NXP LPC18xx/43xx GPIO controller Device Tree Bindings
|
-----------------------------------------------------
|
|
Required properties:
|
- compatible : Should be "nxp,lpc1850-gpio"
|
- reg : List of addresses and lengths of the GPIO controller
|
register sets
|
- reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and
|
"gpio-gpoup1-ic"
|
- clocks : Phandle and clock specifier pair for GPIO controller
|
- resets : Phandle and reset specifier pair for GPIO controller
|
- gpio-controller : Marks the device node as a GPIO controller
|
- #gpio-cells : Should be two:
|
- The first cell is the GPIO line number
|
- The second cell is used to specify polarity
|
- interrupt-controller : Marks the device node as an interrupt controller
|
- #interrupt-cells : Should be two:
|
- The first cell is an interrupt number within
|
0..9 range, for GPIO pin interrupts it is equal
|
to 'nxp,gpio-pin-interrupt' property value of
|
GPIO pin configuration, 8 is for GPIO GROUP0
|
interrupt, 9 is for GPIO GROUP1 interrupt
|
- The second cell is used to specify interrupt type
|
|
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>, <0x40087000 0x1000>,
|
<0x40088000 0x1000>, <0x40089000 0x1000>;
|
reg-names = "gpio", "gpio-pin-ic",
|
"gpio-group0-ic", "gpio-gpoup1-ic";
|
clocks = <&ccu1 CLK_CPU_GPIO>;
|
resets = <&rgu 28>;
|
gpio-controller;
|
#gpio-cells = <2>;
|
interrupt-controller;
|
#interrupt-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";
|
...
|
|
button0 {
|
...
|
interrupt-parent = <&gpio>;
|
interrupts = <1 IRQ_TYPE_EDGE_BOTH>;
|
gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
|
};
|
};
|
