[PATCH v3 4/7] dt-bindings: phy: Add document for phy-mtk-ufs

[Stanley Chu <stanley.chu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>]

Add UFS M-PHY node document for MediaTek SoC chips.

Signed-off-by: Stanley Chu <stanley.chu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
 .../devicetree/bindings/phy/phy-mtk-ufs.txt   | 35 +++++++++++++++++++
 1 file changed, 35 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..5fc22c7fe0bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-mtk-ufs.txt
@@ -0,0 +1,35 @@
+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,ufs-mphy"
+- 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:
+
+	ufs_mphy: ufs_mphy@11fa0000 {
+		compatible = "mediatek,ufs-mphy";
+		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:ufshci@11270000 {
+		...
+		phys = <&ufs_mphy>;
+	};
-- 
2.18.0