[PATCH 1/3] dt-bindings: phy: Add bindings for the SMSC USB333x ULPI USB PHY

[Paul Kocialkowski]

Introduce the device-tree bindings for this ULPI USB PHY.
Optional bindings that are not prefixed with the vendor may be
relevant to other ULPI USB PHYs since they match generic ULPI
registers.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
---
 .../devicetree/bindings/phy/smsc-usb333x.txt  | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/smsc-usb333x.txt

diff --git a/Documentation/devicetree/bindings/phy/smsc-usb333x.txt b/Documentation/devicetree/bindings/phy/smsc-usb333x.txt
new file mode 100644
index 000000000000..50d500d67b2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/smsc-usb333x.txt
@@ -0,0 +1,50 @@
+Device tree bindings for SMSC USB333x ULPI USB PHY
+
+Required properties:
+- compatible: Should be "smsc,usb333x".
+
+Optional properties:
+- reset-gpios: GPIO to reset the PHY.
+- clocks: Reference clock that feeds the PHY's PLL.
+- clock-names: Should be "refclk" for the reference clock.
+- extvbus-passthru: Enable EXTVBUS signal pass-through to assert the VbusValid
+  signal internally. This is useful when no VBUS line is connected to the PHY.
+- auto-resume: Enable automatic transmission resume (in host mode).
+- chrg-vbus: Enable internal VBUS pull-up to 3.3 V during OTG SRP.
+- dischrg-vbus: Enable internal VBUS pull-down during OTG SRP.
+- id-pull-up: Enable internal ID pull-up tp 3.3 V.
+- smsc,varisense: Squelch detector threshold register field value, as described
+  in the datasheet.
+- smsc,phyboost: Output voltage change register field value, as described in the
+  datasheet.
+
+Refer to phy/phy-bindings.txt for the generic PHY binding properties.
+Refer to usb/ulpi.txt for the parent ULPI bus binding required for this PHY.
+
+Example:
+
+&usb0 {
+	compatible = "xlnx,zynq-usb-2.20a", "chipidea,usb2";
+	clocks = <&clkc 28>;
+	interrupt-parent = <&intc>;
+	interrupts = <0 21 4>;
+	reg = <0xe0002000 0x1000>;
+	dr_mode = "peripheral";
+	phys = <&usb_phy0>;
+	phy-names = "usb-phy";
+	phy_type = "ulpi";
+
+	ulpi {
+		usb_phy0: usb-phy0 {
+			#phy-cells = <0>;
+			compatible = "smsc,usb333x";
+			reset-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
+			clocks = <&usb_phy_clk>;
+			clock-names = "refclk";
+			smsc,varisense = <1>;
+			smsc,phyboost = <5>;
+			extvbus-passthru;
+			chrg-vbus;
+		};
+	};
+};
-- 
2.20.1