It's used to support dual role switch via GPIO when use Type-B
receptacle, typically the USB ID pin is connected to an input
GPIO pin
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
---
v5 changes:
1. treat type-B connector as child device of USB controller's, but not
as a separate virtual device, suggested by Rob
2. put connector's port node under connector node, suggested by Rob
v4 no changes
v3 changes:
1. treat type-B connector as a virtual device, but not child device of
USB controller's
v2 changes:
1. new patch to make binding clear suggested by Hans
---
.../bindings/usb/typeb-conn-gpio.txt | 42 +++++++++++++++++++
1 file changed, 42 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
diff --git a/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
new file mode 100644
index 000000000000..20dd3499a348
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
@@ -0,0 +1,42 @@
+USB Type-B GPIO Connector
+
+This is used to switch dual role mode from the USB ID pin connected to
+an input GPIO pin.
+
+Required properties:
+- compatible : should include "linux,typeb-conn-gpio" and "usb-b-connector".
+- id-gpios, vbus-gpios : either one of them must be present, and both
+ can be present as well.
+- vbus-supply : can be present if needed when supports dual role mode or
+ host mode.
+ see connector/usb-connector.txt
+
+Sub-nodes:
+- port : should be present.
+ see graph.txt
+
+Example:
+
+&mtu3 {
+ status = "okay";
+
+ connector {
+ compatible = "linux,typeb-conn-gpio", "usb-b-connector";
+ label = "micro-USB";
+ type = "micro";
+ id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
+ vbus-supply = <&usb_p0_vbus>;
+
+ port {
+ bconn_ep: endpoint@0 {
+ remote-endpoint = <&usb_role_sw>;
+ };
+ };
+ };
+
+ port {
+ usb_role_sw: endpoint@0 {
+ remote-endpoint = <&bconn_ep>;
+ };
+ };
+};
--
2.21.0
