[PATCH v1 0/8] gpio: Get rid of ARCH_NR_GPIOS (v1)

[Andy Shevchenko]

On Mon, Aug 29, 2022 at 7:17 PM Christophe Leroy
<christophe.leroy at csgroup.eu> wrote:
>
> Since commit 14e85c0e69d5 ("gpio: remove gpio_descs global array")
> there is no limitation on the number of GPIOs that can be allocated
> in the system since the allocation is fully dynamic.
>
> ARCH_NR_GPIOS is today only used in order to provide downwards
> gpiobase allocation from that value, while static allocation is
> performed upwards from 0. However that has the disadvantage of
> limiting the number of GPIOs that can be registered in the system.
>
> To overcome this limitation without requiring each and every
> platform to provide its 'best-guess' maximum number, rework the
> allocation to allocate from 256 upwards, allowing approx 2 millions
> of GPIOs.
>
> In the meantime, add a warning for drivers how are still doing
> static allocation, so that in the future the static allocation gets
> removed completely and dynamic allocation can start at base 0.

For non-commented (by me or others) patches
Reviewed-by: Andy Shevchenko <andy.shevchenko!gmail.com>
For the patch 1 if you are going to address as suggested by the author
of the driver, you may also add my tag.

> Christophe Leroy (8):
>   gpio: aggregator: Stop using ARCH_NR_GPIOS
>   gpio: davinci: Stop using ARCH_NR_GPIOS
>   gpiolib: Warn on drivers still using static gpiobase allocation
>   gpiolib: Get rid of ARCH_NR_GPIOS
>   Documentation: gpio: Remove text about ARCH_NR_GPIOS
>   x86: Remove CONFIG_ARCH_NR_GPIO
>   arm: Remove CONFIG_ARCH_NR_GPIO
>   arm64: Remove CONFIG_ARCH_NR_GPIO
>
>  Documentation/driver-api/gpio/legacy.rst |  5 ---
>  arch/arm/Kconfig                         | 21 ---------
>  arch/arm/include/asm/gpio.h              |  1 -
>  arch/arm64/Kconfig                       | 12 ------
>  arch/x86/Kconfig                         |  5 ---
>  drivers/gpio/gpio-aggregator.c           |  8 ++--
>  drivers/gpio/gpio-davinci.c              |  3 --
>  drivers/gpio/gpio-sta2x11.c              |  5 +--
>  drivers/gpio/gpiolib.c                   | 13 +++---
>  include/asm-generic/gpio.h               | 55 +++++++++---------------
>  10 files changed, 36 insertions(+), 92 deletions(-)
>
> --
> 2.37.1
>


-- 
With Best Regards,
Andy Shevchenko