well, it's a bit of a mix really - from a hardware point of view they normally are actually often fixed. > there is no replacement for gpio_request_one() with the gpiod > interface. Is there any use-case that cannot be covered by calling > gpiod_direction_output() right after gpiod_get()? AFAICT this is what > gpio_request_one() was doing anyway. Right, the original goal was to provide a better interface for requesting a GPIO - it saves a lot of error handling code throughout the kernel and avoids the possibility of bugs due to users forgetting to mark the directio for the GPIO. Having a direct replacement also makes conversions to gpiod easier.
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