drivers: remove on-stack copying of dma cfg on stm32 drivers

This change removes the on-stack copying and instead
uses a pointer to the configuration to  avoid unnecessary
stack usage

Signed-off-by: Mario Paja <[email protected]>

Author: mariopaja

drivers/flash/flash_stm32_ospi.c

@@ -2242,7 +2242,7 @@ static int flash_stm32_ospi_init(const struct device *dev)
 	 * the minimum information to inform the DMA slot will be in used and
 	 * how to route callbacks.
 	 */
-	struct dma_config dma_cfg = dev_data->dma.cfg;
+	struct dma_config *dma_cfg = &dev_data->dma.cfg;
 	static DMA_HandleTypeDef hdma;
 
 	if (!device_is_ready(dev_data->dma.dev)) {

drivers/flash/flash_stm32_qspi.c

@@ -1558,7 +1558,7 @@ static int flash_stm32_qspi_init(const struct device *dev)
 	 * the minimum information to inform the DMA slot will be in used and
 	 * how to route callbacks.
 	 */
-	struct dma_config dma_cfg = dev_data->dma.cfg;
+	struct dma_config *dma_cfg = &dev_data->dma.cfg;
 	static DMA_HandleTypeDef hdma;
 
 	if (!device_is_ready(dev_data->dma.dev)) {

drivers/i2s/i2s_stm32_sai.c

@@ -279,7 +279,7 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 {
 	struct i2s_stm32_sai_data *dev_data = dev->data;
 	struct stream *stream = &dev_data->stream;
-	struct dma_config dma_cfg = dev_data->stream.dma_cfg;
+	struct dma_config *dma_cfg = &dev_data->stream.dma_cfg
 	int ret;
 
 	SAI_HandleTypeDef *hsai = &dev_data->hsai;

drivers/video/video_stm32_dcmi.c

@@ -147,7 +147,7 @@ static int stm32_dma_init(const struct device *dev)
 	 * the minimum information to inform the DMA slot will be in used and
 	 * how to route callbacks.
 	 */
-	struct dma_config dma_cfg = config->dma.cfg;
+	struct dma_config *dma_cfg = &config->dma.cfg;
 	static DMA_HandleTypeDef hdma;
 
 	/* Proceed to the minimum Zephyr DMA driver init */