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gpio: raspberrypi-exp: explain Kconfig dependency

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Commit 7ed915059c (gpio: raspberrypi-ext: fix firmware dependency)
fixed the Kconfig dependency to ensure that gpio-raspberrypi-exp is not
built-in when the firmware is a module. But the Kconfig syntax for doing
so is cryptic. Add a comment to make it a little easier.

Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Baruch Siach <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Baruch Siach authored and Linus Walleij committed 2018-03-02 13:00:30 +01:00
1 parent 9a3821c2bb
commit 94337b7261
1 file changed
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drivers/gpio/Kconfig
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@@ -126,6 +126,8 @@ config GPIO_RASPBERRYPI_EXP
tristate "Raspberry Pi 3 GPIO Expander"
default RASPBERRYPI_FIRMWARE
depends on OF_GPIO
# Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
# happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
depends on (ARCH_BCM2835 && RASPBERRYPI_FIRMWARE) || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
help
Turn on GPIO support for the expander on Raspberry Pi 3 boards, using