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spi: Support half-duplex mode in FDT decode 

This parameter should also be supported.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
This commit is contained in:
Simon Glass 2014-07-07 10:16:39 -06:00 committed by Jagannadha Sutradharudu Teki
parent a4e29db257
commit 22052c6236
2 changed files with 4 additions and 0 deletions
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2
doc/device-tree-bindings/spi/spi-bus.txt
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@ -59,6 +59,8 @@ contain the following properties.
used for MOSI. Defaults to 1 if not present. used for MOSI. Defaults to 1 if not present.
- spi-rx-bus-width - (optional) The bus width(number of data wires) that - spi-rx-bus-width - (optional) The bus width(number of data wires) that
used for MISO. Defaults to 1 if not present. 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. 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). It allows data in SPI system transfered in 2 wires(DUAL) or 4 wires(QUAD).

2
drivers/spi/spi.c
View File

@ -53,6 +53,8 @@ struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
mode |= SPI_CPHA; mode |= SPI_CPHA;
if (fdtdec_get_bool(blob, node, "spi-cs-high")) if (fdtdec_get_bool(blob, node, "spi-cs-high"))
mode |= 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); return spi_setup_slave(busnum, cs, max_hz, mode);
} }
#endif #endif