This patch adds a new documentation for Renesas R-Car USB 3.0 role
switch that can change the USB 3.0 role to either host or peripheral
by a hardware register that is included in USB3.0 peripheral module.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
.../bindings/usb/renesas,rcar-usb3-role-sw.txt | 47 ++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/renesas,rcar-usb3-role-sw.txt
diff --git a/Documentation/devicetree/bindings/usb/renesas,rcar-usb3-role-sw.txt b/Documentation/devicetree/bindings/usb/renesas,rcar-usb3-role-sw.txt
new file mode 100644
index 0000000..e074c03
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/renesas,rcar-usb3-role-sw.txt
@@ -0,0 +1,47 @@
+Renesas Electronics R-Car USB 3.0 role switch
+
+A renesas_usb3's node can contain this node.
+
+Required properties:
+ - compatible: Must contain "renesas,rcar-usb3-role-switch".
+
+Required nodes:
+ - The connection to a usb3.0 host node needs by using OF graph bindings.
+ - port@0 = USB 3.0 host port
+ - port@1 = USB 3.0 peripheral port
+
+Example of R-Car H3 ES2.0:
+ usb3_peri0: usb@ee020000 {
+ compatible = "renesas,r8a7795-usb3-peri",
+ "renesas,rcar-gen3-usb3-peri";
+ reg = <0 0xee020000 0 0x400>;
+ interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cpg CPG_MOD 328>;
+ power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
+ resets = <&cpg 328>;
+
+ usb3-role-sw {
+ compatible = "renesas,rcar-usb3-role-switch";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ usb3_host_sw: endpoint {
+ remote-endpoint = <&usb3_host_ep>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ usb3_peri_sw: endpoint {
+ remote-endpoint = <&usb3_peri_ep>;
+ };
+ };
+ };
+ };
+ };
--
1.9.1
