drivers/dma: dma_stm32f4x: use dma_slot to select peripheral

The DMA API provides dma_slot field as a method to configure at
runtime which peripheral DMA_request the DMA controller should
select.

This method allows to specify different selections for different stm32
DMA streams. So, all the Kconfig definitions, which by the way where
fixing the same selection for all DMA streams, have been deleted.

Signed-off-by: Armando Visconti <armando.visconti@st.com>

drivers/dma/Kconfig.stm32f4x

@@ -11,57 +11,3 @@ menuconfig DMA_STM32F4X
 	depends on SOC_SERIES_STM32F4X
 	help
 	  DMA driver for STM32F4x series SoCs.
-
-config DMA_0_RX_SUB_CHANNEL_ID
-	int "Requested RX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication from a peripheral/device.  Not required
-	  for memory to memory comms.
-
-config DMA_0_TX_SUB_CHANNEL_ID
-	int "Requested TX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication to a peripheral/device.  Not required
-	  for memory to memory comms.
-
-config DMA_1_RX_SUB_CHANNEL_ID
-	int "Requested RX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication from a peripheral/device.  Not required
-	  for memory to memory comms.
-
-config DMA_1_TX_SUB_CHANNEL_ID
-	int "Requested TX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication to a peripheral/device.  Not required
-	  for memory to memory comms.
-
-config DMA_2_RX_SUB_CHANNEL_ID
-	int "Requested RX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication from a peripheral/device.  Not required
-	  for memory to memory comms.
-
-config DMA_2_TX_SUB_CHANNEL_ID
-	int "Requested TX sub-channel ID"
-	default 0
-	depends on DMA_STM32F4X
-	help
-	  This configuration is required to choose a valid sub-channel
-	  for communication to a peripheral/device.  Not required
-	  for memory to memory comms.

drivers/dma/dma_stm32f4x.c

@@ -25,11 +25,6 @@
 
 #define DMA_STM32_IRQ_PRI	CONFIG_DMA_0_IRQ_PRI
 
-#define DMA_STM32_1_RX_CHANNEL_ID	CONFIG_DMA_1_RX_SUB_CHANNEL_ID
-#define DMA_STM32_1_TX_CHANNEL_ID	CONFIG_DMA_1_TX_SUB_CHANNEL_ID
-#define DMA_STM32_2_RX_CHANNEL_ID	CONFIG_DMA_2_RX_SUB_CHANNEL_ID
-#define DMA_STM32_2_TX_CHANNEL_ID	CONFIG_DMA_2_TX_SUB_CHANNEL_ID
-
 struct dma_stm32_stream_reg {
 	/* Shared registers */
 	u32_t lisr;
@@ -61,8 +56,6 @@ static struct dma_stm32_device {
 	struct device *clk;
 	struct dma_stm32_stream stream[DMA_STM32_MAX_STREAMS];
 	bool mem2mem;
-	u8_t channel_rx;
-	u8_t channel_tx;
 } device_data[DMA_STM32_MAX_DEVS];
 
 struct dma_stm32_config {
@@ -311,7 +304,7 @@ static int dma_stm32_config_devcpy(struct device *dev, u32_t id,
 			DMA_STM32_SCR_MSIZE(src_bus_width) |
 			DMA_STM32_SCR_PBURST(dst_burst_size) |
 			DMA_STM32_SCR_MBURST(src_burst_size) |
-			DMA_STM32_SCR_REQ(ddata->channel_tx) |
+			DMA_STM32_SCR_REQ(config->dma_slot) |
 			DMA_STM32_SCR_TCIE | DMA_STM32_SCR_TEIE |
 			DMA_STM32_SCR_MINC;
 		break;
@@ -321,7 +314,7 @@ static int dma_stm32_config_devcpy(struct device *dev, u32_t id,
 			DMA_STM32_SCR_MSIZE(dst_bus_width) |
 			DMA_STM32_SCR_PBURST(src_burst_size) |
 			DMA_STM32_SCR_MBURST(dst_burst_size) |
-			DMA_STM32_SCR_REQ(ddata->channel_rx) |
+			DMA_STM32_SCR_REQ(config->dma_slot) |
 			DMA_STM32_SCR_TCIE | DMA_STM32_SCR_TEIE |
 			DMA_STM32_SCR_MINC;
 		break;
@@ -548,8 +541,6 @@ static void dma_stm32_irq_7(void *arg) { dma_stm32_irq_handler(arg, 7); }
 static void dma_stm32_1_config(struct dma_stm32_device *ddata)
 {
 	ddata->base = DMA_STM32_1_BASE;
-	ddata->channel_tx = DMA_STM32_1_TX_CHANNEL_ID;
-	ddata->channel_rx = DMA_STM32_1_RX_CHANNEL_ID;
 
 	IRQ_CONNECT(DMA1_Stream0_IRQn, DMA_STM32_IRQ_PRI,
 		    dma_stm32_irq_0, DEVICE_GET(dma_stm32_1), 0);
@@ -588,8 +579,6 @@ static void dma_stm32_2_config(struct dma_stm32_device *ddata)
 {
 	ddata->base = DMA_STM32_2_BASE;
 	ddata->mem2mem = true;
-	ddata->channel_tx = DMA_STM32_2_TX_CHANNEL_ID;
-	ddata->channel_rx = DMA_STM32_2_RX_CHANNEL_ID;
 
 	IRQ_CONNECT(DMA2_Stream0_IRQn, DMA_STM32_IRQ_PRI,
 		    dma_stm32_irq_0, DEVICE_GET(dma_stm32_2), 0);