mei: add ABI documentation for fw_status exported through sysfs

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-class-mei b/Documentation/ABI/testing/sysfs-class-mei
index 0ec8b8178c41305a4435b208646715c22b94154a..80d9888a8ece2673686ead1cda4504ce568a1051 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-mei
+++ b/Documentation/ABI/testing/sysfs-class-mei
@@ -14,3 +14,18 @@ Description:
                The /sys/class/mei/meiN directory is created for
                each probed mei device
 
+What:          /sys/class/mei/meiN/fw_status
+Date:          Nov 2014
+KernelVersion: 3.19
+Contact:       Tomas Winkler <tomas.winkler@intel.com>
+Description:   Display fw status registers content
+
+               The ME FW writes its status information into fw status
+               registers for BIOS and OS to monitor fw health.
+
+               The register contains running state, power management
+               state, error codes, and others. The way the registers
+               are decoded depends on PCH or SoC generation.
+               Also number of registers varies between 1 and 6
+               depending on generation.
+