dt-bindings: add binding for Rockchip hdmi phy using an Innosilicon IP

The phy is used so far in two Rockchip socs the rk3228 and the rk3328.

Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-hdmi.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-hdmi.txt
new file mode 100644 (file)
index 0000000..710cccd
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-hdmi.txt
@@ -0,0 +1,43 @@
+ROCKCHIP HDMI PHY WITH INNO IP BLOCK
+
+Required properties:
+ - compatible : should be one of the listed compatibles:
+       * "rockchip,rk3228-hdmi-phy",
+       * "rockchip,rk3328-hdmi-phy";
+ - reg : Address and length of the hdmi phy control register set
+ - clocks : phandle + clock specifier for the phy clocks
+ - clock-names : string, clock name, must contain "sysclk" for system
+         control and register configuration, "refoclk" for crystal-
+         oscillator reference PLL clock input and "refpclk" for pclk-
+         based refeference PLL clock input.
+ - #clock-cells: should be 0.
+ - clock-output-names : shall be the name for the output clock.
+ - interrupts : phandle + interrupt specified for the hdmiphy interrupt
+ - #phy-cells : must be 0. See ./phy-bindings.txt for details.
+
+Optional properties for rk3328-hdmi-phy:
+ - nvmem-cells = phandle + nvmem specifier for the cpu-version efuse
+ - nvmem-cell-names : "cpu-version" to read the chip version, required
+         for adjustment to some frequency settings
+
+Example:
+       hdmi_phy: hdmi-phy@12030000 {
+               compatible = "rockchip,rk3228-hdmi-phy";
+               reg = <0x12030000 0x10000>;
+               #phy-cells = <0>;
+               clocks = <&cru PCLK_HDMI_PHY>, <&xin24m>, <&cru DCLK_HDMIPHY>;
+               clock-names = "sysclk", "refoclk", "refpclk";
+               #clock-cells = <0>;
+               clock-output-names = "hdmi_phy";
+               status = "disabled";
+       };
+
+Then the PHY can be used in other nodes such as:
+
+       hdmi: hdmi@200a0000 {
+               compatible = "rockchip,rk3228-dw-hdmi";
+               ...
+               phys = <&hdmi_phy>;
+               phy-names = "hdmi";
+               ...
+       };