[U-Boot] [PATCH v3 05/16] spi: Add support for dual and quad mode

Mugunthan V N
2015-11-19T07:05:34Z

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: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
drivers/spi/spi-uclass.c | 33 +++++++++++++++++++++++++++++++++
include/spi.h | 4 ++++
2 files changed, 37 insertions(+)

diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index 58388ef..62d8da7 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -349,6 +349,7 @@ 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);
@@ -360,6 +361,38 @@ int spi_slave_ofdata_to_platdata(const void *blob, int node,
mode |= SPI_CS_HIGH;
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;
+ }
+
+ value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1);
+ switch (value) {
+ case 1:
+ break;
+ case 2:
+ mode |= SPI_RX_DUAL;
+ break;
+ case 4:
+ mode |= 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 b4d2723..40dbb4d 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -23,6 +23,10 @@
#define SPI_LOOP 0x20 /* loopback mode */
#define SPI_SLAVE 0x40 /* slave mode */
#define SPI_PREAMBLE 0x80 /* Skip preamble bytes */
+#define SPI_TX_DUAL 0x100 /* transmit with 2 wires */
+#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
+#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
+#define SPI_RX_QUAD 0x800 /* receive with 4 wires */

/* SPI transfer flags */
#define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */
--
2.6.2.280.g74301d6