From 5132b3d283710d196cd8af99b5585507e8b30709 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 1 Nov 2018 22:25:04 +0100 Subject: 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 Acked-by: Lorenzo Bianconi Signed-off-by: Linus Walleij Signed-off-by: Mark Brown --- include/linux/spi/spi.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/spi') 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; -- cgit v1.2.3