gpio: Document ZTE zx296702 GPIO DT binding

Add document of ZTE zx296702 GPIO binding

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/gpio/zx296702-gpio.txt b/Documentation/devicetree/bindings/gpio/zx296702-gpio.txt
new file mode 100644 (file)
index 0000000..0dab156
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/zx296702-gpio.txt
@@ -0,0 +1,24 @@
+ZTE ZX296702 GPIO controller
+
+Required properties:
+- compatible : "zte,zx296702-gpio"
+- #gpio-cells : Should be two. The first cell is the pin number and the
+  second cell is used to specify optional parameters:
+  - bit 0 specifies polarity (0 for normal, 1 for inverted)
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupts : Interrupt mapping for GPIO IRQ.
+- gpio-ranges : Interaction with the PINCTRL subsystem.
+
+gpio1: gpio@b008040 {
+       compatible = "zte,zx296702-gpio";
+       reg = <0xb008040 0x40>;
+       gpio-controller;
+       #gpio-cells = <2>;
+       gpio-ranges = < &pmx0 0 54 2 &pmx0 2 59 14>;
+       interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+       interrupt-parent = <&intc>;
+       interrupt-controller;
+       #interrupt-cells = <2>;
+       clock-names = "gpio_pclk";
+       clocks = <&lsp0clk ZX296702_GPIO_CLK>;
+};