Documentation: ABI: usb: sysfs Description for chipidea USB OTG HNP and SRP

This patch adds sysfs interface description for chipidea USB OTG HNP and SRP.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg b/Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg
new file mode 100644
index 000000000000..151c59578db4
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+What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
+Date:           Feb 2014
+Contact:        Li Jun <b47624@freescale.com>
+Description:
+                Can be set and read.
+                Set a_bus_req(A-device bus request) input to be 1 if
+                the application running on the A-device wants to use the bus,
+                and to be 0 when the application no longer wants to use
+                the bus(or wants to work as peripheral). a_bus_req can also
+                be set to 1 by kernel in response to remote wakeup signaling
+                from the B-device, the A-device should decide to resume the bus.
+
+                Valid values are "1" and "0".
+
+                Reading: returns 1 if the application running on the A-device
+                is using the bus as host role, otherwise 0.
+
+What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop
+Date:           Feb 2014
+Contact:        Li Jun <b47624@freescale.com>
+Description:
+                Can be set and read
+                The a_bus_drop(A-device bus drop) input is 1 when the
+                application running on the A-device wants to power down
+                the bus, and is 0 otherwise, When a_bus_drop is 1, then
+                the a_bus_req shall be 0.
+
+                Valid values are "1" and "0".
+
+                Reading: returns 1 if the bus is off(vbus is turned off) by
+                         A-device, otherwise 0.
+
+What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
+Date:           Feb 2014
+Contact:        Li Jun <b47624@freescale.com>
+Description:
+                Can be set and read.
+                The b_bus_req(B-device bus request) input is 1 during the time
+                that the application running on the B-device wants to use the
+                bus as host, and is 0 when the application no longer wants to
+                work as host and decides to switch back to be peripheral.
+
+                Valid values are "1" and "0".
+
+                Reading: returns if the application running on the B device
+                is using the bus as host role, otherwise 0.
+
+What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err
+Date:           Feb 2014
+Contact:        Li Jun <b47624@freescale.com>
+Description:
+                Only can be set.
+                The a_clr_err(A-device Vbus error clear) input is used to clear
+                vbus error, then A-device will power down the bus.
+
+                Valid value is "1"