[PATCH 2/2] spi: dual and quad support(device tree)

[wangyuhang]

fix one thing in patch:
commit id:f477b7fb13df2b843997559ff34e87d054ba6538

change property spi-tx-nbits and spi-rx-nbits to optional.
If User don't set spi-tx-nbits or spi-rx-nbits, spi device mode
should be regarded as SINGLE, not return an error.

Signed-off-by: wangyuhang <wangyuhang2014 at gmail.com>
---
 drivers/spi/spi.c |   68 +++++++++++++++++++++++++----------------------------
 1 file changed, 32 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 50f7fc3..46a55f0 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -872,46 +872,42 @@ static void of_register_spi_devices(struct spi_master *master)
 		/* Device DUAL/QUAD mode */
 		prop = of_get_property(nc, "spi-tx-nbits", &len);
 		if (!prop || len < sizeof(*prop)) {
-			dev_err(&master->dev, "%s has no 'spi-tx-nbits' property\n",
-				nc->full_name);
-			spi_dev_put(spi);
-			continue;
-		}
-		switch (be32_to_cpup(prop)) {
-		case SPI_NBITS_SINGLE:
-			break;
-		case SPI_NBITS_DUAL:
-			spi->mode |= SPI_TX_DUAL;
-			break;
-		case SPI_NBITS_QUAD:
-			spi->mode |= SPI_TX_QUAD;
-			break;
-		default:
-			dev_err(&master->dev, "spi-tx-nbits value is not supported\n");
-			spi_dev_put(spi);
-			continue;
+			/* set tx mode in SINGLE as default */
+		} else {
+			switch (be32_to_cpup(prop)) {
+			case SPI_NBITS_SINGLE:
+				break;
+			case SPI_NBITS_DUAL:
+				spi->mode |= SPI_TX_DUAL;
+				break;
+			case SPI_NBITS_QUAD:
+				spi->mode |= SPI_TX_QUAD;
+				break;
+			default:
+				dev_err(&master->dev,
+					"spi-tx-nbits value is not supported\n");
+				spi_dev_put(spi);
+				continue;
 		}
 
 		prop = of_get_property(nc, "spi-rx-nbits", &len);
 		if (!prop || len < sizeof(*prop)) {
-			dev_err(&master->dev, "%s has no 'spi-rx-nbits' property\n",
-				nc->full_name);
-			spi_dev_put(spi);
-			continue;
-		}
-		switch (be32_to_cpup(prop)) {
-		case SPI_NBITS_SINGLE:
-			break;
-		case SPI_NBITS_DUAL:
-			spi->mode |= SPI_RX_DUAL;
-			break;
-		case SPI_NBITS_QUAD:
-			spi->mode |= SPI_RX_QUAD;
-			break;
-		default:
-			dev_err(&master->dev, "spi-rx-nbits value is not supported\n");
-			spi_dev_put(spi);
-			continue;
+			/* set rx mode in SINGLE as default */
+		} else {
+			switch (be32_to_cpup(prop)) {
+			case SPI_NBITS_SINGLE:
+				break;
+			case SPI_NBITS_DUAL:
+				spi->mode |= SPI_RX_DUAL;
+				break;
+			case SPI_NBITS_QUAD:
+				spi->mode |= SPI_RX_QUAD;
+				break;
+			default:
+				dev_err(&master->dev,
+					"spi-rx-nbits value is not supported\n");
+				spi_dev_put(spi);
+				continue;
 		}
 
 		/* Device speed */
-- 
1.7.9.5