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authorLinus Walleij <linus.walleij@linaro.org>2018-11-02 00:25:04 +0300
committerMark Brown <broonie@kernel.org>2018-11-07 19:15:49 +0300
commit5132b3d283710d196cd8af99b5585507e8b30709 (patch)
tree500502d0cf45af7a321790aa116e2871128ea216 /include/linux/spi
parent651022382c7f8da46cb4872a545ee1da6d097d2a (diff)
downloadlinux-5132b3d283710d196cd8af99b5585507e8b30709.tar.xz
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/linux/spi')
-rw-r--r--include/linux/spi/spi.h1
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;