65 lines
1.5 KiB
Plaintext
65 lines
1.5 KiB
Plaintext
AXP209 GPIO & pinctrl controller
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This driver follows the usual GPIO bindings found in
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Documentation/devicetree/bindings/gpio/gpio.txt
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This driver follows the usual pinctrl bindings found in
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Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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This driver employs the per-pin muxing pattern.
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Required properties:
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- compatible: Should be "x-powers,axp209-gpio"
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- #gpio-cells: Should be two. The first cell is the pin number and the
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second is the GPIO flags.
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- gpio-controller: Marks the device node as a GPIO controller.
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This node must be a subnode of the axp20x PMIC, documented in
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Documentation/devicetree/bindings/mfd/axp20x.txt
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Example:
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axp209: pmic@34 {
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compatible = "x-powers,axp209";
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reg = <0x34>;
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interrupt-parent = <&nmi_intc>;
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interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
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interrupt-controller;
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#interrupt-cells = <1>;
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axp_gpio: gpio {
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compatible = "x-powers,axp209-gpio";
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gpio-controller;
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#gpio-cells = <2>;
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};
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};
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The GPIOs can be muxed to other functions and therefore, must be a subnode of
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axp_gpio.
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Example:
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&axp_gpio {
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gpio0_adc: gpio0-adc {
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pins = "GPIO0";
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function = "adc";
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};
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};
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&example_node {
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pinctrl-names = "default";
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pinctrl-0 = <&gpio0_adc>;
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};
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GPIOs and their functions
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-------------------------
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Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does
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not force GPIO1 and GPIO2 to be in gpio_in function as well).
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GPIO | Functions
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------------------------
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GPIO0 | gpio_in, gpio_out, ldo, adc
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GPIO1 | gpio_in, gpio_out, ldo, adc
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GPIO2 | gpio_in, gpio_out
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