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    Subject[PATCH v2 1/3] dt-bindings: phy: Add Cygnus usb phy binding
    Date
    Add devicetree binding document for broadcom's
    Cygnus SoC specific usb phy controller driver.

    Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
    ---
    .../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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