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1NXP LPC18xx/43xx GPIO controller Device Tree Bindings2-----------------------------------------------------3 4Required properties:5- compatible : Should be "nxp,lpc1850-gpio"6- reg : List of addresses and lengths of the GPIO controller7 register sets8- reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and9 "gpio-gpoup1-ic"10- clocks : Phandle and clock specifier pair for GPIO controller11- resets : Phandle and reset specifier pair for GPIO controller12- gpio-controller : Marks the device node as a GPIO controller13- #gpio-cells : Should be two:14 - The first cell is the GPIO line number15 - The second cell is used to specify polarity16- interrupt-controller : Marks the device node as an interrupt controller17- #interrupt-cells : Should be two:18 - The first cell is an interrupt number within19 0..9 range, for GPIO pin interrupts it is equal20 to 'nxp,gpio-pin-interrupt' property value of21 GPIO pin configuration, 8 is for GPIO GROUP022 interrupt, 9 is for GPIO GROUP1 interrupt23 - The second cell is used to specify interrupt type24 25Optional properties:26- gpio-ranges : Mapping between GPIO and pinctrl27 28Example:29#define LPC_GPIO(port, pin) (port * 32 + pin)30#define LPC_PIN(port, pin) (0x##port * 32 + pin)31 32gpio: gpio@400f4000 {33 compatible = "nxp,lpc1850-gpio";34 reg = <0x400f4000 0x4000>, <0x40087000 0x1000>,35 <0x40088000 0x1000>, <0x40089000 0x1000>;36 reg-names = "gpio", "gpio-pin-ic",37 "gpio-group0-ic", "gpio-gpoup1-ic";38 clocks = <&ccu1 CLK_CPU_GPIO>;39 resets = <&rgu 28>;40 gpio-controller;41 #gpio-cells = <2>;42 interrupt-controller;43 #interrupt-cells = <2>;44 gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>,45 ...46 <&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>;47};48 49gpio_joystick {50 compatible = "gpio-keys";51 ...52 53 button0 {54 ...55 interrupt-parent = <&gpio>;56 interrupts = <1 IRQ_TYPE_EDGE_BOTH>;57 gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;58 };59};60