Re: [PATCH v2 2/2] gpio: pxa: add pin control gpio direction and request
From: Linus Walleij
Date: Tue Dec 15 2015 - 08:17:46 EST
On Sat, Dec 12, 2015 at 11:55 PM, Robert Jarzmik <robert.jarzmik@xxxxxxx> wrote:
> If a pin control driver is available, use it to change the gpio
> direction. If not fallback to directly manipulating the gpio direction
> The reason to use the pin control driver first is that pin control in
> pxa2xx architecture implies changing the gpio direction, even for non
> gpio functions. In order to do it atomically, only one driver should
> control the gpio direction, and if a pin controller is available, it has
> to be him.
> There is a small catch : if CONFIG_PINCTRL is selected, then a pinctrl
> driver has to be probed. If not, gpio_request() will return
> -EPROBE_DEFER as pinctrl_request_gpio() returns it in that case.
> Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
> Since v1: expand commit message to state the gpio possible breakage if
> CONFIG_PINCTRL is selected and no pinctrl driver is built.
Now you only need to send the incremental diff for patch 1/2.
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