Add UFS and UFS PHY node document for Mediatek SoC chips.
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
---
.../devicetree/bindings/ufs/ufs-mediatek.txt | 47 +++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/ufs/ufs-mediatek.txt
diff --git a/Documentation/devicetree/bindings/ufs/ufs-mediatek.txt b/Documentation/devicetree/bindings/ufs/ufs-mediatek.txt
new file mode 100644
index 000000000000..5fc985928b3e
--- /dev/null
+++ b/Documentation/devicetree/bindings/ufs/ufs-mediatek.txt
@@ -0,0 +1,47 @@
+* Mediatek Universal Flash Storage (UFS) Host Controller
+
+UFS nodes are defined to describe on-chip UFS hardware macro.
+Each UFS Host Controller should have its own node.
+
+To bind UFS PHY with UFS host controller, the controller node should
+contain a phandle reference to UFS M-PHY node.
+
+Required properties for UFS nodes:
+- compatible : Compatible list, contains the following controller:
+ "mediatek,ufshci"
+- reg : Address and length of the UFS register set.
+- interrupt-parent : Interrupt device.
+- phys : phandle to m-phy.
+- 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. "ufs-clk" is mandatory.
+- freq-table-hz : Array of <min max> operating frequencies stored in the same
+ order as the clocks property. If this property is not
+ defined or a value in the array is "0" then it is assumed
+ that the frequency is set by the parent clock or a
+ fixed rate clock source.
+- vcc-supply : Power to the UFS device.
+- vcc-fixed-regulator: Specify that vcc-supply is a fixed regulator.
+- lanes-per-direction: Number of lanes available per direction. Shall be 1.
+
+Example:
+
+ ufs_mphy: ufs_mphy@11fa0000 {
+ ...
+ };
+
+ ufshci:ufshci@11270000 {
+ compatible = "mediatek,ufshci";
+ reg = <0 0x11270000 0 0x2300>;
+ interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_LOW>;
+ phys = <&ufs_mphy>;
+
+ clocks = <&infracfg_ao INFRACFG_AO_UFS_CG>;
+ clock-names = "ufs-clk";
+ freq-table-hz = <0 0>;
+
+ vcc-supply = <&mt_pmic_vemc_ldo_reg>;
+ vcc-fixed-regulator;
+
+ lanes-per-direction = <1>;
+ };
--
2.18.0
