add ufs node document for Hisilicon.
Signed-off-by: Li Wei <liwei213@xxxxxxxxxx>
---
Documentation/devicetree/bindings/ufs/ufs-hisi.txt | 47 ++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/ufs/ufs-hisi.txt
diff --git a/Documentation/devicetree/bindings/ufs/ufs-hisi.txt b/Documentation/devicetree/bindings/ufs/ufs-hisi.txt
new file mode 100644
index 000000000000..ee114a65143d
--- /dev/null
+++ b/Documentation/devicetree/bindings/ufs/ufs-hisi.txt
@@ -0,0 +1,47 @@
+* Hisilicon 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.
+
+Required properties:
+- compatible : compatible list, contains one of the following -
+ "hisilicon,hi3660-ufs" for hisi ufs host controller
+ present on Hi3660 chipset.
+- reg : should contain UFS register address space & UFS SYS CTRL register address,
+- interrupt-parent : interrupt device
+- interrupts : interrupt number
+- 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. "clk_ref", "clk_phy" is optional
+- resets : reset node register, one reset the clk and the other reset the controller
+- reset-names : describe reset node register
+
+Optional properties for board device:
+- reset-gpio : specifies to reset devices
+
+Example:
+
+ ufs: ufs@ff3b0000 {
+ compatible = "hisilicon,hi3660-ufs", "jedec,ufs-1.1";
+ /* 0: HCI standard */
+ /* 1: UFS SYS CTRL */
+ reg = <0x0 0xff3b0000 0x0 0x1000>,
+ <0x0 0xff3b1000 0x0 0x1000>;
+ interrupt-parent = <&gic>;
+ interrupts = <GIC_SPI 278 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&crg_ctrl HI3660_CLK_GATE_UFSIO_REF>,
+ <&crg_ctrl HI3660_CLK_GATE_UFSPHY_CFG>;
+ clock-names = "clk_ref", "clk_phy";
+ freq-table-hz = <0 0>, <0 0>;
+ /* offset: 0x84; bit: 12 */
+ /* offset: 0x84; bit: 7 */
+ resets = <&crg_rst 0x84 12>,
+ <&crg_rst 0x84 7>;
+ reset-names = "rst", "assert";
+ };
+
+ &ufs {
+ reset-gpio = <&gpio18 1 0>;
+ status = "okay";
+ };
+
--
2.11.0
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