gpio: ad7768: Add AD7768 GPIO auxiliary driver

The AD7768 provides five GPIOs controlled through registers shared
with the parent IIO device. Register an auxiliary gpio-regmap driver
and use the par

gpio: ad7768: Add AD7768 GPIO auxiliary driver

The AD7768 provides five GPIOs controlled through registers shared
with the parent IIO device. Register an auxiliary gpio-regmap driver
and use the parent device for runtime PM.

The device has separate input-state and output-latch registers. Add a
reg_mask_xlate() callback that checks the line direction and reads the
programmed output latch for output lines while retaining input-state
reads for input lines.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Janani Sunil <janani.sunil@analog.com>
Link: https://patch.msgid.link/20260910-ad7768-gpio-v8-3-6aaaa15adeb3@analog.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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