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| author | Mary Strodl <mstrodl@csh.rit.edu> | 2024-10-09 09:11:31 -0400 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-10-14 09:07:32 +0200 |
| commit | c46a74ff05c0ac76ba11ef21c930c3b447abf31a (patch) | |
| tree | 8df67dc1d35adcee12f79e6832995ef741617518 /drivers/gpio/Kconfig | |
| parent | b2e861bd1eaf4c5f75139df9b75dade3334a5b6c (diff) | |
| download | lwn-c46a74ff05c0ac76ba11ef21c930c3b447abf31a.tar.gz lwn-c46a74ff05c0ac76ba11ef21c930c3b447abf31a.zip | |
gpio: add support for FTDI's MPSSE as GPIO
FTDI FT2232H is a USB to GPIO chip. Sealevel produces some devices
with this chip. FT2232H presents itself as a composite device with two
interfaces (each is an "MPSSE"). Each MPSSE has two banks (high and low)
of 8 GPIO each. I believe some MPSSE's have only one bank, but I don't
know how to identify them (I don't have any for testing) and as a result
are unsupported for the time being.
Additionally, this driver provides software polling-based interrupts for
edge detection. For the Sealevel device I have to test with, this works
well because there is hardware debouncing. From talking to Sealevel's
people, this is their preferred way to do edge detection.
Signed-off-by: Mary Strodl <mstrodl@csh.rit.edu>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241009131131.1618329-1-mstrodl@csh.rit.edu
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index bfa6b5a2c537..3598d5094393 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1853,6 +1853,13 @@ config GPIO_VIPERBOARD River Tech's viperboard.h for detailed meaning of the module parameters. +config GPIO_MPSSE + tristate "FTDI MPSSE GPIO support" + select GPIOLIB_IRQCHIP + help + GPIO driver for FTDI's MPSSE interface. These can do input and + output. Each MPSSE provides 16 IO pins. + endmenu menu "Virtual GPIO drivers" |