dt-bindings: phy: Add documentation for NSP USB3 PHY
Add documentation for USB3 PHY available in Northstar plus SoC Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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Documentation/devicetree/bindings/phy/brcm,nsp-usb3-phy.txt
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Documentation/devicetree/bindings/phy/brcm,nsp-usb3-phy.txt
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Broadcom USB3 phy binding for northstar plus SoC
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The USB3 phy is internal to the SoC and is accessed using mdio interface.
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Required mdio bus properties:
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- reg: Should be 0x0 for SoC internal USB3 phy
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- #address-cells: must be 1
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- #size-cells: must be 0
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Required USB3 PHY properties:
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- compatible: should be "brcm,nsp-usb3-phy"
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- reg: USB3 Phy address on SoC internal MDIO bus and it should be 0x10.
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- usb3-ctrl-syscon: handler of syscon node defining physical address
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of usb3 control register.
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- #phy-cells: must be 0
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Required usb3 control properties:
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- compatible: should be "brcm,nsp-usb3-ctrl"
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- reg: offset and length of the control registers
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Example:
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mdio@0 {
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reg = <0x0>;
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#address-cells = <1>;
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#size-cells = <0>;
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usb3_phy: usb-phy@10 {
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compatible = "brcm,nsp-usb3-phy";
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reg = <0x10>;
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usb3-ctrl-syscon = <&usb3_ctrl>;
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#phy-cells = <0>;
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status = "disabled";
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};
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};
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usb3_ctrl: syscon@104408 {
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compatible = "brcm,nsp-usb3-ctrl", "syscon";
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reg = <0x104408 0x3fc>;
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};
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