1*4882a593SmuzhiyunWhat: /sys/devices/.../lpss_ltr/ 2*4882a593SmuzhiyunDate: March 2013 3*4882a593SmuzhiyunContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 4*4882a593SmuzhiyunDescription: 5*4882a593Smuzhiyun The /sys/devices/.../lpss_ltr/ directory is only present for 6*4882a593Smuzhiyun devices included into the Intel Lynxpoint Low Power Subsystem 7*4882a593Smuzhiyun (LPSS). If present, it contains attributes containing the LTR 8*4882a593Smuzhiyun mode and the values of LTR registers of the device. 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunWhat: /sys/devices/.../lpss_ltr/ltr_mode 11*4882a593SmuzhiyunDate: March 2013 12*4882a593SmuzhiyunContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 13*4882a593SmuzhiyunDescription: 14*4882a593Smuzhiyun The /sys/devices/.../lpss_ltr/ltr_mode attribute contains an 15*4882a593Smuzhiyun integer number (0 or 1) indicating whether or not the devices' 16*4882a593Smuzhiyun LTR functionality is working in the software mode (1). 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun This attribute is read-only. If the device's runtime PM status 19*4882a593Smuzhiyun is not "active", attempts to read from this attribute cause 20*4882a593Smuzhiyun -EAGAIN to be returned. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunWhat: /sys/devices/.../lpss_ltr/auto_ltr 23*4882a593SmuzhiyunDate: March 2013 24*4882a593SmuzhiyunContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 25*4882a593SmuzhiyunDescription: 26*4882a593Smuzhiyun The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the 27*4882a593Smuzhiyun current value of the device's AUTO_LTR register (raw) 28*4882a593Smuzhiyun represented as an 8-digit hexadecimal number. 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun This attribute is read-only. If the device's runtime PM status 31*4882a593Smuzhiyun is not "active", attempts to read from this attribute cause 32*4882a593Smuzhiyun -EAGAIN to be returned. 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunWhat: /sys/devices/.../lpss_ltr/sw_ltr 35*4882a593SmuzhiyunDate: March 2013 36*4882a593SmuzhiyunContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 37*4882a593SmuzhiyunDescription: 38*4882a593Smuzhiyun The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the 39*4882a593Smuzhiyun current value of the device's SW_LTR register (raw) represented 40*4882a593Smuzhiyun as an 8-digit hexadecimal number. 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun This attribute is read-only. If the device's runtime PM status 43*4882a593Smuzhiyun is not "active", attempts to read from this attribute cause 44*4882a593Smuzhiyun -EAGAIN to be returned. 45