nxp,lpc1850-gpio.txt

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    1 NXP LPC18xx/43xx GPIO controller Device Tree Bindings
    2 -----------------------------------------------------
    3 
    4 Required 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 
   25 Optional properties:
   26 - gpio-ranges           : Mapping between GPIO and pinctrl
   27 
   28 Example:
   29 #define LPC_GPIO(port, pin)     (port * 32 + pin)
   30 #define LPC_PIN(port, pin)      (0x##port * 32 + pin)
   31 
   32 gpio: 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 
   49 gpio_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 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/gpio/nxp,lpc1850-gpio.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/gpio/nxp,lpc1850-gpio.txt