drivers: adc: stm32: use correct macros for dma transfer

Use the correct dedicated macros for enabling DMA transfer for STM32H7 and
U5.

Signed-off-by: Guillaume Gautier <[email protected]>

drivers/adc/adc_stm32.c

@@ -221,12 +221,9 @@ static void adc_stm32_enable_dma_support(ADC_TypeDef *adc)
 
 #if defined(ADC_VER_V5_V90)
 	if (adc == ADC3) {
-		LL_ADC_REG_SetDMATransferMode(adc,
-			ADC3_CFGR_DMACONTREQ(LL_ADC_REG_DMA_TRANSFER_LIMITED));
-		LL_ADC_EnableDMAReq(adc);
+		LL_ADC_REG_SetDMATransferMode(adc, LL_ADC3_REG_DMA_TRANSFER_LIMITED);
 	} else {
-		LL_ADC_REG_SetDataTransferMode(adc,
-			ADC_CFGR_DMACONTREQ(LL_ADC_REG_DMA_TRANSFER_LIMITED));
+		LL_ADC_REG_SetDataTransferMode(adc, LL_ADC_REG_DMA_TRANSFER_LIMITED);
 	}
 #elif defined(ADC_VER_V5_X)
 	LL_ADC_REG_SetDataTransferMode(adc, LL_ADC_REG_DMA_TRANSFER_LIMITED);
@@ -238,7 +235,15 @@ static void adc_stm32_enable_dma_support(ADC_TypeDef *adc)
 
 #error "The STM32F1 ADC + DMA is not yet supported"
 
-#else /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_adc) */
+#elif defined(CONFIG_SOC_SERIES_STM32U5X) /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_adc) */
+
+	if (adc == ADC4) {
+		LL_ADC_REG_SetDMATransfer(adc, LL_ADC_REG_DMA_TRANSFER_LIMITED_ADC4);
+	} else {
+		LL_ADC_REG_SetDataTransferMode(adc, LL_ADC_REG_DMA_TRANSFER_LIMITED);
+	}
+
+#else /* defined(CONFIG_SOC_SERIES_STM32U5X) */
 
 	/* Default mechanism for other MCUs */
 	LL_ADC_REG_SetDMATransfer(adc, LL_ADC_REG_DMA_TRANSFER_LIMITED);