Add devicetree binding document for broadcom's
Cygnus SoC specific usb phy controller driver.
Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@xxxxxxxxxxxx>
---
.../bindings/phy/brcm,cygnus-usb-phy.txt | 106 +++++++++++++++++++++
1 file changed, 106 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..bbc4b94
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
@@ -0,0 +1,106 @@
+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,
+ 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: usb-phy@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@0 {
+ reg = <0>;
+ #phy-cells = <1>;
+ };
+
+ usbphy1: usb-phy@1 {
+ reg = <1>;
+ #phy-cells = <1>;
+ };
+
+ usbphy2: usb-phy@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 or host */
+
+ ehci0: usb@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: usb@1804c000 {
+ compatible = "iproc-udc";
+ reg = <0x1804c000 0x2000>;
+ interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
+ phys = <&usbphy2 2>;
+ phy-names = "usbdrd";
+ };
--
1.9.1
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