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, and also used to enable/disable device when the USB Vbus
pin is connected to an input GPIO.
Signed-off-by: Chunfeng Yun
Reviewed-by: Linus Walleij
---
v11 changes:
1. add Reviewed-by Linus
2. change compatible as "gpio-usb-b-connector", and remove label
in example suggested by Rob
v9~v10 no changes
v8 changes:
1. rename the title
2. change the compatible as "linux,usb-conn-gpio" instead of
"linux,typeb-conn-gpio"
v7 changes:
1. add description for device only mode
v6 changes:
1. remove status and port nodes in example
2. make vbus-supply as optional property
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
---
.../devicetree/bindings/usb/usb-conn-gpio.txt | 30 +++
1 file changed, 30 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
diff --git a/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
new file mode 100644
index ..3d05ae56cb0d
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
@@ -0,0 +1,30 @@
+USB GPIO Based Connection Detection
+
+This is typically used to switch dual role mode from the USB ID pin connected
+to an input GPIO, and also used to enable/disable device mode from the USB
+Vbus pin connected to an input GPIO.
+
+Required properties:
+- compatible : should include "gpio-usb-b-connector" and "usb-b-connector".
+- id-gpios, vbus-gpios : input gpios, either one of them must be present,
+ and both can be present as well.
+ see connector/usb-connector.txt
+
+Optional properties:
+- vbus-supply : can be present if needed when supports dual role mode.
+ see connector/usb-connector.txt
+
+- Sub-nodes:
+ - port : can be present.
+ see graph.txt
+
+Example:
+
+ {
+ connector {
+ compatible = "gpio-usb-b-connector", "usb-b-connector";
+ type = "micro";
+ id-gpios = < 12 GPIO_ACTIVE_HIGH>;
+ vbus-supply = <_p0_vbus>;
+ };
+};
--
2.23.0
