drivers: adc: esp32: check reference at compile time

Check that the channels are configured with the reference
ADC_REF_INTERNAL when compiling the driver.

Signed-off-by: Colin Evrard <[email protected]>

Author: CEV-MIND

drivers/adc/adc_esp32.c

@@ -751,8 +751,14 @@ static DEVICE_API(adc, api_esp32_driver_api) = {
 
 #endif /* defined(CONFIG_ADC_ESP32_DMA) */
 
+#define ADC_ESP32_CHECK_CHANNEL_REF(chan)                                                          \
+	BUILD_ASSERT(DT_ENUM_HAS_VALUE(chan, zephyr_reference, adc_ref_internal),                  \
+		     "adc_esp32 only supports ADC_REF_INTERNAL as a reference");
+
 #define ESP32_ADC_INIT(inst)                                                                       \
                                                                                                    \
+	DT_INST_FOREACH_CHILD(inst, ADC_ESP32_CHECK_CHANNEL_REF)                                   \
+                                                                                                   \
 	static const struct adc_esp32_conf adc_esp32_conf_##inst = {                               \
 		.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(inst)),                             \
 		.clock_subsys = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(inst, offset),         \