Documentation/ABI/testing/sysfs-devices-lpss_ltr

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-devices-lpss_ltr

File Facts

System: Linux kernel
Corpus path: Documentation/ABI/testing/sysfs-devices-lpss_ltr
Extension: [no extension]
Size: 1739 bytes
Lines: 45
Domain: Support Tooling And Documentation
Bucket: Documentation
Inferred role: Support Tooling And Documentation: Documentation
Status: atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

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.

Annotation

Atlas domain: Support Tooling And Documentation / Documentation.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.