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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-05-11 16:52:55 +0200 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2020-05-18 10:12:42 +0200 |
commit | 828546e24280f721350a7a0dcc92416e917b4382 (patch) | |
tree | 2251c9fdff92e74206304da216f35540444b76b9 /drivers/gpio/Makefile | |
parent | 4c033b549912bc301c5e2adfb7b6ca007c11bf31 (diff) | |
download | linux-828546e24280f721350a7a0dcc92416e917b4382.tar.gz |
gpio: Add GPIO Aggregator
GPIO controllers are exported to userspace using /dev/gpiochip* character devices. Access control to these devices is provided by standard UNIX file system permissions, on an all-or-nothing basis: either a GPIO controller is accessible for a user, or it is not. Currently no mechanism exists to control access to individual GPIOs. Hence add a GPIO driver to aggregate existing GPIOs, and expose them as a new gpiochip. This supports the following use cases: - Aggregating GPIOs using Sysfs This is useful for implementing access control, and assigning a set of GPIOs to a specific user or virtual machine. - Generic GPIO Driver This is useful for industrial control, where it can provide userspace access to a simple GPIO-operated device described in DT, cfr. e.g. spidev for SPI-operated devices. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com> Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com> Link: https://lore.kernel.org/r/20200511145257.22970-5-geert+renesas@glider.be Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/Makefile')
-rw-r--r-- | drivers/gpio/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index b2cfc21a97f3..65bf3940e33c 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o +obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o |