diff options
| author | Roger Quadros <rogerq@ti.com> | 2015-02-02 12:21:59 +0200 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2015-09-18 14:24:23 +0200 |
| commit | 0277928c1fa702411fdb75cad60f9f5856535e57 (patch) | |
| tree | 5ae2ca370f1bc2d464d5e5429f2c821cc055a727 /Documentation | |
| parent | 3772ffcf498ee917001c26256c306435afd00c04 (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>
(cherry picked from commit e52817faae359ce95c93c2b6eb88b16d4b430181)
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt | 18 |
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>; + }; |