spi_ll_stm32.diff

--- zephyr/drivers/spi/spi_ll_stm32.c	2022-05-16 14:34:57.051146688 +0200
+++ zephyr/drivers/spi/spi_ll_stm32.c	2022-05-16 14:33:08.026088060 +0200
@@ -204,18 +205,22 @@
 static int spi_dma_move_buffers(const struct device *dev, size_t len)
 {
 	struct spi_stm32_data *data = dev->data;
-	int ret;
+	int ret = 0;
 	size_t dma_segment_len;

-	dma_segment_len = len / data->dma_rx.dma_cfg.dest_data_size;
-	ret = spi_stm32_dma_rx_load(dev, data->ctx.rx_buf, dma_segment_len);
+ 	if (data->ctx.rx_buf != NULL) {
+ 		dma_segment_len = len / data->dma_rx.dma_cfg.dest_data_size;
+		ret = spi_stm32_dma_rx_load(dev, data->ctx.rx_buf, dma_segment_len);
+	}

 	if (ret != 0) {
 		return ret;
 	}

-	dma_segment_len = len / data->dma_tx.dma_cfg.source_data_size;
-	ret = spi_stm32_dma_tx_load(dev, data->ctx.tx_buf, dma_segment_len);
+ 	if (data->ctx.tx_buf != NULL) {
+		dma_segment_len = len / data->dma_tx.dma_cfg.source_data_size;
+		ret = spi_stm32_dma_tx_load(dev, data->ctx.tx_buf, dma_segment_len);
+	}

 	return ret;
 }
@@ -672,11 +677,17 @@

 static int wait_dma_rx_tx_done(const struct device *dev)
 {
+	const struct spi_stm32_config *cfg = dev->config;
 	struct spi_stm32_data *data = dev->data;
+	SPI_TypeDef *spi = cfg->spi;
 	int res = -1;

 	while (1) {
-		res = k_sem_take(&data->status_sem, K_MSEC(1000));
+		if (LL_SPI_GetMode(spi) == LL_SPI_MODE_MASTER) {
+    		res = k_sem_take(&data->status_sem, K_MSEC(1000));
+        } else {
+    		res = k_sem_take(&data->status_sem, K_FOREVER);
+        }
 		if (res != 0) {
 			return res;
 		}