1*4882a593SmuzhiyunWhat: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req 2*4882a593SmuzhiyunDate: Feb 2014 3*4882a593SmuzhiyunContact: Li Jun <jun.li@nxp.com> 4*4882a593SmuzhiyunDescription: 5*4882a593Smuzhiyun Can be set and read. 6*4882a593Smuzhiyun Set a_bus_req(A-device bus request) input to be 1 if 7*4882a593Smuzhiyun the application running on the A-device wants to use the bus, 8*4882a593Smuzhiyun and to be 0 when the application no longer wants to use 9*4882a593Smuzhiyun the bus(or wants to work as peripheral). a_bus_req can also 10*4882a593Smuzhiyun be set to 1 by kernel in response to remote wakeup signaling 11*4882a593Smuzhiyun from the B-device, the A-device should decide to resume the bus. 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun Valid values are "1" and "0". 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun Reading: returns 1 if the application running on the A-device 16*4882a593Smuzhiyun is using the bus as host role, otherwise 0. 17*4882a593Smuzhiyun 18*4882a593SmuzhiyunWhat: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop 19*4882a593SmuzhiyunDate: Feb 2014 20*4882a593SmuzhiyunContact: Li Jun <jun.li@nxp.com> 21*4882a593SmuzhiyunDescription: 22*4882a593Smuzhiyun Can be set and read 23*4882a593Smuzhiyun The a_bus_drop(A-device bus drop) input is 1 when the 24*4882a593Smuzhiyun application running on the A-device wants to power down 25*4882a593Smuzhiyun the bus, and is 0 otherwise, When a_bus_drop is 1, then 26*4882a593Smuzhiyun the a_bus_req shall be 0. 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun Valid values are "1" and "0". 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun Reading: returns 1 if the bus is off(vbus is turned off) by 31*4882a593Smuzhiyun A-device, otherwise 0. 32*4882a593Smuzhiyun 33*4882a593SmuzhiyunWhat: /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req 34*4882a593SmuzhiyunDate: Feb 2014 35*4882a593SmuzhiyunContact: Li Jun <jun.li@nxp.com> 36*4882a593SmuzhiyunDescription: 37*4882a593Smuzhiyun Can be set and read. 38*4882a593Smuzhiyun The b_bus_req(B-device bus request) input is 1 during the time 39*4882a593Smuzhiyun that the application running on the B-device wants to use the 40*4882a593Smuzhiyun bus as host, and is 0 when the application no longer wants to 41*4882a593Smuzhiyun work as host and decides to switch back to be peripheral. 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun Valid values are "1" and "0". 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun Reading: returns if the application running on the B device 46*4882a593Smuzhiyun is using the bus as host role, otherwise 0. 47*4882a593Smuzhiyun 48*4882a593SmuzhiyunWhat: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err 49*4882a593SmuzhiyunDate: Feb 2014 50*4882a593SmuzhiyunContact: Li Jun <jun.li@nxp.com> 51*4882a593SmuzhiyunDescription: 52*4882a593Smuzhiyun Only can be set. 53*4882a593Smuzhiyun The a_clr_err(A-device Vbus error clear) input is used to clear 54*4882a593Smuzhiyun vbus error, then A-device will power down the bus. 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun Valid value is "1" 57