thermal: add available policies sysfs attribute

The Linux thermal framework support to change thermal governor
policy in userspace, but it can't show what available policies
supported.

This patch adds available_policies attribute to the thermal
framework, it can list the thermal governors which can be
used for a particular zone. This attribute is read only.

Signed-off-by: Wei Ni <wni@nvidia.com>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index c1f6864a8c5d..10f062ea6bc2 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -180,6 +180,7 @@ Thermal zone device sys I/F, created once it's registered:
     |---temp:                   Current temperature
     |---mode:                   Working mode of the thermal zone
     |---policy:                 Thermal governor used for this zone
+    |---available_policies:     Available thermal governors for this zone
     |---trip_point_[0-*]_temp:  Trip point temperature
     |---trip_point_[0-*]_type:  Trip point type
     |---trip_point_[0-*]_hyst:  Hysteresis value for this trip point
@@ -256,6 +257,10 @@ policy
         One of the various thermal governors used for a particular zone.
         RW, Required
 
+available_policies
+        Available thermal governors which can be used for a particular zone.
+        RO, Required
+
 trip_point_[0-*]_temp
         The temperature above which trip point will be fired.
         Unit: millidegree Celsius
@@ -417,6 +422,7 @@ method, the sys I/F structure will be built like this:
     |---temp:                   37000
     |---mode:                   enabled
     |---policy:                 step_wise
+    |---available_policies:     step_wise fair_share
     |---trip_point_0_temp:      100000
     |---trip_point_0_type:      critical
     |---trip_point_1_temp:      80000