Thermal: Introduce a step_wise thermal governor

This patch adds a simple step_wise governor to the
generic thermal layer. This algorithm throttles the
cooling devices in a linear fashion. If the 'trend'
is heating, it throttles by one step. And if the
thermal trend is cooling it de-throttles by one step.

This actually moves the throttling logic from thermal_sys.c
and puts inside step_wise.c, without any change.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 84b0f0382e5d..7e1b6de68566 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -61,3 +61,9 @@ config FAIR_SHARE
         depends on THERMAL
         help
           Enable this to manage platform thermals using fair-share governor.
+
+config STEP_WISE
+        bool "Step_wise thermal governor"
+        depends on THERMAL
+        help
+          Enable this to manage platform thermals using a simple linear