dt-bindings: regulator: add DT bindings for UniPhier regulator

Add DT bindings for regulators implemented in UniPhier SoCs.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/uniphier-regulator.txt b/Documentation/devicetree/bindings/regulator/uniphier-regulator.txt
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+Socionext UniPhier Regulator Controller
+
+This describes the devicetree bindings for regulator controller implemented
+on Socionext UniPhier SoCs.
+
+USB3 Controller
+---------------
+
+This regulator controls VBUS and belongs to USB3 glue layer. Before using
+the regulator, it is necessary to control the clocks and resets to enable
+this layer. These clocks and resets should be described in each property.
+
+Required properties:
+- compatible: Should be
+    "socionext,uniphier-pro4-usb3-regulator" - for Pro4 SoC
+    "socionext,uniphier-pxs2-usb3-regulator" - for PXs2 SoC
+    "socionext,uniphier-ld20-usb3-regulator" - for LD20 SoC
+    "socionext,uniphier-pxs3-usb3-regulator" - for PXs3 SoC
+- reg: Specifies offset and length of the register set for the device.
+- clocks: A list of phandles to the clock gate for USB3 glue layer.
+       According to the clock-names, appropriate clocks are required.
+- clock-names: Should contain
+    "gio", "link" - for Pro4 SoC
+    "link"        - for others
+- resets: A list of phandles to the reset control for USB3 glue layer.
+       According to the reset-names, appropriate resets are required.
+- reset-names: Should contain
+    "gio", "link" - for Pro4 SoC
+    "link"        - for others
+
+See Documentation/devicetree/bindings/regulator/regulator.txt
+for more details about the regulator properties.
+
+Example:
+
+       usb-glue@65b00000 {
+               compatible = "socionext,uniphier-ld20-dwc3-glue",
+                            "simple-mfd";
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges = <0 0x65b00000 0x400>;
+
+               usb_vbus0: regulators@100 {
+                       compatible = "socionext,uniphier-ld20-usb3-regulator";
+                       reg = <0x100 0x10>;
+                       clock-names = "link";
+                       clocks = <&sys_clk 14>;
+                       reset-names = "link";
+                       resets = <&sys_rst 14>;
+               };
+
+               phy {
+                       ...
+                       phy-supply = <&usb_vbus0>;
+               };
+               ...
+       };