ARM: dts: keystone: Add usb phy devicetree bindings

Added device tree support for TI's Keystone USB PHY 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>

2 files changed, 28 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/keystone-phy.txt b/Documentation/devicetree/bindings/usb/keystone-phy.txt
new file mode 100644
index 000000000000..f37b3a86341d
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/keystone-phy.txt
@@ -0,0 +1,20 @@
+TI Keystone USB PHY
+
+Required properties:
+ - compatible: should be "ti,keystone-usbphy".
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+   with 'reg' property.
+ - reg : Address and length of the usb phy control register set.
+
+The main purpose of this PHY driver is to enable the USB PHY reference clock
+gate on the Keystone SOC for both the USB2 and USB3 PHY. Otherwise it is just
+an NOP PHY driver.  Hence this node is referenced as both the usb2 and usb3
+phy node in the USB Glue layer driver node.
+
+usb_phy: usb_phy@2620738 {
+        compatible = "ti,keystone-usbphy";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        reg = <0x2620738 32>;
+        status = "disabled";
+};
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index f6d6d9e5effd..276bea999ef4 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -181,5 +181,13 @@
                         interrupts = <GIC_SPI 300 IRQ_TYPE_EDGE_RISING>;
                         clocks = <&clkspi>;
                 };
+
+                usb_phy: usb_phy@2620738 {
+                        compatible = "ti,keystone-usbphy";
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        reg = <0x2620738 32>;
+                        status = "disabled";
+                };
         };
 };