ARM: dts: Add binding documentation for AXP20x pmic usb power supply

Add binding documentation for the usb power supply part of the AXP20x pmic.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

diff --git a/Documentation/devicetree/bindings/power_supply/axp20x_usb_power.txt b/Documentation/devicetree/bindings/power_supply/axp20x_usb_power.txt
new file mode 100644 (file)
index 0000000..862f4a4
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/axp20x_usb_power.txt
@@ -0,0 +1,34 @@
+AXP20x USB power supply
+
+Required Properties:
+-compatible: "x-powers,axp202-usb-power-supply"
+
+This node is a subnode of the axp20x PMIC.
+
+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>;
+
+       regulators {
+               x-powers,dcdc-freq = <1500>;
+
+               vdd_cpu: dcdc2 {
+                       regulator-always-on;
+                       regulator-min-microvolt = <1000000>;
+                       regulator-max-microvolt = <1450000>;
+                       regulator-name = "vdd-cpu";
+               };
+
+               ...
+       };
+
+       usb-power-supply: usb-power-supply {
+               compatible = "x-powers,axp202-usb-power-supply";
+       };
+};