configuration for nc pins without pull

[Uwe Kleine-König]

On Sun, Mar 22, 2015 at 11:00:59AM +0100, Uwe Kleine-König wrote:
> Hello,
> 
> for a machine I want to configure a pin that is actually not connected
> to minimize floating. (I think this is sensible, isn't it?)
> 
> For the pinctrl I can use a hog group of the pinctrl device. At least
> one of the pins doesn't have a pullup/pulldown configuration though, so
> I want to mux it to its gpio function and set the gpio to output and the
> desired value.
> 
> Is there something nicer than defining an always-on regulator with gpios
> = <&gpio4 3 0> to accomplish that without additional code?
For the archive: Yes, there is something nicer in the meantime:

Since commit f625d4601759 (gpio: add GPIO hogging mechanism) which is
included in v4.1-rc1 you can do something like

&gpio3 {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_gpio3hog>;

        ext-armclk {
                gpio-hog;
                gpios = <15 0>;
                output-low;
        };
};

in the devicetree (here for an i.MX25).

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |