[PATCH v3 1/4] spi: support spi without dma channel to use can_dma()

[Leilk Liu <leilk.liu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>]

For spi without dma channel and use can_dma(), it can
use master->dev for struct device.

Change-Id: I5b320e1742767c2ea4368410fb49c6679e28af6b
Signed-off-by: Leilk Liu <leilk.liu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
 drivers/spi/spi.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index cf8b91b..f725085 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -539,8 +539,15 @@ static int __spi_map_msg(struct spi_master *master, struct spi_message *msg)
 	if (!master->can_dma)
 		return 0;
 
-	tx_dev = master->dma_tx->device->dev;
-	rx_dev = master->dma_rx->device->dev;
+	if (master->dma_tx)
+		tx_dev = master->dma_tx->device->dev;
+	else
+		tx_dev = &master->dev;
+
+	if (master->dma_rx)
+		rx_dev = master->dma_rx->device->dev;
+	else
+		rx_dev = &master->dev;
 
 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 		if (!master->can_dma(master, msg->spi, xfer))
@@ -579,8 +586,15 @@ static int __spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
 	if (!master->cur_msg_mapped || !master->can_dma)
 		return 0;
 
-	tx_dev = master->dma_tx->device->dev;
-	rx_dev = master->dma_rx->device->dev;
+	if (master->dma_tx)
+		tx_dev = master->dma_tx->device->dev;
+	else
+		tx_dev = &master->dev;
+
+	if (master->dma_rx)
+		rx_dev = master->dma_rx->device->dev;
+	else
+		rx_dev = &master->dev;
 
 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 		if (!master->can_dma(master, msg->spi, xfer))
-- 
1.8.1.1.dirty

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