Add UFS M-PHY node document for MediaTek SoC chips.
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
---
.../devicetree/bindings/phy/phy-mtk-ufs.txt | 36 +++++++++++++++++++
1 file changed, 36 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/phy-mtk-ufs.txt
diff --git a/Documentation/devicetree/bindings/phy/phy-mtk-ufs.txt b/Documentation/devicetree/bindings/phy/phy-mtk-ufs.txt
new file mode 100644
index 000000000000..dc6c9933b08d
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-mtk-ufs.txt
@@ -0,0 +1,36 @@
+MediaTek Universal Flash Storage (UFS) M-PHY binding
+--------------------------------------------------------
+
+UFS M-PHY nodes are defined to describe on-chip UFS M-PHY hardware macro.
+Each UFS M-PHY node should have its own node.
+
+To bind UFS M-PHY with UFS host controller, the controller node should
+contain a phandle reference to UFS M-PHY node.
+
+Required properties for UFS M-PHY nodes:
+- compatible : Compatible list, contains the following controller:
+ "mediatek,mt8183-ufsphy" for ufs phy
+ persent on MT81xx chipsets.
+- reg : Address and length of the UFS M-PHY register set.
+- #phy-cells : This property shall be set to 0
+- clocks : List of phandle and clock specifier pairs.
+- clock-names : List of clock input name strings sorted in the same
+ order as the clocks property. "unipro-clk" and
+ "mp-clk" are mandatory.
+
+Example:
+
+ ufsphy: phy@11fa0000 {
+ compatible = "mediatek,mt8183-ufsphy";
+ reg = <0 0x11fa0000 0 0xc000>;
+ #phy-cells = <0>;
+
+ clocks = <&infracfg_ao INFRACFG_AO_UNIPRO_SCK_CG>,
+ <&infracfg_ao INFRACFG_AO_UFS_MP_SAP_BCLK_CG>;
+ clock-names = "unipro-clk", "mp-clk";
+ };
+
+ ufshci@11270000 {
+ ...
+ phys = <&ufsphy>;
+ };
--
2.18.0
