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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>;
};
};
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