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gpio: move ppc4xx gpio driver from arch/powerpc to drivers/gpio

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Move the ppc4xx gpio driver out of arch/powerpc/platforms/44x/ into
drivers/gpio/gpio-ppc44x.c. The driver has no architecture-specific
dependencies and follows the same pattern as other PowerPC GPIO
drivers already in drivers/gpio/ (e.g. gpio-mpc8xxx, gpio-mpc5200).

- Renamed Kconfig symbol from PPC4xx_GPIO to GPIO_PPC44X
- Updated ppc44x_defconfig and warp_defconfig to use the new symbol
- Marked the new option as tristate (was bool) since the driver
  supports module build via module_platform_driver()

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260803223539.86303-2-rosenp@gmail.com
This commit is contained in:
Rosen Penev 2026-08-03 15:35:32 -07:00 • committed by Madhavan Srinivasan
commit 66da1ae196
8 changed files with 222 additions and 221 deletions
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