linux-kernel - Re: [PATCH] i2c: i801: add I2C

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Message-ID: <qghidicjaxiygws4hfme7yfa5kfzg3y7tz4inqnjhwk67hjtwy@apfooo4pplq3>
Date: Sat, 6 Apr 2024 02:31:45 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>, 
	Guenter Roeck <linux@...ck-us.net>, Heiner Kallweit <hkallweit1@...il.com>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, Arnd Bergmann <arnd@...db.de>, 
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Jean Delvare <jdelvare@...e.de>, linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH] i2c: i801: add I2C_MUX dependency

Hi Arnd,

On Fri, Apr 05, 2024 at 04:27:43PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When I2C_MUX is a loadable module but I2C_I801 is built-in, the newly
> added notifier function causes a link error:
> 
> x86_64-linux-ld: drivers/i2c/busses/i2c-i801.o: in function `i801_notifier_call':
> i2c-i801.c:(.text+0x1f5): undefined reference to `i2c_root_adapter'
> 
> This code is only built if I2C_MUX_GPIO is also enabled, so add a
> conditional dependency that allows building the driver as before if the
> GPIO part is disabled, but otherwise require the linker dependency at
> Kconfig level.
> 
> With the added dependency, the driver cannot be selected by a builtin
> ITCO_WDT driver when I2C_MUX_GPIO is a loadable module, so remove
> the 'select' statement in that driver as well. This was apparently
> never needed at compile-time, and the watchdog driver just needs either
> the LPC or the I2C drivers, but never both.
> 
> Configurations that rely on the implied 'select' from the watchdog
> driver now need to enable all three.
> 
> Fixes: 71b494e043d2 ("i2c: i801: Call i2c_register_spd for muxed child segments")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

thanks for the proposed fix, but Heiner has already submitted a
fix for this issue. I'm going to mark this patch as superseeded,
if that's OK with you.

Thanks,
Andi