summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/gpio/gpio-axp209.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-axp209.txt')
-rw-r--r--Documentation/devicetree/bindings/gpio/gpio-axp209.txt75
1 files changed, 75 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-axp209.txt b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt
new file mode 100644
index 000000000..fc42b2caa
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt
@@ -0,0 +1,75 @@
+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