pinctrl: apple: Implement GPIO func check callback

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This function will check if the indicated function enumerator
i.e. the value set into bits 5 and 6 of the pin configuration
register, is zero and thus corresponds to the GPIO mode of the
pin.

This may be necessary to know since the pin controller is
flagged as "strict": once you set a pin *explicitly* to GPIO
mode using function 0, the core is unaware that this is
actually the GPIO mode, and clients may be denied to
retrieve the pin as a GPIO.

Currently none of the in-kernel device trees sets any pin to
GPIO mode, but this may happen any day.

Reviewed-by: Sven Peter <sven@kernel.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

...

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Linus Walleij 2026-01-12 11:20:32 +01:00

parent 7b9a9cafc4

commit 881238a852

1 changed files with 8 additions and 0 deletions

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drivers/pinctrl/pinctrl-apple-gpio.c

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