[PATCH 1/1] thermal: fix compilation issue on CONFIG_THERMAL_OF dependencies

[Eduardo Valentin]

Users of API provided by THERMAL_OF config may suffer when
CONFIG_THERMAL=y, causing linking issues, such as:

drivers/built-in.o: In function `lm75_remove':
lm75.c:(.text+0x12bd8c): undefined reference to `thermal_zone_of_sensor_unregister'
drivers/built-in.o: In function `lm75_probe':
lm75.c:(.text+0x12c123): undefined reference to `thermal_zone_of_sensor_register'

Therefore, this patch limits the compilation build to always
have THERMAL=y, whenever THERMAL_OF=y. In this way, whenever
the API user is built, if THERMAL_OF=y, the build shall have
the full thermal support, otherwise, the thermal API will provide
stubs.

Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx>
---
 drivers/thermal/Kconfig | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 58f98bd..dc315e9 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -29,19 +29,6 @@ config THERMAL_HWMON
 	  Say 'Y' here if you want all thermal sensors to
 	  have hwmon sysfs interface too.
 
-config THERMAL_OF
-	bool
-	prompt "APIs to parse thermal data out of device tree"
-	depends on OF
-	default y
-	help
-	  This options provides helpers to add the support to
-	  read and parse thermal data definitions out of the
-	  device tree blob.
-
-	  Say 'Y' here if you need to build thermal infrastructure
-	  based on device tree.
-
 choice
 	prompt "Default Thermal governor"
 	default THERMAL_DEFAULT_GOV_STEP_WISE
@@ -235,3 +222,19 @@ source "drivers/thermal/samsung/Kconfig"
 endmenu
 
 endif
+
+menuconfig THERMAL_OF
+	bool
+	prompt "APIs to parse thermal data out of device tree"
+	depends on OF
+	select THERMAL
+	default y
+	help
+	  This options enables DT thermal API which adds support to
+	  read and parse thermal data definitions out of the
+	  device tree blob. This option is mostly used by embedded
+	  thermal drivers.
+
+	  Say 'Y' here if you need to build thermal infrastructure
+	  based on device tree.
+
-- 
1.8.2.1.342.gfa7285d

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