dt-bindings: Add a binding for Mediatek xHCI host controller

add a DT binding documentation of xHCI host controller for the
MT8173 SoC from Mediatek.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/mt8173-xhci.txt b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
new file mode 100644 (file)
index 0000000..b3a7ffa
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
@@ -0,0 +1,51 @@
+MT8173 xHCI
+
+The device node for Mediatek SOC USB3.0 host controller
+
+Required properties:
+ - compatible : should contain "mediatek,mt8173-xhci"
+ - reg : specifies physical base address and size of the registers,
+       the first one for MAC, the second for IPPC
+ - 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": for clock of xHCI MAC
+       "wakeup_deb_p0": for USB wakeup debounce clock of port0
+       "wakeup_deb_p1": for USB wakeup debounce clock of port1
+
+ - phys : a list of phandle + phy specifier pairs
+
+Optional properties:
+ - mediatek,wakeup-src : 1: ip sleep wakeup mode; 2: line state wakeup
+       mode;
+ - mediatek,syscon-wakeup : phandle to syscon used to access USB wakeup
+       control register, it depends on "mediatek,wakeup-src".
+ - 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>,
+             <0 0x11280700 0 0x0100>;
+       interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
+       power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
+       clocks = <&topckgen CLK_TOP_USB30_SEL>,
+                <&pericfg CLK_PERI_USB0>,
+                <&pericfg CLK_PERI_USB1>;
+       clock-names = "sys_ck",
+                     "wakeup_deb_p0",
+                     "wakeup_deb_p1";
+       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>;
+       mediatek,wakeup-src = <1>;
+};