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| author | Thor Thayer <tthayer@opensource.altera.com> | 2016-10-10 09:25:24 -0500 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-10-21 12:09:30 +0100 |
| commit | 8eee6b9dd30d5b20a4c31886057a68bb6a2736c9 (patch) | |
| tree | 8d10e86d7f5575015b7316619369d75a70b831a6 /include/linux/spi/spi.h | |
| parent | 1001354ca34179f3db924eb66672442a173147dc (diff) | |
| download | linux-8eee6b9dd30d5b20a4c31886057a68bb6a2736c9.tar.gz linux-8eee6b9dd30d5b20a4c31886057a68bb6a2736c9.tar.bz2 linux-8eee6b9dd30d5b20a4c31886057a68bb6a2736c9.zip | |
spi: Add Flag to Enable Slave Select with GPIO Chip Select.
Some SPI masters require slave selection before the transfer
can begin [1]. The SPI framework currently selects the chip using
either 1) the internal CS mechanism or 2) the GPIO CS, but not both.
This patch adds a new master->flags define to indicate both the GPIO
CS and the internal chip select mechanism should be used.
Tested On:
Altera CycloneV development kit
Compile tested for build errors on x86_64 (allyesconfigs)
[1] DesignWare dw_apb_ssi Databook, Version 3.20a (page 39)
Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 4b743ac35396..75c6bd0ac605 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -442,6 +442,7 @@ struct spi_master { #define SPI_MASTER_NO_TX BIT(2) /* can't do buffer write */ #define SPI_MASTER_MUST_RX BIT(3) /* requires rx */ #define SPI_MASTER_MUST_TX BIT(4) /* requires tx */ +#define SPI_MASTER_GPIO_SS BIT(5) /* GPIO CS must select slave */ /* * on some hardware transfer / message size may be constrained |