drivers: adc: stm32 adc disable causing endless loop

Setting Oversampling also applies on stm32L5 but disabling
the ADC will cause endless loop except for the stm32L0 serie.
Errata applies only on stm32G0 soc series when
writing ADC_CFGR1 register.

Signed-off-by: Francois Ramu <[email protected]>

drivers/adc/adc_stm32.c

@@ -409,18 +409,10 @@ static int start_read(const struct device *dev,
 		return err;
 	}
 
-#if defined(CONFIG_SOC_SERIES_STM32G0X) || \
-	defined(CONFIG_SOC_SERIES_STM32G4X) || \
-	defined(CONFIG_SOC_SERIES_STM32H7X) || \
-	defined(CONFIG_SOC_SERIES_STM32L0X) || \
-	defined(CONFIG_SOC_SERIES_STM32L4X) || \
-	defined(CONFIG_SOC_SERIES_STM32L5X) || \
-	defined(CONFIG_SOC_SERIES_STM32WBX) || \
-	defined(CONFIG_SOC_SERIES_STM32WLX)
+#if defined(CONFIG_SOC_SERIES_STM32G0X)
 	/*
 	 * Errata: Writing ADC_CFGR1 register while ADEN bit is set
 	 * resets RES[1:0] bitfield. We need to disable and enable adc.
-	 * On all those stm32 devices it is allowed to write these bits only when ADEN = 0.
 	 */
 	if (LL_ADC_IsEnabled(adc) == 1UL) {
 		LL_ADC_Disable(adc);
@@ -436,6 +428,15 @@ static int start_read(const struct device *dev,
 	LL_ADC_SetResolution(adc, resolution);
 #endif
 
+#ifdef CONFIG_SOC_SERIES_STM32L0X
+	/*
+	 * setting OVS bits is conditioned to ADC state: ADC must be disabled
+	 * or enabled without conversion on going : disable it, it will stop
+	 */
+	LL_ADC_Disable(adc);
+	while (LL_ADC_IsEnabled(adc) == 1UL) {
+	}
+#endif /* CONFIG_SOC_SERIES_STM32L0X */
 #if defined(CONFIG_SOC_SERIES_STM32G0X) || \
 	defined(CONFIG_SOC_SERIES_STM32G4X) || \
 	defined(CONFIG_SOC_SERIES_STM32H7X) || \
@@ -444,13 +445,7 @@ static int start_read(const struct device *dev,
 	defined(CONFIG_SOC_SERIES_STM32L5X) || \
 	defined(CONFIG_SOC_SERIES_STM32WBX) || \
 	defined(CONFIG_SOC_SERIES_STM32WLX)
-	/*
-	 * setting OVS bits is conditioned to ADC state: ADC must be disabled
-	 * or enabled without conversion on going : disable it, it will stop
-	 */
-	LL_ADC_Disable(adc);
-	while (LL_ADC_IsEnabled(adc) == 1UL) {
-	}
+
 	switch (sequence->oversampling) {
 	case 0:
 		LL_ADC_SetOverSamplingScope(adc, LL_ADC_OVS_DISABLE);