phy: twl4030-usb: add ABI documentation

This driver device one local attribute: vbus.
Describe that in Documentation/ABI/testing/sysfs-platform/twl4030-usb.

Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
NeilBrown 2015-04-16 18:03:04 +10:00 committed by Kishon Vijay Abraham I
parent 4724e27114
commit 692fbb89fa

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What: /sys/bus/platform/devices/*twl4030-usb/vbus
Description:
Read-only status reporting if VBUS (approx 5V)
is being supplied by the USB bus.
Possible values: "on", "off".
Changes are notified via select/poll.