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Open Menu /Documentation/ABI/testing/sysfs-devices-lpss_ltr 
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What:		/sys/devices/.../lpss_ltr/
Date:		March 2013
Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Description:
		The /sys/devices/.../lpss_ltr/ directory is only present for
		devices included into the Intel Lynxpoint Low Power Subsystem
		(LPSS).  If present, it contains attributes containing the LTR
		mode and the values of LTR registers of the device.

What:		/sys/devices/.../lpss_ltr/ltr_mode
Date:		March 2013
Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Description:
		The /sys/devices/.../lpss_ltr/ltr_mode attribute contains an
		integer number (0 or 1) indicating whether or not the devices'
		LTR functionality is working in the software mode (1).

		This attribute is read-only.  If the device's runtime PM status
		is not "active", attempts to read from this attribute cause
		-EAGAIN to be returned.

What:		/sys/devices/.../lpss_ltr/auto_ltr
Date:		March 2013
Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Description:
		The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
		current value of the device's AUTO_LTR register (raw)
		represented as an 8-digit hexadecimal number.

		This attribute is read-only.  If the device's runtime PM status
		is not "active", attempts to read from this attribute cause
		-EAGAIN to be returned.

What:		/sys/devices/.../lpss_ltr/sw_ltr
Date:		March 2013
Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Description:
		The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
		current value of the device's SW_LTR register (raw) represented
		as an 8-digit hexadecimal number.

		This attribute is read-only.  If the device's runtime PM status
		is not "active", attempts to read from this attribute cause
		-EAGAIN to be returned.