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Subject[PATCH -v3 4/4] PCI/PM: Add ABI document for sysfs file d3cold_allowed
This patch adds ABI document for the following sysfs file:


Signed-off-by: Huang Ying <>
Acked-by: Rafael J. Wysocki <>
Documentation/ABI/testing/sysfs-bus-pci | 12 ++++++++++++
1 file changed, 12 insertions(+)

--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -210,3 +210,15 @@ Users:
firmware assigned instance number of the PCI
device that can help in understanding the firmware
intended order of the PCI device.
+What: /sys/bus/pci/devices/.../d3cold_allowed
+Date: July 2012
+Contact: Huang Ying <>
+ d3cold_allowed is bit to control whether the corresponding PCI
+ device can be put into D3Cold state. If it is cleared, the
+ device will never be put into D3Cold state. If it is set, the
+ device may be put into D3Cold state if other requirements are
+ satisfied too. Reading this attribute will show the current
+ value of d3cold_allowed bit. Writing this attribute will set
+ the value of d3cold_allowed bit.

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