[PATCH 1/3] Documentation: DT: Add Cygnus usb phy binding

[Raveendra Padasalagi]

Add devicetree binding document for broadcom's
Cygnus SoC specific usb phy controller driver.

Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi at broadcom.com>
---
 .../bindings/phy/brcm,cygnus-usb-phy.txt           | 101 +++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
new file mode 100644
index 0000000..2d99fea
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
@@ -0,0 +1,101 @@
+BROADCOM CYGNUS USB PHY
+
+Required Properties:
+- compatible:  brcm,cygnus-usb-phy
+- reg : the register start address and length for crmu_usbphy_aon_ctrl,
+  cdru usb phy control and reset registers, usb host idm registers,
+  usb device idm registers.
+- reg-names: a list of the names corresponding to the previous register
+  ranges. Should contain "crmu-usbphy-aon-ctrl", "cdru-usbphy",
+  "usb2h-idm", "usb2d-idm".
+- address-cells: should be 1
+- size-cells: should be 0
+
+Sub-nodes:
+  Each port's PHY should be represented as a sub-node.
+
+Sub-nodes required properties:
+- reg: the PHY number
+- #phy-cells must be 1
+  The node that uses the phy must provide 1 integer argument specifying
+  port number.
+
+Optional Properties:
+- vbus-p#-supply : The regulator for vbus out control for the host
+  functionality enabled ports.
+- vbus-gpios: vbus gpio binding
+  This is mandatory for port 2, as port 2 is used as dual role phy.
+  Based on the vbus and id values device or host role is determined
+  for phy 2.
+
+- extcon: extcon phandle
+  This is mandatory for port 2,  as port 2 is used as dual role phy.
+  extcon should be phandle to external usb gpio module which provide
+  device or host role notifications based on the ID and VBUS gpio's state.
+
+
+Refer to phy/phy-bindings.txt for the generic PHY binding properties
+
+NOTE: port 0 and port 1 are host only and port 2 is dual role port.
+
+Example of phy :
+	usbphy: phy at 0301c028 {
+		compatible = "brcm,cygnus-usb-phy";
+		reg = <0x0301c028 0x4>,
+		      <0x0301d1b4 0x5c>,
+		      <0x18115000 0xa00>,
+		      <0x18111000 0xa00>;
+		reg-names = "crmu-usbphy-aon-ctrl", "cdru-usbphy",
+			    "usb2h-idm", "usb2d-idm";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		usbphy0: usb-phy at 0 {
+			reg = <0>;
+			#phy-cells = <1>;
+		};
+
+		usbphy1: usb-phy at 1 {
+			reg = <1>;
+			#phy-cells = <1>;
+		};
+
+		usbphy2: usb-phy at 2 {
+			reg = <2>;
+			#phy-cells = <1>;
+			extcon = <&extcon_usb>;
+		};
+	};
+
+	extcon_usb: extcon_usb {
+		compatible = "linux,extcon-usb-gpio";
+		vbus-gpio = <&gpio_asiu 121 0>;
+		id-gpio = <&gpio_asiu 122 0>;
+		status = "okay";
+	};
+
+
+Example of node using the phy:
+
+	/* This nodes declares all three ports, port 0
+	and port 1 are host and port 2 is device */
+
+	ehci0: usb at 18048000 {
+		compatible = "generic-ehci";
+		reg = <0x18048000 0x100>;
+		interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
+		phys = <&usbphy0 0 &usbphy1 1 &usbphy2 2>;
+		phy-names = "usbp0","usbp1","usbp2";
+		status = "okay";
+	};
+
+	/* This node declares port 2 phy
+	and configures it for device */
+
+	usbd_udc_dwc1: usbd_udc_dwc at 1804c000 {
+		compatible = "iproc-udc";
+		reg = <0x1804c000 0x2000>;
+		interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
+		phys = <&usbphy2 2>;
+		phy-names = "usbdrd";
+	};
-- 
1.9.1