nxp,lpc1850-gpio.txt (1954B)
1NXP LPC18xx/43xx GPIO controller Device Tree Bindings 2----------------------------------------------------- 3 4Required properties: 5- compatible : Should be "nxp,lpc1850-gpio" 6- reg : List of addresses and lengths of the GPIO controller 7 register sets 8- reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and 9 "gpio-gpoup1-ic" 10- clocks : Phandle and clock specifier pair for GPIO controller 11- resets : Phandle and reset specifier pair for GPIO controller 12- gpio-controller : Marks the device node as a GPIO controller 13- #gpio-cells : Should be two: 14 - The first cell is the GPIO line number 15 - The second cell is used to specify polarity 16- interrupt-controller : Marks the device node as an interrupt controller 17- #interrupt-cells : Should be two: 18 - The first cell is an interrupt number within 19 0..9 range, for GPIO pin interrupts it is equal 20 to 'nxp,gpio-pin-interrupt' property value of 21 GPIO pin configuration, 8 is for GPIO GROUP0 22 interrupt, 9 is for GPIO GROUP1 interrupt 23 - The second cell is used to specify interrupt type 24 25Optional properties: 26- gpio-ranges : Mapping between GPIO and pinctrl 27 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};