commit 4b0f40c3ef8d68193895bc186f5ac48291b0a411
author Mugunthan V N <mugunthanvnm@ti.com> Wed Dec 23 20:39:37 2015 +0530
committer Jagan Teki <jteki@openedev.com> Wed Jan 13 18:47:27 2016 +0530
tree 30c622928294c0e369ad5cfd6de76dffe01214f0
parent cd467731139e91537bee99eff70f3421b42f1088

spi: Add support for dual and quad mode

spi bus can support dual and quad wire data transfers for tx and
rx. So defining dual and quad modes for both tx and rx. Also add
support to parse bus width used for spi tx and rx transfers.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>

drivers/spi/spi-uclass.c

diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index e0f6b25..677c020 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -157,6 +157,7 @@
 
 	slave->max_hz = plat->max_hz;
 	slave->mode = plat->mode;
+	slave->mode_rx = plat->mode_rx;
 
 	return 0;
 }
@@ -368,7 +369,8 @@
 int spi_slave_ofdata_to_platdata(const void *blob, int node,
 				 struct dm_spi_slave_platdata *plat)
 {
-	int mode = 0;
+	int mode = 0, mode_rx = 0;
+	int value;
 
 	plat->cs = fdtdec_get_int(blob, node, "reg", -1);
 	plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
@@ -382,8 +384,42 @@
 		mode |= SPI_3WIRE;
 	if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
 		mode |= SPI_PREAMBLE;
+
+	/* Device DUAL/QUAD mode */
+	value = fdtdec_get_uint(blob, node, "spi-tx-bus-width", 1);
+	switch (value) {
+	case 1:
+		break;
+	case 2:
+		mode |= SPI_TX_DUAL;
+		break;
+	case 4:
+		mode |= SPI_TX_QUAD;
+		break;
+	default:
+		error("spi-tx-bus-width %d not supported\n", value);
+		break;
+	}
+
 	plat->mode = mode;
 
+	value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
+	switch (value) {
+	case 1:
+		break;
+	case 2:
+		mode_rx |= SPI_RX_DUAL;
+		break;
+	case 4:
+		mode_rx |= SPI_RX_QUAD;
+		break;
+	default:
+		error("spi-rx-bus-width %d not supported\n", value);
+		break;
+	}
+
+	plat->mode_rx = mode_rx;
+
 	return 0;
 }
 

include/spi.h

diff --git a/include/spi.h b/include/spi.h
index 25470e4..4b88d39 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -61,11 +61,13 @@
  * @cs:		Chip select number (0..n-1)
  * @max_hz:	Maximum bus speed that this slave can tolerate
  * @mode:	SPI mode to use for this device (see SPI mode flags)
+ * @mode_rx:	SPI RX mode to use for this slave (see SPI mode_rx flags)
  */
 struct dm_spi_slave_platdata {
 	unsigned int cs;
 	uint max_hz;
 	uint mode;
+	u8 mode_rx;
 };
 
 #endif /* CONFIG_DM_SPI */