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| author |  Boerge Struempfel <boerge.struempfel@gmail.com>
| 2023-05-30 16:16:37 +0200 |
|---|---|---|
| committer |  Mark Brown <broonie@kernel.org>
| 2023-05-30 15:20:08 +0100 |
| commit | a45baa079e2a6b7a5516354c6ff08702232384f5 (patch) | |
| tree | a7e5c86a5032b656ea342004fd3483ef5457e7c3 /include/uapi/linux/spi | |
| parent | spi: Switch i2c drivers back to use .probe() (diff) | |
| download | linux-a45baa079e2a6b7a5516354c6ff08702232384f5.tar.gz linux-a45baa079e2a6b7a5516354c6ff08702232384f5.tar.bz2 linux-a45baa079e2a6b7a5516354c6ff08702232384f5.zip | |
spi: add SPI_MOSI_IDLE_LOW mode bit
Some spi controller switch the mosi line to high, whenever they are
idle. This may not be desired in all use cases. For example neopixel
leds can get confused and flicker due to misinterpreting the idle state.
Therefore, we introduce a new spi-mode bit, with which the idle behaviour
can be overwritten on a per device basis.
Signed-off-by: Boerge Struempfel <boerge.struempfel@gmail.com>
Link: https://lore.kernel.org/r/20230530141641.1155691-2-boerge.struempfel@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/uapi/linux/spi')
| -rw-r--r-- | include/uapi/linux/spi/spi.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/uapi/linux/spi/spi.h b/include/uapi/linux/spi/spi.h index 9d5f58059703..ca56e477d161 100644 --- a/include/uapi/linux/spi/spi.h +++ b/include/uapi/linux/spi/spi.h @@ -28,6 +28,7 @@ #define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */ #define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */ #define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */ +#define SPI_MOSI_IDLE_LOW _BITUL(17) /* leave mosi line low when idle */ /* * All the bits defined above should be covered by SPI_MODE_USER_MASK. @@ -37,6 +38,6 @@ * These bits must not overlap. A static assert check should make sure of that. * If adding extra bits, make sure to increase the bit index below as well. */ -#define SPI_MODE_USER_MASK (_BITUL(17) - 1) +#define SPI_MODE_USER_MASK (_BITUL(18) - 1) #endif /* _UAPI_SPI_H */ |