Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / ABI / testing / sysfs-devices-sun

diff --git a/kernel/Documentation/ABI/testing/sysfs-devices-sun b/kernel/Documentation/ABI/testing/sysfs-devices-sun
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+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.