Documentation/ABI/testing/sysfs-amd-pmf: Add ABI doc for AMD PMF

AMD PMF driver provides the flexibility to turn "on" or "off"
CnQF feature (introduced in the earlier patch).

Add corresponding ABI documentation for the new sysfs node and
also update MAINTAINERS file with this new information

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20220922131202.56529-4-Shyam-sundar.S-k@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/Documentation/ABI/testing/sysfs-amd-pmf b/Documentation/ABI/testing/sysfs-amd-pmf
new file mode 100644 (file)
index 0000000..7fc0e1c
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-amd-pmf
@@ -0,0 +1,13 @@
+What:          /sys/devices/platform/*/cnqf_enable
+Date:          September 2022
+Contact:       Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+Description:   Reading this file tells if the AMD Platform Management(PMF)
+               Cool n Quiet Framework(CnQF) feature is enabled or not.
+
+               This feature is not enabled by default and gets only turned on
+               if OEM BIOS passes a "flag" to PMF ACPI function (index 11 or 12)
+               or in case the user writes "on".
+
+               To turn off CnQF user can write "off" to the sysfs node.
+               Note: Systems that support auto mode will not have this sysfs file
+               available.

diff --git a/MAINTAINERS b/MAINTAINERS
index 6bb894ea4a77bb2f1ec1a74232039cc7a841efbc..5a918c703b63933dd2343cb4a667e0ea2c1106ec 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1026,6 +1026,7 @@ AMD PMF DRIVER
 M:     Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
 L:     platform-driver-x86@vger.kernel.org
 S:     Maintained
+F:     Documentation/ABI/testing/sysfs-amd-pmf
 F:     drivers/platform/x86/amd/pmf/
 
 AMD HSMP DRIVER