linux-kernel - Re: [PATCH v5 2/5] i2c: piix4: Depends on X86

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Message-ID: <CAMuHMdVPQLjOox5sMp34Z5MTwKv2WOpHa=MpZr8hWG22fQKcjw@mail.gmail.com>
Date: Tue, 10 Jun 2025 11:16:29 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Mario Limonciello <superm1@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>, Jean Delvare <jdelvare@...e.com>, Andi Shyti <andi.shyti@...nel.org>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Jonathan Corbet <corbet@....net>, Mario Limonciello <mario.limonciello@....com>, 
	Yazen Ghannam <yazen.ghannam@....com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, 
	Shyam Sundar S K <Shyam-sundar.S-k@....com>, Hans de Goede <hdegoede@...hat.com>, 
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, 
	"open list:I2C/SMBUS CONTROLLER DRIVERS FOR PC" <linux-i2c@...r.kernel.org>, 
	"open list:AMD PMC DRIVER" <platform-driver-x86@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, 
	linux-mips@...r.kernel.org, loongarch@...ts.linux.dev
Subject: Re: [PATCH v5 2/5] i2c: piix4: Depends on X86

Hi Mario,

CC mips, loongarch

On Wed, 23 Apr 2025 at 01:49, Mario Limonciello <superm1@...nel.org> wrote:
> From: Mario Limonciello <mario.limonciello@....com>
>
> PIIX4 and compatible controllers are only for X86. As some headers are
> being moved into x86 specific headers PIIX4 won't compile on non-x86.
>
> Suggested-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Thanks for your patch, which is now commit 7e173eb82ae97175
("i2c: piix4: Make CONFIG_I2C_PIIX4 dependent on CONFIG_X86")
in v6.16-rc1.

> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -200,7 +200,7 @@ config I2C_ISMT
>
>  config I2C_PIIX4
>         tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)"
> -       depends on PCI && HAS_IOPORT
> +       depends on PCI && HAS_IOPORT && X86

Are you sure this south-bridge is not used on non-x86 platforms?
It is enabled in several non-x86 defconfigs:

    arch/loongarch/configs/loongson3_defconfig:CONFIG_I2C_PIIX4=y
    arch/mips/configs/ip27_defconfig:CONFIG_I2C_PIIX4=m
    arch/mips/configs/loongson2k_defconfig:CONFIG_I2C_PIIX4=y
    arch/mips/configs/loongson3_defconfig:CONFIG_I2C_PIIX4=y

The loongarch and loongson entries are probably bogus, but I wouldn't
be surprised if the SGI Onyx and Origin do use Intel south-bridges.

>         select I2C_SMBUS
>         help
>           If you say yes to this option, support will be included for the Intel

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds