[PATCH 2/3] ARM: dts: keystone: Add usb devicetree bindings

[WingMan Kwok]

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

On Keystone II platforms, we use no-op phy driver.

Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
Signed-off-by: WingMan Kwok <w-kwok2 at ti.com>
---
 .../devicetree/bindings/usb/keystone-usb.txt       |   43 ++++++++++++++++++++
 arch/arm/boot/dts/keystone.dtsi                    |   27 ++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/keystone-usb.txt

diff --git a/Documentation/devicetree/bindings/usb/keystone-usb.txt b/Documentation/devicetree/bindings/usb/keystone-usb.txt
new file mode 100644
index 0000000..a67de8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/keystone-usb.txt
@@ -0,0 +1,43 @@
+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 device. First pair
+   is the USB subsystem specific register set.  Second pair is the
+   USB subsystem PHY control register set.
+ - 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 at 2680000 {
+		compatible = "ti,keystone-dwc3";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x2680000 0x10000
+		       0x2620738 32>;
+		clocks = <&clkusb>;
+		clock-names = "usb";
+		interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+		ranges;
+
+		dwc3 at 2690000 {
+			compatible = "synopsys,dwc3";
+			reg = <0x2690000 0x70000>;
+			interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+			usb-phy = <&usb2_phy>, <&usb3_phy>;
+		};
+	};
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index f6d6d9e..1e1049c 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -181,5 +181,32 @@
 			interrupts = <GIC_SPI 300 IRQ_TYPE_EDGE_RISING>;
 			clocks = <&clkspi>;
 		};
+
+		usb2_phy: usb2_phy {
+			compatible = "usb-nop-xceiv";
+		};
+
+		usb3_phy: usb3_phy {
+			compatible = "usb-nop-xceiv";
+		};
+
+		usb: usb at 2680000 {
+			compatible = "ti,keystone-dwc3";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0x2680000 0x10000
+			       0x2620738 32>;
+			clocks = <&clkusb>;
+			clock-names = "usb";
+			interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+			ranges;
+
+			dwc3 at 2690000 {
+				compatible = "synopsys,dwc3";
+				reg = <0x2690000 0x70000>;
+				interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
+				usb-phy = <&usb2_phy>, <&usb3_phy>;
+			};
+		};
 	};
 };
-- 
1.7.9.5