of: thermal: Mark cooling-*-level properties optional

The cooling-{min,max}-level properties are marked as optional in
Documentation/devicetree/bindings/cpufreq/cpufreq-dt.txt and the usage
in various device tree matches this, i.e., some cooling device in the
device trees provide these properties while others do not.

Make the bindings in
Documentation/devicetree/bindings/thermal/thermal.txt consistent with
the cpufreq-dt bindings by marking the cooling-*-level properties as
optional.

Signed-off-by: Punit Agrawal <[email protected]>
Cc: Eduardo Valentin <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Kumar Gala <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt
index 8320186738ffdc5ed66dcc0a3b9246a5102902b6..41b817f7b6706515025b9a6e4af05304a62d5c25 100644 (file)
--- a/Documentation/devicetree/bindings/thermal/thermal.txt
+++ b/Documentation/devicetree/bindings/thermal/thermal.txt
@@ -60,14 +60,6 @@ properties) should be defined in a particular device's binding.
 For more examples of cooling devices, refer to the example sections below.
 
 Required properties:
-- cooling-min-level:   An integer indicating the smallest
-  Type: unsigned       cooling state accepted. Typically 0.
-  Size: one cell
-
-- cooling-max-level:   An integer indicating the largest
-  Type: unsigned       cooling state accepted.
-  Size: one cell
-
 - #cooling-cells:      Used to provide cooling device specific information
   Type: unsigned       while referring to it. Must be at least 2, in order
   Size: one cell       to specify minimum and maximum cooling state used
@@ -77,6 +69,15 @@ Required properties:
                        See Cooling device maps section below for more details
                        on how consumers refer to cooling devices.
 
+Optional properties:
+- cooling-min-level:   An integer indicating the smallest
+  Type: unsigned       cooling state accepted. Typically 0.
+  Size: one cell
+
+- cooling-max-level:   An integer indicating the largest
+  Type: unsigned       cooling state accepted.
+  Size: one cell
+
 * Trip points
 
 The trip node is a node to describe a point in the temperature domain