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>

3 files changed, 69 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 000000000000..60527d335b58
--- /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>;
+                };
+        };
diff --git a/arch/arm/boot/dts/k2hk-evm.dts b/arch/arm/boot/dts/k2hk-evm.dts
index 15b3a95f5e3a..eaefdfef65c3 100644
--- a/arch/arm/boot/dts/k2hk-evm.dts
+++ b/arch/arm/boot/dts/k2hk-evm.dts
@@ -53,3 +53,11 @@
                 };
         };
 };
+
+&usb_phy {
+        status = "okay";
+};
+
+&usb {
+        status = "okay";
+};
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index 276bea999ef4..b4202907a27b 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -189,5 +189,24 @@
                         reg = <0x2620738 32>;
                         status = "disabled";
                 };
+
+                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>;
+                        };
+                };
         };
 };