40 lines
1 KiB
Plaintext
40 lines
1 KiB
Plaintext
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NXP LPC18xx/43xx GPIO controller Device Tree Bindings
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-----------------------------------------------------
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Required properties:
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- compatible : Should be "nxp,lpc1850-gpio"
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- reg : Address and length of the register set for the device
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- clocks : Clock specifier (see clock bindings for details)
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- gpio-controller : Marks the device node as a GPIO controller.
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- #gpio-cells : Should be two
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- First cell is the GPIO line number
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- Second cell is used to specify polarity
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Optional properties:
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- gpio-ranges : Mapping between GPIO and pinctrl
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Example:
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#define LPC_GPIO(port, pin) (port * 32 + pin)
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#define LPC_PIN(port, pin) (0x##port * 32 + pin)
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gpio: gpio@400f4000 {
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compatible = "nxp,lpc1850-gpio";
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reg = <0x400f4000 0x4000>;
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clocks = <&ccu1 CLK_CPU_GPIO>;
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gpio-controller;
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#gpio-cells = <2>;
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gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>,
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...
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<&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>;
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};
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gpio_joystick {
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compatible = "gpio-keys-polled";
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...
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button@0 {
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...
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gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
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};
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};
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