linux-kernel - Re: [PATCH] [v3, apply after -rc1] i3c: simplify combined i3c/i2c dependencies

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Message-ID: <b2fdaf5f-62b3-4695-aa89-b674aabefffb@roeck-us.net>
Date: Wed, 4 Feb 2026 10:15:56 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Arnd Bergmann <arnd@...nel.org>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Arnd Bergmann <arnd@...db.de>,
 Jonathan Cameron <jonathan.cameron@...wei.com>, linux-hwmon@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org,
 linux-iio@...r.kernel.org
Subject: Re: [PATCH] [v3, apply after -rc1] i3c: simplify combined i3c/i2c
 dependencies

On 2/4/26 08:41, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> All combined i2c/i3c drivers appear to suffer from the same link
> time problem when CONFIG_I3C is set to 'm':
> 
> arm-linux-gnueabi-ld: drivers/iio/magnetometer/mmc5633.o: in function `mmc5633_i3c_driver_init':
> mmc5633.c:(.init.text+0x30): undefined reference to `i3c_driver_register_with_owner'
> 
> This was previously fixed every time by marking individual
> drivers as 'depends on I2C; depends on I3C || !I3C', but this gets
> tedious and is somewhat confusing.
> 
> Add a Kconfig symbol 'I3C_OR_I2C' to help replace those dependencies,
> and use this in all the existing drivers that had already fixed it
> as well as the new mmc5633 driver.
> 
> Fixes: 6e5f6bf2e3f0 ("iio: magnetometer: Add mmc5633 sensor")
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

For hwmon:

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
> v2: restore accidentally deleted lines
> v3: rebase on top of Jonathan's IIO patch in linux-next
> ---
>   drivers/hwmon/Kconfig            |  6 ++----
>   drivers/i3c/Kconfig              | 12 ++++++++++++
>   drivers/iio/magnetometer/Kconfig |  3 +--
>   drivers/misc/amd-sbi/Kconfig     |  3 +--
>   4 files changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 41c381764c2b..ecfba861f66d 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1493,8 +1493,7 @@ config SENSORS_LM73
>   
>   config SENSORS_LM75
>   	tristate "National Semiconductor LM75 and compatibles"
> -	depends on I2C
> -	depends on I3C || !I3C
> +	depends on I3C_OR_I2C
>   	select REGMAP_I2C
>   	select REGMAP_I3C if I3C
>   	help
> @@ -2392,8 +2391,7 @@ config SENSORS_TMP103
>   
>   config SENSORS_TMP108
>   	tristate "Texas Instruments TMP108"
> -	depends on I2C
> -	depends on I3C || !I3C
> +	depends on I3C_OR_I2C
>   	select REGMAP_I2C
>   	select REGMAP_I3C if I3C
>   	help
> diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig
> index 30a441506f61..626c54b386d5 100644
> --- a/drivers/i3c/Kconfig
> +++ b/drivers/i3c/Kconfig
> @@ -22,3 +22,15 @@ menuconfig I3C
>   if I3C
>   source "drivers/i3c/master/Kconfig"
>   endif # I3C
> +
> +config I3C_OR_I2C
> +	tristate
> +	default m if I3C=m
> +	default I2C
> +	help
> +	  Device drivers using module_i3c_i2c_driver() can use either
> +	  i2c or i3c hosts, but cannot be built-in for the kernel when
> +	  CONFIG_I3C=m.
> +
> +	  Add 'depends on I2C_OR_I3C' in Kconfig for those drivers to
> +	  get the correct dependencies.
> diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig
> index 9345fb6d5317..fb313e591e85 100644
> --- a/drivers/iio/magnetometer/Kconfig
> +++ b/drivers/iio/magnetometer/Kconfig
> @@ -143,8 +143,7 @@ config MMC5633
>   	tristate "MEMSIC MMC5633 3-axis magnetic sensor"
>   	select REGMAP_I2C
>   	select REGMAP_I3C if I3C
> -	depends on I2C
> -	depends on I3C || !I3C
> +	depends on I3C_OR_I2C
>   	help
>   	  Say yes here to build support for the MEMSIC MMC5633 3-axis
>   	  magnetic sensor.
> diff --git a/drivers/misc/amd-sbi/Kconfig b/drivers/misc/amd-sbi/Kconfig
> index be022c71a90c..30e7fad7356c 100644
> --- a/drivers/misc/amd-sbi/Kconfig
> +++ b/drivers/misc/amd-sbi/Kconfig
> @@ -1,10 +1,9 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   config AMD_SBRMI_I2C
>   	tristate "AMD side band RMI support"
> -	depends on I2C
> +	depends on I3C_OR_I2C
>   	depends on ARM || ARM64 || COMPILE_TEST
>   	select REGMAP_I2C
> -	depends on I3C || !I3C
>   	select REGMAP_I3C if I3C
>   	help
>   	  Side band RMI over I2C/I3C support for AMD out of band management.