This parameter should also be supported.
Signed-off-by: Simon Glass <s...@chromium.org>
---
doc/device-tree-bindings/spi/spi-bus.txt | 2 ++
drivers/spi/spi.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/doc/device-tree-bindings/spi/spi-bus.txt
b/doc/device-tree-bindings/spi/spi-bus.txt
index 800dafe..5c8720a 100644
--- a/doc/device-tree-bindings/spi/spi-bus.txt
+++ b/doc/device-tree-bindings/spi/spi-bus.txt
@@ -59,6 +59,8 @@ contain the following properties.
used for MOSI. Defaults to 1 if not present.
- spi-rx-bus-width - (optional) The bus width(number of data wires) that
used for MISO. Defaults to 1 if not present.
+- spi-half-duplex - (optional) Indicates that the SPI bus should wait for
+ a header byte before reading data from the slave.
Some SPI controllers and devices support Dual and Quad SPI transfer mode.
It allows data in SPI system transfered in 2 wires(DUAL) or 4 wires(QUAD).
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 7ddea9b..7d81fbd 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -53,6 +53,8 @@ struct spi_slave *spi_base_setup_slave_fdt(const void *blob,
int busnum,
mode |= SPI_CPHA;
if (fdtdec_get_bool(blob, node, "spi-cs-high"))
mode |= SPI_CS_HIGH;
+ if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
+ mode |= SPI_PREAMBLE;
return spi_setup_slave(busnum, cs, max_hz, mode);
}
#endif
--
2.0.0.526.g5318336
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