1 What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req 2 Date: Feb 2014 3 Contact: Li Jun <jun.li@nxp.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 <jun.li@nxp.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 <jun.li@nxp.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 <jun.li@nxp.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"
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