Re: [PATCH] ARM: dts: imx28: add gpio-ranges for internal gpio controller

[Shawn Guo <shawnguo@xxxxxxxxxx>]

On Fri, May 12, 2017 at 10:01:50AM +0200, Uwe Kleine-König wrote:
> On Fri, May 12, 2017 at 11:05:38AM +0800, Shawn Guo wrote:
> > I went through the code around requesting a pin, and found that we need
> > to call pinctrl_request_gpio() from gpio driver to get the result you
> > want.  In that case, pin_request() will be called with a valid
> > gpio_range as below.
> > 
> >     pinctrl_request_gpio()
> >         pinmux_request_gpio()
> >             pin_request(..., gpio_range)
> > 
> > Right now, pin_request() is being called with a NULL gpio_range from
> > pinmux_enable_setting().  That gets us the mux_owner rather than
> > gpio_owner for the pin.
> 
> But then again I cannot mux a pin to a different function when the gpio
> is requested, right?

You will need to free the GPIO before muxing it to a different function,
I think.

Shawn
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