devicetree: add lm90 thermal_zone sensor support

This patch updates the LM90's devicetree definition to
include the #thermal-sensor-cells property as well as
the sensor constants in include/dt-bindings/thermal/lm90.h.

Cc: Wei Ni <wni@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/lm90.txt

@@ -33,6 +33,11 @@ Optional properties:
               LM90 "-ALERT" pin output.
               See interrupt-controller/interrupts.txt for the format.
 
+- #thermal-sensor-cells: should be set to 1. See thermal/thermal.txt for
+	      details. See <include/dt-bindings/thermal/lm90.h> for the
+	      definition of the local, remote and 2nd remote sensor index
+	      constants.
+
 Example LM90 node:
 
 temp-sensor {
@@ -41,4 +46,5 @@ temp-sensor {
 	vcc-supply = <&palmas_ldo6_reg>;
 	interrupt-parent = <&gpio>;
 	interrupts = <TEGRA_GPIO(O, 4) IRQ_TYPE_LEVEL_LOW>;
+	#thermal-sensor-cells = <1>;
 }

MAINTAINERS

@@ -7527,6 +7527,7 @@ S:	Maintained
 F:	Documentation/hwmon/lm90
 F:	Documentation/devicetree/bindings/hwmon/lm90.txt
 F:	drivers/hwmon/lm90.c
+F:	include/dt-bindings/thermal/lm90.h
 
 LM95234 HARDWARE MONITOR DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>

include/dt-bindings/thermal/lm90.h

@@ -0,0 +1,12 @@
+/*
+ * This header provides constants for the LM90 thermal bindings.
+ */
+
+#ifndef _DT_BINDINGS_THERMAL_LM90_H_
+#define _DT_BINDINGS_THERMAL_LM90_H_
+
+#define LM90_LOCAL_TEMPERATURE 0
+#define LM90_REMOTE_TEMPERATURE 1
+#define LM90_REMOTE2_TEMPERATURE 2
+
+#endif