xref: /linux/Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg (revision 4b4193256c8d3bc3a5397b5cd9494c2ad386317d)
1What:		/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
2Date:		Feb 2014
3Contact:	Li Jun <jun.li@nxp.com>
4Description:
5		Can be set and read.
6		Set a_bus_req(A-device bus request) input to be 1 if
7		the application running on the A-device wants to use the bus,
8		and to be 0 when the application no longer wants to use
9		the bus(or wants to work as peripheral). a_bus_req can also
10		be set to 1 by kernel in response to remote wakeup signaling
11		from the B-device, the A-device should decide to resume the bus.
12
13		Valid values are "1" and "0".
14
15		Reading: returns 1 if the application running on the A-device
16		is using the bus as host role, otherwise 0.
17
18What:		/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop
19Date:		Feb 2014
20Contact:	Li Jun <jun.li@nxp.com>
21Description:
22		Can be set and read
23		The a_bus_drop(A-device bus drop) input is 1 when the
24		application running on the A-device wants to power down
25		the bus, and is 0 otherwise, When a_bus_drop is 1, then
26		the a_bus_req shall be 0.
27
28		Valid values are "1" and "0".
29
30		Reading: returns 1 if the bus is off(vbus is turned off) by
31			 A-device, otherwise 0.
32
33What:		/sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
34Date:		Feb 2014
35Contact:	Li Jun <jun.li@nxp.com>
36Description:
37		Can be set and read.
38		The b_bus_req(B-device bus request) input is 1 during the time
39		that the application running on the B-device wants to use the
40		bus as host, and is 0 when the application no longer wants to
41		work as host and decides to switch back to be peripheral.
42
43		Valid values are "1" and "0".
44
45		Reading: returns if the application running on the B device
46		is using the bus as host role, otherwise 0.
47
48What:		/sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err
49Date:		Feb 2014
50Contact:	Li Jun <jun.li@nxp.com>
51Description:
52		Only can be set.
53		The a_clr_err(A-device Vbus error clear) input is used to clear
54		vbus error, then A-device will power down the bus.
55
56		Valid value is "1"
57