spi: gpio: Support 3WIRE high-impedance turn-around

Browse source

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>

...

This commit is contained in:

Linus Walleij 2018-11-01 22:25:04 +01:00 • committed by Mark Brown

parent 651022382c

commit 5132b3d283

No known key found for this signature in database

GPG key ID: 24D68B725D5487D0

2 changed files with 22 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

24

drivers/spi/spi-gpio.c

View file

1

include/linux/spi/spi.h

View file