gpio: add DT bindings for lpc1850-gpio driver
Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/Documentation/devicetree/bindings/gpio/nxp,lpc1850-gpio.txt b/Documentation/devicetree/bindings/gpio/nxp,lpc1850-gpio.txt
new file mode 100644
index 0000000..eb7cdd6
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/nxp,lpc1850-gpio.txt
@@ -0,0 +1,39 @@
+NXP LPC18xx/43xx GPIO controller Device Tree Bindings
+-----------------------------------------------------
+
+Required properties:
+- compatible : Should be "nxp,lpc1850-gpio"
+- reg : Address and length of the register set for the device
+- clocks : Clock specifier (see clock bindings for details)
+- gpio-controller : Marks the device node as a GPIO controller.
+- #gpio-cells : Should be two
+ - First cell is the GPIO line number
+ - Second cell is used to specify polarity
+
+Optional properties:
+- gpio-ranges : Mapping between GPIO and pinctrl
+
+Example:
+#define LPC_GPIO(port, pin) (port * 32 + pin)
+#define LPC_PIN(port, pin) (0x##port * 32 + pin)
+
+gpio: gpio@400f4000 {
+ compatible = "nxp,lpc1850-gpio";
+ reg = <0x400f4000 0x4000>;
+ clocks = <&ccu1 CLK_CPU_GPIO>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>,
+ ...
+ <&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>;
+};
+
+gpio_joystick {
+ compatible = "gpio-keys-polled";
+ ...
+
+ button@0 {
+ ...
+ gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
+ };
+};