[deliverable/linux.git] / Documentation / ABI / testing / sysfs-devices-sun

What:		/sys/devices/.../sun
Date:		October 2012
Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Description:
		The file contains a Slot-unique ID which provided by the _SUN
		method in the ACPI namespace. The value is written in Advanced
		Configuration and Power Interface Specification as follows:

		"The _SUN value is required to be unique among the slots of
		the same type. It is also recommended that this number match
		the slot number printed on the physical slot whenever possible."

		So reading the sysfs file, we can identify a physical position
		of the slot in the system.
Commit	Line	Data
89ca78a0	1	What: /sys/devices/.../sun
bb74ac23 YI	2	Date: October 2012
	3	Contact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
	4	Description:
	5	The file contains a Slot-unique ID which provided by the _SUN
	6	method in the ACPI namespace. The value is written in Advanced
	7	Configuration and Power Interface Specification as follows:
	8
	9	"The _SUN value is required to be unique among the slots of
	10	the same type. It is also recommended that this number match
	11	the slot number printed on the physical slot whenever possible."
	12
	13	So reading the sysfs file, we can identify a physical position
	14	of the slot in the system.