xref: /kernel/linux/linux-5.10/Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg

What:		/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
Date:		Feb 2014
Contact:	Li Jun <jun.li@nxp.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 <jun.li@nxp.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 <jun.li@nxp.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 <jun.li@nxp.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"