Commit 4a5c9da4 authored by Linus Walleij's avatar Linus Walleij Committed by Bartosz Golaszewski

gpio: Mention GPIO MUX in docs

There is now a GPIO multiplexer, so mention this in the document
about drivers using GPIO as backend.
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
parent 81dd500b
......@@ -96,6 +96,12 @@ hardware descriptions such as device tree or ACPI:
way to pass the charging parameters from hardware descriptions such as the
device tree.
- gpio-mux: drivers/mux/gpio.c is used for controlling a multiplexer using
n GPIO lines such that you can mux in 2^n different devices by activating
different GPIO lines. Often the GPIOs are on a SoC and the devices are
some SoC-external entities, such as different components on a PCB that
can be selectively enabled.
Apart from this there are special GPIO drivers in subsystems like MMC/SD to
read card detect and write protect GPIO lines, and in the TTY serial subsystem
to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The
......
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