[U-Boot] [PATCH v5 05/16] spi: Add support for dual and quad mode

[Mugunthan V N]

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 at ti.com>
---
 drivers/spi/spi-uclass.c | 31 +++++++++++++++++++++++++++++++
 include/spi.h            |  4 ++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index e0f6b25..e5df2c2 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -157,6 +157,7 @@ static int spi_child_pre_probe(struct udevice *dev)
 
 	slave->max_hz = plat->max_hz;
 	slave->mode = plat->mode;
+	slave->mode_rx = plat->mode_rx;
 
 	return 0;
 }
@@ -369,6 +370,7 @@ int spi_slave_ofdata_to_platdata(const void *blob, int node,
 				 struct dm_spi_slave_platdata *plat)
 {
 	int mode = 0;
+	int value;
 
 	plat->cs = fdtdec_get_int(blob, node, "reg", -1);
 	plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
@@ -382,6 +384,35 @@ int spi_slave_ofdata_to_platdata(const void *blob, int node,
 		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 4:
+		mode |= SPI_TX_QUAD;
+		break;
+	default:
+		error("spi-tx-bus-width %d not supported\n", value);
+		break;
+	}
+
+	value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
+	switch (value) {
+	case 1:
+		break;
+	case 2:
+		plat->mode_rx |= SPI_RX_DUAL;
+		break;
+	case 4:
+		plat->mode_rx |= SPI_RX_QUAD;
+		break;
+	default:
+		error("spi-rx-bus-width %d not supported\n", value);
+		break;
+	}
+
 	plat->mode = mode;
 
 	return 0;
diff --git a/include/spi.h b/include/spi.h
index 803fb40..94d8a32 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -38,11 +38,15 @@ struct dm_spi_bus {
  * @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 operation mode.
+ * @mode_tx:	SPI TX operation mode.
  */
 struct dm_spi_slave_platdata {
 	unsigned int cs;
 	uint max_hz;
 	uint mode;
+	u8 mode_rx;
+	u8 mode_tx;
 };
 
 #endif /* CONFIG_DM_SPI */
-- 
2.7.0.rc1.5.gf3adf45