[PATCH 1/4] dt-bindings: dwc3: add binding documentation for UniPhier dwc3 glue driver

[Kunihiko Hayashi]

Add devicetree binding documentation for dwc3 glue driver implemented
on Socionext UniPhier SoCs.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
---
 .../devicetree/bindings/usb/dwc3-uniphier.txt      | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/dwc3-uniphier.txt

diff --git a/Documentation/devicetree/bindings/usb/dwc3-uniphier.txt b/Documentation/devicetree/bindings/usb/dwc3-uniphier.txt
new file mode 100644
index 0000000..677e072
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3-uniphier.txt
@@ -0,0 +1,58 @@
+UniPhier DWC3 glue layer
+
+This describes the devicetree bindings for dwc3-uniphier driver implemented on
+Socionext UniPhier SoCs.
+
+Required properties:
+- compatible:
+  - "socionext,uniphier-pxs2-dwc3" : For UniPhier PXs2 SoC
+  - "socionext,uniphier-ld20-dwc3" : For UniPhier LD20 SoC
+- reg: Address and range of the glue logic
+- clocks: List of phandles for the clocks, and the number of phandles depends
+	  on SoC platform.
+
+Optional properties:
+- resets: List of phandles for the resets, and the number of phandles depends
+	on SoC platform.
+- nvmem-cells: Phandles to nvmem cell that contains the trimming data.
+	Available only for LD20, and if unspecified, default value is used.
+- nvmem-cell-names: Should be the following names, which correspond to each
+	nvmem-cells. N is the number indicating a port of phy.
+	All of the 3 parameters associated with the following names are
+	required for each port, if any one is omitted, the trimming data
+	of the port will not be set at all.
+	- "rtermN", "sel_tN", "hs_iN" : Each cell name for phy parameters
+
+Required child node:
+A child node must exist to represent the core DWC3 IP block. The name of
+the node is not important. The content of the node is defined in dwc3.txt.
+
+Example:
+
+	usb: usb@65b00000 {
+		compatible = "socionext,uniphier-ld20-dwc3";
+		reg = <0x65b00000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		clocks = <&sys_clk 14>, <&sys_clk 16>, <&sys_clk 17>;
+		resets = <&sys_rst 12>, <&sys_rst 16>, <&sys_rst 17>,
+			 <&sys_rst 18>, <&sys_rst 19>;
+		nvmem-cells = <&usb_rterm0>, <&usb_rterm1>,
+			      <&usb_rterm2>, <&usb_rterm3>,
+			      <&usb_sel_t0>, <&usb_sel_t1>,
+			      <&usb_sel_t2>, <&usb_sel_t3>,
+			      <&usb_hs_i0>,  <&usb_hs_i0>,
+			      <&usb_hs_i2>,  <&usb_hs_i2>;
+		nvmem-cell-names = "rterm0", "rterm1", "rterm2", "rterm3",
+				   "sel_t0", "sel_t1", "sel_t2", "sel_t3",
+				   "hs_i0",  "hs_i1",  "hs_i2",  "hs_i3";
+		ranges;
+
+		dwc3@65a00000 {
+			compatible = "snps,dwc3";
+			reg = <0x65a00000 0xcd00>;
+			interrupt-names = "host";
+			interrupts = <0 134 4>;
+			dr_mode = "host";
+		};
+	};
-- 
2.7.4