linux-kernel - Re: [resend, PATCH v2 1/1] x86/platform: Increase maximum GPIO number for X86

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Date:   Thu, 26 Aug 2021 18:51:05 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [resend, PATCH v2 1/1] x86/platform: Increase maximum GPIO number
 for X86_64

On Thu, Aug 26, 2021 at 5:03 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> By default the 512 GPIOs is the maximum on any x86 platform.
> With, for example, Intel Tiger Lake-H the SoC based controller
> occupies up to 480 pins. This leaves only 32 available for
> GPIO expanders or other drivers, like PMIC. Hence, bump the
> maximum GPIO number to 1024 for X86_64 and leave 512 for X86_32.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
> v2 resend: actually added Rafael and linux-acpi@ to Cc list
> v2: dropped confusing comment and help, simplified defaults (Rafael)
>     added Rb tag (Linus)
>  arch/x86/Kconfig | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 858ce2736bd6..25960fe242bd 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -338,6 +338,11 @@ config NEED_PER_CPU_PAGE_FIRST_CHUNK
>  config ARCH_HIBERNATION_POSSIBLE
>         def_bool y
>
> +config ARCH_NR_GPIO
> +       int
> +       default 1024 if X86_64
> +       default 512
> +
>  config ARCH_SUSPEND_POSSIBLE
>         def_bool y
>
> --
> 2.32.0
>