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AXP209 GPIO & pinctrl controller
This driver follows the usual GPIO bindings found in
Documentation/devicetree/bindings/gpio/gpio.txt
This driver follows the usual pinctrl bindings found in
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
This driver employs the per-pin muxing pattern.
Required properties:
- compatible: Should be one of:
- "x-powers,axp209-gpio"
- "x-powers,axp813-gpio"
- #gpio-cells: Should be two. The first cell is the pin number and the
second is the GPIO flags.
- gpio-controller: Marks the device node as a GPIO controller.
This node must be a subnode of the axp20x PMIC, documented in
Documentation/devicetree/bindings/mfd/axp20x.txt
Example:
axp209: pmic@34 {
compatible = "x-powers,axp209";
reg = <0x34>;
interrupt-parent = <&nmi_intc>;
interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
interrupt-controller;
#interrupt-cells = <1>;
axp_gpio: gpio {
compatible = "x-powers,axp209-gpio";
gpio-controller;
#gpio-cells = <2>;
};
};
The GPIOs can be muxed to other functions and therefore, must be a subnode of
axp_gpio.
Example:
&axp_gpio {
gpio0_adc: gpio0-adc {
pins = "GPIO0";
function = "adc";
};
};
&example_node {
pinctrl-names = "default";
pinctrl-0 = <&gpio0_adc>;
};
GPIOs and their functions
-------------------------
Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does
not force GPIO1 and GPIO2 to be in gpio_in function as well).
axp209
------
GPIO | Functions
------------------------
GPIO0 | gpio_in, gpio_out, ldo, adc
GPIO1 | gpio_in, gpio_out, ldo, adc
GPIO2 | gpio_in, gpio_out
axp813
------
GPIO | Functions
------------------------
GPIO0 | gpio_in, gpio_out, ldo, adc
GPIO1 | gpio_in, gpio_out, ldo
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