MT8173 xHCI The device node for Mediatek SOC USB3.0 host controller There are two scenarios: the first one only supports xHCI driver; the second one supports dual-role mode, and the host is based on xHCI driver. Take account of backward compatibility, we divide bindings into two parts. 1st: only supports xHCI driver ------------------------------------------------------------------------ Required properties: - compatible : should be "mediatek,-xhci", "mediatek,mtk-xhci", soc-model is the name of SoC, such as mt8173, mt2712 etc, when using "mediatek,mtk-xhci" compatible string, you need SoC specific ones in addition, one of: - "mediatek,mt8173-xhci" - reg : specifies physical base address and size of the registers - reg-names: should be "mac" for xHCI MAC and "ippc" for IP port control - interrupts : interrupt used by the controller - power-domains : a phandle to USB power domain node to control USB's mtcmos - vusb33-supply : regulator of USB avdd3.3v - clocks : a list of phandle + clock-specifier pairs, one for each entry in clock-names - clock-names : must contain "sys_ck": controller clock used by normal mode, the following ones are optional: "ref_ck": reference clock used by low power mode etc, "mcu_ck": mcu_bus clock for register access, "dma_ck": dma_bus clock for data transfer by DMA, "xhci_ck": controller clock - phys : see usb-hcd.yaml in the current directory Optional properties: - wakeup-source : enable USB remote wakeup; - mediatek,syscon-wakeup : phandle to syscon used to access the register of the USB wakeup glue layer between xHCI and SPM; it depends on "wakeup-source", and has two arguments: - the first one : register base address of the glue layer in syscon; - the second one : hardware version of the glue layer - 1 : used by mt8173 etc - 2 : used by mt2712 etc - mediatek,u3p-dis-msk : mask to disable u3ports, bit0 for u3port0, bit1 for u3port1, ... etc; - vbus-supply : reference to the VBUS regulator; - usb3-lpm-capable : supports USB3.0 LPM - pinctrl-names : a pinctrl state named "default" must be defined - pinctrl-0 : pin control group See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt - imod-interval-ns: default interrupt moderation interval is 5000ns additionally the properties from usb-hcd.yaml (in the current directory) are supported. Example: usb30: usb@11270000 { compatible = "mediatek,mt8173-xhci"; reg = <0 0x11270000 0 0x1000>, <0 0x11280700 0 0x0100>; reg-names = "mac", "ippc"; interrupts = ; power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>; clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>, <&pericfg CLK_PERI_USB0>, <&pericfg CLK_PERI_USB1>; clock-names = "sys_ck", "ref_ck"; phys = <&phy_port0 PHY_TYPE_USB3>, <&phy_port1 PHY_TYPE_USB2>; vusb33-supply = <&mt6397_vusb_reg>; vbus-supply = <&usb_p1_vbus>; usb3-lpm-capable; mediatek,syscon-wakeup = <&pericfg 0x400 1>; wakeup-source; imod-interval-ns = <10000>; }; 2nd: dual-role mode with xHCI driver ------------------------------------------------------------------------ In the case, xhci is added as subnode to mtu3. An example and the DT binding details of mtu3 can be found in: Documentation/devicetree/bindings/usb/mediatek,mtu3.txt Required properties: - compatible : should be "mediatek,-xhci", "mediatek,mtk-xhci", soc-model is the name of SoC, such as mt8173, mt2712 etc, when using "mediatek,mtk-xhci" compatible string, you need SoC specific ones in addition, one of: - "mediatek,mt8173-xhci" - reg : specifies physical base address and size of the registers - reg-names: should be "mac" for xHCI MAC - interrupts : interrupt used by the host controller - power-domains : a phandle to USB power domain node to control USB's mtcmos - vusb33-supply : regulator of USB avdd3.3v - clocks : a list of phandle + clock-specifier pairs, one for each entry in clock-names - clock-names : must contain "sys_ck", and the following ones are optional: "ref_ck", "mcu_ck" and "dma_ck", "xhci_ck" Optional properties: - vbus-supply : reference to the VBUS regulator; - usb3-lpm-capable : supports USB3.0 LPM Example: usb30: usb@11270000 { compatible = "mediatek,mt8173-xhci"; reg = <0 0x11270000 0 0x1000>; reg-names = "mac"; interrupts = ; power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>; clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>; clock-names = "sys_ck", "ref_ck"; vusb33-supply = <&mt6397_vusb_reg>; usb3-lpm-capable; };