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NXP LPC18xx/43xx GPIO controller Device Tree Bindings
-----------------------------------------------------
Required properties:
- compatible : Should be "nxp,lpc1850-gpio"
- reg : Address and length of the register set for the device
- clocks : Clock specifier (see clock bindings for details)
- gpio-controller : Marks the device node as a GPIO controller.
- #gpio-cells : Should be two
- First cell is the GPIO line number
- Second cell is used to specify polarity
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>;
clocks = <&ccu1 CLK_CPU_GPIO>;
gpio-controller;
#gpio-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-polled";
...
button@0 {
...
gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
};
};
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