ARM: dts: keystone: Add usb devicetree bindings

Added device tree support for TI's Keystone USB driver and updated the
Documentation with device tree binding information.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/keystone-usb.txt b/Documentation/devicetree/bindings/usb/keystone-usb.txt
new file mode 100644
index 00000000000..60527d335b5
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/keystone-usb.txt
@@ -0,0 +1,42 @@
+TI Keystone Soc USB Controller
+
+DWC3 GLUE
+
+Required properties:
+ - compatible: should be "ti,keystone-dwc3".
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+   with 'reg' property.
+ - reg : Address and length of the register set for the USB subsystem on
+   the SOC.
+ - interrupts : The irq number of this device that is used to interrupt the
+   MPU.
+ - ranges: allows valid 1:1 translation between child's address space and
+   parent's address space.
+ - clocks: Clock IDs array as required by the controller.
+ - clock-names: names of clocks correseponding to IDs in the clock property.
+
+Sub-nodes:
+The dwc3 core should be added as subnode to Keystone DWC3 glue.
+- dwc3 :
+   The binding details of dwc3 can be found in:
+   Documentation/devicetree/bindings/usb/dwc3.txt
+
+Example:
+	usb: usb@2680000 {
+		compatible = "ti,keystone-dwc3";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x2680000 0x10000>;
+		clocks = <&clkusb>;
+		clock-names = "usb";
+		interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+		ranges;
+		status = "disabled";
+
+		dwc3@2690000 {
+			compatible = "synopsys,dwc3";
+			reg = <0x2690000 0x70000>;
+			interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+			usb-phy = <&usb_phy>, <&usb_phy>;
+		};
+	};