1*c66ec88fSEmmanuel VadotNXP LPC18xx/43xx GPIO controller Device Tree Bindings 2*c66ec88fSEmmanuel Vadot----------------------------------------------------- 3*c66ec88fSEmmanuel Vadot 4*c66ec88fSEmmanuel VadotRequired properties: 5*c66ec88fSEmmanuel Vadot- compatible : Should be "nxp,lpc1850-gpio" 6*c66ec88fSEmmanuel Vadot- reg : List of addresses and lengths of the GPIO controller 7*c66ec88fSEmmanuel Vadot register sets 8*c66ec88fSEmmanuel Vadot- reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and 9*c66ec88fSEmmanuel Vadot "gpio-gpoup1-ic" 10*c66ec88fSEmmanuel Vadot- clocks : Phandle and clock specifier pair for GPIO controller 11*c66ec88fSEmmanuel Vadot- resets : Phandle and reset specifier pair for GPIO controller 12*c66ec88fSEmmanuel Vadot- gpio-controller : Marks the device node as a GPIO controller 13*c66ec88fSEmmanuel Vadot- #gpio-cells : Should be two: 14*c66ec88fSEmmanuel Vadot - The first cell is the GPIO line number 15*c66ec88fSEmmanuel Vadot - The second cell is used to specify polarity 16*c66ec88fSEmmanuel Vadot- interrupt-controller : Marks the device node as an interrupt controller 17*c66ec88fSEmmanuel Vadot- #interrupt-cells : Should be two: 18*c66ec88fSEmmanuel Vadot - The first cell is an interrupt number within 19*c66ec88fSEmmanuel Vadot 0..9 range, for GPIO pin interrupts it is equal 20*c66ec88fSEmmanuel Vadot to 'nxp,gpio-pin-interrupt' property value of 21*c66ec88fSEmmanuel Vadot GPIO pin configuration, 8 is for GPIO GROUP0 22*c66ec88fSEmmanuel Vadot interrupt, 9 is for GPIO GROUP1 interrupt 23*c66ec88fSEmmanuel Vadot - The second cell is used to specify interrupt type 24*c66ec88fSEmmanuel Vadot 25*c66ec88fSEmmanuel VadotOptional properties: 26*c66ec88fSEmmanuel Vadot- gpio-ranges : Mapping between GPIO and pinctrl 27*c66ec88fSEmmanuel Vadot 28*c66ec88fSEmmanuel VadotExample: 29*c66ec88fSEmmanuel Vadot#define LPC_GPIO(port, pin) (port * 32 + pin) 30*c66ec88fSEmmanuel Vadot#define LPC_PIN(port, pin) (0x##port * 32 + pin) 31*c66ec88fSEmmanuel Vadot 32*c66ec88fSEmmanuel Vadotgpio: gpio@400f4000 { 33*c66ec88fSEmmanuel Vadot compatible = "nxp,lpc1850-gpio"; 34*c66ec88fSEmmanuel Vadot reg = <0x400f4000 0x4000>, <0x40087000 0x1000>, 35*c66ec88fSEmmanuel Vadot <0x40088000 0x1000>, <0x40089000 0x1000>; 36*c66ec88fSEmmanuel Vadot reg-names = "gpio", "gpio-pin-ic", 37*c66ec88fSEmmanuel Vadot "gpio-group0-ic", "gpio-gpoup1-ic"; 38*c66ec88fSEmmanuel Vadot clocks = <&ccu1 CLK_CPU_GPIO>; 39*c66ec88fSEmmanuel Vadot resets = <&rgu 28>; 40*c66ec88fSEmmanuel Vadot gpio-controller; 41*c66ec88fSEmmanuel Vadot #gpio-cells = <2>; 42*c66ec88fSEmmanuel Vadot interrupt-controller; 43*c66ec88fSEmmanuel Vadot #interrupt-cells = <2>; 44*c66ec88fSEmmanuel Vadot gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>, 45*c66ec88fSEmmanuel Vadot ... 46*c66ec88fSEmmanuel Vadot <&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>; 47*c66ec88fSEmmanuel Vadot}; 48*c66ec88fSEmmanuel Vadot 49*c66ec88fSEmmanuel Vadotgpio_joystick { 50*c66ec88fSEmmanuel Vadot compatible = "gpio-keys"; 51*c66ec88fSEmmanuel Vadot ... 52*c66ec88fSEmmanuel Vadot 53*c66ec88fSEmmanuel Vadot button0 { 54*c66ec88fSEmmanuel Vadot ... 55*c66ec88fSEmmanuel Vadot interrupt-parent = <&gpio>; 56*c66ec88fSEmmanuel Vadot interrupts = <1 IRQ_TYPE_EDGE_BOTH>; 57*c66ec88fSEmmanuel Vadot gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>; 58*c66ec88fSEmmanuel Vadot }; 59*c66ec88fSEmmanuel Vadot}; 60