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On some regmapped GPIOs apparently only a sparser selection of the lines (not all) are actually fixed direction. Support this situation by adding an optional bitmap indicating which GPIOs are actually fixed direction and which are not. Link: https://lore.kernel.org/linux-gpio/20260501155421.3329862-10-elder@riscstar.com/ Tested-by: Alex Elder <elder@riscstar.com> Signed-off-by: Linus Walleij <linusw@kernel.org> Reviewed-by: Michael Walle <mwalle@kernel.org> Reviewed-by: Alex Elder <elder@riscstar.com> Link: https://patch.msgid.link/20260511-regmap-gpio-sparse-fixed-dir-v3-1-1429ec453be7@kernel.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>