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| author | Simon Glass <sjg@chromium.org> | 2014-07-07 10:16:39 -0600 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-08-06 00:18:01 +0530 |
| commit | 22052c6236cbebc446ffd51ac69271fe063c654a (patch) | |
| tree | d1620dd86f989f4481a760fa4c41b684ba6896ab | |
| parent | a4e29db2571144a05ad09380b3674fe5b492f693 (diff) | |
| download | u-boot-imx-22052c6236cbebc446ffd51ac69271fe063c654a.zip u-boot-imx-22052c6236cbebc446ffd51ac69271fe063c654a.tar.gz u-boot-imx-22052c6236cbebc446ffd51ac69271fe063c654a.tar.bz2 | |
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>
| -rw-r--r-- | doc/device-tree-bindings/spi/spi-bus.txt | 2 | ||||
| -rw-r--r-- | drivers/spi/spi.c | 2 |
2 files changed, 4 insertions, 0 deletions
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 |