Documentation: bindings: add DT documentation for Rockchip USB2PHY

Change-Id: I67f4612e95279fabe30aa63f803cd83921b04bd7
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
new file mode 100644 (file)
index 0000000..4e537b2
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+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
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+ROCKCHIP USB2.0 PHY WITH INNO IP BLOCK
+
+Required properties (phy (parent) node):
+ - compatible: should contain:
+       * "rockchip,rk3366-usb2phy"
+ - #clock-cells: should be 0.
+ - clock-names: specify the 480m output clk name.
+
+Optional properties:
+ - vbus_host-gpio: pull gpio high/low to control the host vbus power.
+
+Required nodes: a sub-node is required for each port the phy provides.
+               The sub-node name is used to identify host or otg port.
+
+Required properties (port (child) node):
+ - #phy-cells: must be 0. See ./phy-bindings.txt for details.
+ - interrupts: irq number for host/otg port.
+ - interrupt-names: interrupt name, in line with irq number.
+
+Example:
+
+grf: syscon@ff770000 {
+       compatible = "rockchip,rk3366-grf", "syscon", "simple-mfd";
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+...
+
+       u2phy: usb2-phy {
+               compatible = "rockchip,rk3366-usb2phy";
+               #clock-cells = <0>;
+               clock-output-names = "sclk_otgphy0_480m";
+
+               u2phy_otg: otg-port {
+                       #phy-cells = <0>;
+                       interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
+                       interrupt-names = "linestate";
+                       status = "okay";
+               };
+
+               u2phy_host: host-port {
+                       #phy-cells = <0>;
+                       interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>;
+                       interrupt-names = "linestate";
+                       status = "okay";
+               };
+       };
+};