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authorRoger Quadros <rogerq@ti.com>2015-02-02 12:21:59 +0200
committerChanwoo Choi <cw00.choi@samsung.com>2015-02-24 09:00:53 +0900
commite52817faae359ce95c93c2b6eb88b16d4b430181 (patch)
treeb8eda5c5b308e7ce26eac18638456a40e4f2d648 /Documentation
parent4c883abee08b13d7fac5e672159575bb7a3365a6 (diff)
extcon: usb-gpio: Introduce gpio usb extcon driver
This driver observes the USB ID pin connected over a GPIO and updates the USB cable extcon states accordingly. The existing GPIO extcon driver is not suitable for this purpose as it needs to be taught to understand USB cable states and it can't handle more than one cable per instance. For the USB case we need to handle 2 cable states. 1) USB (attach/detach) 2) USB-HOST (attach/detach) This driver can be easily updated in the future to handle VBUS events in case it happens to be available on GPIO for any platform. Signed-off-by: Roger Quadros <rogerq@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Acked-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt b/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt
new file mode 100644
index 000000000000..af0b903de293
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt
@@ -0,0 +1,18 @@
+USB GPIO Extcon device
+
+This is a virtual device used to generate USB cable states from the USB ID pin
+connected to a GPIO pin.
+
+Required properties:
+- compatible: Should be "linux,extcon-usb-gpio"
+- id-gpio: gpio for USB ID pin. See gpio binding.
+
+Example: Examples of extcon-usb-gpio node in dra7-evm.dts as listed below:
+ extcon_usb1 {
+ compatible = "linux,extcon-usb-gpio";
+ id-gpio = <&gpio6 1 GPIO_ACTIVE_HIGH>;
+ }
+
+ &omap_dwc3_1 {
+ extcon = <&extcon_usb1>;
+ };