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>
git-mirror · Jun 1, 2015 · 692fbb8 · 692fbb8
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diff --git a/Documentation/ABI/testing/sysfs-platform-twl4030-usb b/Documentation/ABI/testing/sysfs-platform-twl4030-usb
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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.