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>; }; };