dt-bindings: thermal: generic-adc: make lookup-table optional

Update binding description making lookup-table optional.

Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

diff --git a/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt b/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
index d723555..691a09d 100644 (file)
--- a/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
+++ b/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
@@ -8,16 +8,22 @@ temperature using voltage-temperature lookup table.
 Required properties:
 ===================
 - compatible:               Must be "generic-adc-thermal".
+- #thermal-sensor-cells:     Should be 1. See ./thermal.txt for a description
+                            of this property.
+Optional properties:
+===================
 - temperature-lookup-table:  Two dimensional array of Integer; lookup table
                             to map the relation between ADC value and
                             temperature. When ADC is read, the value is
                             looked up on the table to get the equivalent
                             temperature.
+
                             The first value of the each row of array is the
                             temperature in milliCelsius and second value of
                             the each row of array is the ADC read value.
-- #thermal-sensor-cells:     Should be 1. See ./thermal.txt for a description
-                            of this property.
+
+                            If not specified, driver assumes the ADC channel
+                            gives milliCelsius directly.
 
 Example :
 #include <dt-bindings/thermal/thermal.h>