iio: adc: sun4i: add THERMAL dependency

With CONFIG_THERMAL=m and CONFIG_SUN4I_GPADC=y, we get a link error
from calling devm_thermal_zone_of_sensor_register:

drivers/iio/built-in.o: In function `sun4i_gpadc_probe':
:(.text+0x1c284): undefined reference to `devm_thermal_zone_of_sensor_register'

This adds a Kconfig dependency to ensure we can only have the ADC
driver as built-in when this function is also built-in, or when
we see the empty stub implementation. When the thermal code is
a module, we can still build the adc driver as a module, too.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: d1caa99055382 ("iio: adc: add support for Allwinner SoCs ADC")
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 79b04693a5d154601b896a117eb567b2b6b86962..b7b3a9a80043762ae9305c6f39bd209e50c59656 100644 (file)
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -595,6 +595,7 @@ config SUN4I_GPADC
        tristate "Support for the Allwinner SoCs GPADC"
        depends on IIO
        depends on MFD_SUN4I_GPADC
+       depends on THERMAL || !THERMAL_OF
        help
          Say yes here to build support for Allwinner (A10, A13 and A31) SoCs
          GPADC. This ADC provides 4 channels which can be used as an ADC or as