0001 What: /sys/devices/.../lpss_ltr/
0002 Date: March 2013
0003 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0004 Description:
0005 The /sys/devices/.../lpss_ltr/ directory is only present for
0006 devices included into the Intel Lynxpoint Low Power Subsystem
0007 (LPSS). If present, it contains attributes containing the LTR
0008 mode and the values of LTR registers of the device.
0009
0010 What: /sys/devices/.../lpss_ltr/ltr_mode
0011 Date: March 2013
0012 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0013 Description:
0014 The /sys/devices/.../lpss_ltr/ltr_mode attribute contains an
0015 integer number (0 or 1) indicating whether or not the devices'
0016 LTR functionality is working in the software mode (1).
0017
0018 This attribute is read-only. If the device's runtime PM status
0019 is not "active", attempts to read from this attribute cause
0020 -EAGAIN to be returned.
0021
0022 What: /sys/devices/.../lpss_ltr/auto_ltr
0023 Date: March 2013
0024 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0025 Description:
0026 The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
0027 current value of the device's AUTO_LTR register (raw)
0028 represented as an 8-digit hexadecimal number.
0029
0030 This attribute is read-only. If the device's runtime PM status
0031 is not "active", attempts to read from this attribute cause
0032 -EAGAIN to be returned.
0033
0034 What: /sys/devices/.../lpss_ltr/sw_ltr
0035 Date: March 2013
0036 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0037 Description:
0038 The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
0039 current value of the device's SW_LTR register (raw) represented
0040 as an 8-digit hexadecimal number.
0041
0042 This attribute is read-only. If the device's runtime PM status
0043 is not "active", attempts to read from this attribute cause
0044 -EAGAIN to be returned.
