drivers/disk: sdmmc stm32: Enable SDMMC Internal DMA on STM32L4plus mcu

STM32L4plus mcu has SDMMC internal DMA which works without any
configuration and it's handled by SDMMC HAL driver. This commit adds
option to enable it and use it.

Signed-off-by: Petr Hlineny <development@hlineny.cz>

drivers/disk/sdmmc_stm32.c

@@ -326,7 +326,7 @@ static int stm32_sdmmc_access_read(struct disk_info *disk, uint8_t *data_buf,
 
 	k_sem_take(&priv->thread_lock, K_FOREVER);
 
-#if STM32_SDMMC_USE_DMA
+#if STM32_SDMMC_USE_DMA || IS_ENABLED(DT_PROP(DT_DRV_INST(0), idma))
 	err = HAL_SD_ReadBlocks_DMA(&priv->hsd, data_buf, start_sector,
 				num_sector);
 #else
@@ -365,7 +365,7 @@ static int stm32_sdmmc_access_write(struct disk_info *disk,
 
 	k_sem_take(&priv->thread_lock, K_FOREVER);
 
-#if STM32_SDMMC_USE_DMA
+#if STM32_SDMMC_USE_DMA || IS_ENABLED(DT_PROP(DT_DRV_INST(0), idma))
 	err = HAL_SD_WriteBlocks_DMA(&priv->hsd, (uint8_t *)data_buf, start_sector,
 				 num_sector);
 #else

dts/arm/st/l4/stm32l4r5.dtsi

@@ -343,6 +343,7 @@
 				 <&rcc STM32_SRC_HSI48 CLK48_SEL(0)>;
 			resets = <&rctl STM32_RESET(AHB2, 22U)>;
 			interrupts = <49 0>;
+			idma;
 			status = "disabled";
 		};
 

dts/bindings/mmc/st,stm32-sdmmc.yaml

@@ -39,6 +39,13 @@ properties:
       - 4
       - 8
 
+  idma:
+    type: boolean
+    description: |
+      SDMMC device has an internal DMA. Internal DMA doesn't require any additional
+      configuration using "dmas" property.
+      Delete this property to use interrupt driven mode.
+
   dmas:
     description: |
       Optional DMA channel specifier. If DMA should be used, specifier should