diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2018-11-01 22:25:04 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-11-07 16:15:49 +0000 |
| commit | 5132b3d283710d196cd8af99b5585507e8b30709 (patch) | |
| tree | 500502d0cf45af7a321790aa116e2871128ea216 /include | |
| parent | 651022382c7f8da46cb4872a545ee1da6d097d2a (diff) | |
spi: gpio: Support 3WIRE high-impedance turn-around
Some devices such as the TPO TPG110 display panel require
a "high-impedance turn-around", in effect a clock cycle after
switching the line from output to input mode.
Support this in the GPIO driver to begin with. Other driver
may implement it if they can, it is unclear if this can
be achieved with anything else than GPIO bit-banging.
Cc: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include')
| -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 6be77fa5ab90..3ced58eebe1b 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -155,6 +155,7 @@ struct spi_device { #define SPI_RX_DUAL 0x400 /* receive with 2 wires */ #define SPI_RX_QUAD 0x800 /* receive with 4 wires */ #define SPI_CS_WORD 0x1000 /* toggle cs after each word */ +#define SPI_3WIRE_HIZ 0x2000 /* high impedance turnaround */ int irq; void *controller_state; void *controller_data; |