On Sonntag, 14. Mai 2017 23:00:38 CEST Martin Blumenstingl wrote:
> > / {
> >
> > model = "UBNT-ERX-SFP";
> >
> > i2c-gpio {
> >
> > compatible = "i2c-gpio";
> > gpios = <&gpio0 3 GPIO_ACTIVE_HIGH /* sda */
> >
> > &gpio0 4 GPIO_ACTIVE_HIGH /* scl */
> >
> > >;
> >
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > gpio_pca: pca9555@25 {
> >
> > compatible = "pca9555";
> > reg = <0x25>;
>
> you seem to be missing two properties here which indicate that this is
> actually a GPIO controller:
> #gpio-cells = <2>;
> gpio-controller;
>
> value 2 in #gpio-cells means that whenever you reference a GPIO (just
> like you do in your poe_passthrough node) that the first parameter is
> the pin number and the second parameter is the polarity (active
> high/low)
> gpio-controller should be self-explanatory
>
Martin, having dts like:
gpio_pca: pca9555@25 {
compatible = "pca9555";
#gpio-cells = <2>;
gpio-controller;
reg = <0x25>;
};
end up in a similar thing as before
[ 1.650000] ------------[ cut here ]------------
[ 1.660000] WARNING: CPU: 0 PID: 1 at drivers/gpio/gpiolib.c:85 0x801dc2fc()
[ 1.680000] invalid GPIO -517
[ 1.680000] Modules linked in:
[ 1.690000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.61 #0
Not sure if this is better then the
"/gpio_export/poe_passthrough: could not get #gpio-cells for
/i2c-gpio/pca9555@25" fault.
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