Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg

   1 What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
   2 Date:           Feb 2014
   3 Contact:        Li Jun <b47624@freescale.com>
   4 Description:
   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
  18 What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop
  19 Date:           Feb 2014
  20 Contact:        Li Jun <b47624@freescale.com>
  21 Description:
  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
  33 What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
  34 Date:           Feb 2014
  35 Contact:        Li Jun <b47624@freescale.com>
  36 Description:
  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
  48 What:           /sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err
  49 Date:           Feb 2014
  50 Contact:        Li Jun <b47624@freescale.com>
  51 Description:
  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"