dt-bindings: Add usb3.0 phy binding for MT65xx SoCs

add a DT binding documentation of usb3.0 phy for MT65xx
SoCs from Mediatek.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-mt65xx-usb.txt b/Documentation/devicetree/bindings/phy/phy-mt65xx-usb.txt
new file mode 100644 (file)
index 0000000..00100cf
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-mt65xx-usb.txt
@@ -0,0 +1,68 @@
+mt65xx USB3.0 PHY binding
+--------------------------
+
+This binding describes a usb3.0 phy for mt65xx platforms of Medaitek SoC.
+
+Required properties (controller (parent) node):
+ - compatible  : should be "mediatek,mt8173-u3phy"
+ - reg         : offset and length of register for phy, exclude port's
+                 register.
+ - clocks      : a list of phandle + clock-specifier pairs, one for each
+                 entry in clock-names
+ - clock-names : must contain
+                 "u3phya_ref": for reference clock of usb3.0 analog phy.
+
+Required nodes : a sub-node is required for each port the controller
+                 provides. Address range information including the usual
+                 'reg' property is used inside these nodes to describe
+                 the controller's topology.
+
+Required properties (port (child) node):
+- reg          : address and length of the register set for the port.
+- #phy-cells   : should be 1 (See second example)
+                 cell after port phandle is phy type from:
+                       - PHY_TYPE_USB2
+                       - PHY_TYPE_USB3
+
+Example:
+
+u3phy: usb-phy@11290000 {
+       compatible = "mediatek,mt8173-u3phy";
+       reg = <0 0x11290000 0 0x800>;
+       clocks = <&apmixedsys CLK_APMIXED_REF2USB_TX>;
+       clock-names = "u3phya_ref";
+       #address-cells = <2>;
+       #size-cells = <2>;
+       ranges;
+       status = "okay";
+
+       phy_port0: port@11290800 {
+               reg = <0 0x11290800 0 0x800>;
+               #phy-cells = <1>;
+               status = "okay";
+       };
+
+       phy_port1: port@11291000 {
+               reg = <0 0x11291000 0 0x800>;
+               #phy-cells = <1>;
+               status = "okay";
+       };
+};
+
+Specifying phy control of devices
+---------------------------------
+
+Device nodes should specify the configuration required in their "phys"
+property, containing a phandle to the phy port node and a device type;
+phy-names for each port are optional.
+
+Example:
+
+#include <dt-bindings/phy/phy.h>
+
+usb30: usb@11270000 {
+       ...
+       phys = <&phy_port0 PHY_TYPE_USB3>;
+       phy-names = "usb3-0";
+       ...
+};