On Fri, May 18, 2018 at 11:52:05AM +0800, djw at t-chip.com.cn wrote: > From: Levin Du <djw at t-chip.com.cn> > > Some GPIOs sit in the GRF_SOC_CON registers of Rockchip SoCs, > which do not belong to the general pinctrl. > > Adding gpio-syscon support makes controlling regulator or > LED using these special pins very easy by reusing existing > drivers, such as gpio-regulator and led-gpio. > > Signed-off-by: Levin Du <djw at t-chip.com.cn> > > --- > > Changes in v2: > - Rename gpio_syscon10 to gpio_mute in doc > > Changes in v1: > - Refactured for general gpio-syscon usage for Rockchip SoCs. > - Add doc rockchip,gpio-syscon.txt > > .../bindings/gpio/rockchip,gpio-syscon.txt | 41 ++++++++++++++++++++++ > drivers/gpio/gpio-syscon.c | 30 ++++++++++++++++ > 2 files changed, 71 insertions(+) > create mode 100644 Documentation/devicetree/bindings/gpio/rockchip,gpio-syscon.txt > > diff --git a/Documentation/devicetree/bindings/gpio/rockchip,gpio-syscon.txt b/Documentation/devicetree/bindings/gpio/rockchip,gpio-syscon.txt > new file mode 100644 > index 0000000..b1b2a67 > --- /dev/null > +++ b/Documentation/devicetree/bindings/gpio/rockchip,gpio-syscon.txt > @@ -0,0 +1,41 @@ > +* Rockchip GPIO support for GRF_SOC_CON registers > + > +Required properties: > +- compatible: Should contain "rockchip,gpio-syscon". > +- gpio-controller: Marks the device node as a gpio controller. > +- #gpio-cells: Should be two. The first cell is the pin number and > + the second cell is used to specify the gpio polarity: > + 0 = Active high, > + 1 = Active low. There's no need for this child node. Just make the parent node a gpio controller. Rob
