tree b8eda5c5b308e7ce26eac18638456a40e4f2d648
parent 4c883abee08b13d7fac5e672159575bb7a3365a6
author Roger Quadros <rogerq@ti.com> 1422872519 +0200
committer Chanwoo Choi <cw00.choi@samsung.com> 1424736053 +0900

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>