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| author | Wolfgang Ocker <weo@reccoware.de> | 2008-10-15 15:00:47 +0200 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-10-21 06:34:01 +0200 |
| commit | f618ebfcbf9616a0fa9a78f5ecb69762f0fa3c59 (patch) | |
| tree | 89ac6262cce1610e61aa846ae305ea2c0c6323b2 | |
| parent | powerpc: Remove device_type = "board_control" properties in .dts files (diff) | |
| download | linux-f618ebfcbf9616a0fa9a78f5ecb69762f0fa3c59.tar.xz linux-f618ebfcbf9616a0fa9a78f5ecb69762f0fa3c59.zip | |
of/spi: Support specifying chip select as active high via device tree
The patch allows to specify that an SPI device needs an active high chip
select.
Signed-off-by: Wolfgang Ocker <weo@reccoware.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | Documentation/powerpc/booting-without-of.txt | 2 | ||||
| -rw-r--r-- | drivers/of/of_spi.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt index de4063cb4fdc..02ea9a971b8e 100644 --- a/Documentation/powerpc/booting-without-of.txt +++ b/Documentation/powerpc/booting-without-of.txt @@ -1917,6 +1917,8 @@ platforms are moved over to use the flattened-device-tree model. inverse clock polarity (CPOL) mode - spi-cpha - (optional) Empty property indicating device requires shifted clock phase (CPHA) mode + - spi-cs-high - (optional) Empty property indicating device requires + chip select active high SPI example for an MPC5200 SPI bus: spi@f00 { diff --git a/drivers/of/of_spi.c b/drivers/of/of_spi.c index b01eec026f68..bed0ed6dcdc1 100644 --- a/drivers/of/of_spi.c +++ b/drivers/of/of_spi.c @@ -61,6 +61,8 @@ void of_register_spi_devices(struct spi_master *master, struct device_node *np) spi->mode |= SPI_CPHA; if (of_find_property(nc, "spi-cpol", NULL)) spi->mode |= SPI_CPOL; + if (of_find_property(nc, "spi-cs-high", NULL)) + spi->mode |= SPI_CS_HIGH; /* Device speed */ prop = of_get_property(nc, "spi-max-frequency", &len); |