thermal: generic-adc: Add ADC based thermal sensor driver

In some of platform, thermal sensors like NCT thermistors are
connected to the one of ADC channel. The temperature is read by
reading the voltage across the sensor resistance via ADC. Lookup
table for ADC read value to temperature is referred to get
temperature. ADC is read via IIO framework.

Add support for thermal sensor driver which read the voltage across
sensor resistance from ADC through IIO framework.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index ee02e6021c94..4166c10ba314 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -411,4 +411,14 @@ config QCOM_SPMI_TEMP_ALARM
           real time die temperature if an ADC is present or an estimate of the
           temperature based upon the over temperature stage value.
 
+config GENERIC_ADC_THERMAL
+        tristate "Generic ADC based thermal sensor"
+        depends on IIO
+        help
+          This enabled a thermal sysfs driver for the temperature sensor
+          which is connected to the General Purpose ADC. The ADC channel
+          is read via IIO framework and the channel information is provided
+          to this driver. This driver reports the temperature by reading ADC
+          channel and converts it to temperature based on lookup table.
+
 endif