drivers: i2s: i2s_stm32_sai add support for stm32l4xx

STM32L4xx series shares several SAI & DMA configurations with
the other platforms. These changes aim to remove specific
DMA & SAI configurations which are not used by STM32L4xx

Signed-off-by: Mario Paja <mariopaja@hotmail.com>

Author: mariopaja

drivers/i2s/i2s_stm32_sai.c

@@ -282,11 +282,14 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 		return ret;
 	}
 
-#if defined(CONFIG_SOC_SERIES_STM32H7X)
+	hdma->Instance = STM32_DMA_GET_INSTANCE(stream->reg, stream->dma_channel);
+	hdma->Init.Request = dma_cfg.dma_slot;
+	hdma->Init.Mode = DMA_NORMAL;
+
+#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_SOC_SERIES_STM32L4X)
 	hdma->Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
 	hdma->Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
 	hdma->Init.Priority = DMA_PRIORITY_HIGH;
-	hdma->Init.FIFOMode = DMA_FIFOMODE_DISABLE;
 	hdma->Init.PeriphInc = DMA_PINC_DISABLE;
 	hdma->Init.MemInc = DMA_MINC_ENABLE;
 #else
@@ -299,14 +302,15 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 	hdma->Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0 | DMA_DEST_ALLOCATED_PORT0;
 	hdma->Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
 #endif
-	hdma->Instance = STM32_DMA_GET_INSTANCE(stream->reg, stream->dma_channel);
-	hdma->Init.Request = dma_cfg.dma_slot;
-	hdma->Init.Mode = DMA_NORMAL;
+
+#if defined(CONFIG_SOC_SERIES_STM32H7X)
+	hdma->Init.FIFOMode = DMA_FIFOMODE_DISABLE;
+#endif
 
 	if (stream->dma_cfg.channel_direction == (enum dma_channel_direction)MEMORY_TO_PERIPHERAL) {
 		hdma->Init.Direction = DMA_MEMORY_TO_PERIPH;
 
-#if !defined(CONFIG_SOC_SERIES_STM32H7X)
+#if !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_SOC_SERIES_STM32L4X)
 		hdma->Init.SrcInc = DMA_SINC_INCREMENTED;
 		hdma->Init.DestInc = DMA_DINC_FIXED;
 #endif
@@ -315,7 +319,7 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 	} else {
 		hdma->Init.Direction = DMA_PERIPH_TO_MEMORY;
 
-#if !defined(CONFIG_SOC_SERIES_STM32H7X)
+#if !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_SOC_SERIES_STM32L4X)
 		hdma->Init.SrcInc = DMA_SINC_FIXED;
 		hdma->Init.DestInc = DMA_DINC_INCREMENTED;
 #endif
@@ -334,7 +338,7 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 		LOG_ERR("HAL_DMA_ConfigChannelAttributes: <Failed>");
 		return -EIO;
 	}
-#elif !defined(CONFIG_SOC_SERIES_STM32H7X)
+#elif !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_SOC_SERIES_STM32L4X)
 	if (HAL_DMA_ConfigChannelAttributes(&dev_data->hdma, DMA_CHANNEL_NPRIV) != HAL_OK) {
 		LOG_ERR("HAL_DMA_ConfigChannelAttributes: <Failed>");
 		return -EIO;
@@ -449,21 +453,28 @@ static int i2s_stm32_sai_configure(const struct device *dev, enum i2s_dir dir,
 		return -EINVAL;
 	}
 
+	/* STM32L4xx not possible to control MCLK output from SAI configuration */
+#if !defined(CONFIG_SOC_SERIES_STM32L4X)
 	if (cfg->mclk_enable && stream->master) {
 		hsai->Init.MckOutput = SAI_MCK_OUTPUT_ENABLE;
 	} else {
 		hsai->Init.MckOutput = SAI_MCK_OUTPUT_DISABLE;
 	}
+#endif
 
 	if (cfg->mclk_div == (enum mclk_divider)MCLK_NO_DIV) {
 		hsai->Init.NoDivider = SAI_MASTERDIVIDER_DISABLED;
 	} else {
 		hsai->Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
+
+		/* MckOverSampling is not supported by all STM32L4xx MCUs */
+#if !defined(CONFIG_SOC_SERIES_STM32L4X)
 		if (cfg->mclk_div == (enum mclk_divider)MCLK_DIV_256) {
 			hsai->Init.MckOverSampling = SAI_MCK_OVERSAMPLING_DISABLE;
 		} else {
 			hsai->Init.MckOverSampling = SAI_MCK_OVERSAMPLING_ENABLE;
 		}
+#endif
 	}
 
 	/* AudioFrequency */
@@ -849,4 +860,4 @@ static DEVICE_API(i2s, i2s_stm32_driver_api) = {
 	K_MSGQ_DEFINE(queue_##index, sizeof(struct queue_item), CONFIG_I2S_STM32_SAI_BLOCK_COUNT,  \
 		      4);
 
-DT_INST_FOREACH_STATUS_OKAY(I2S_STM32_SAI_INIT)
+DT_INST_FOREACH_STATUS_OKAY(I2S_STM32_SAI_INIT)