Re: [PATCH] [v2] i3c, iio: fix i3c driver dependencies

[Frank Li]

On Mon, Feb 02, 2026 at 05:04:46PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> 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 several times 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")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> v2: restore accidentally deleted lines
> ---
>  drivers/hwmon/Kconfig            |  6 ++----
>  drivers/i3c/Kconfig              | 12 ++++++++++++

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
>  drivers/iio/magnetometer/Kconfig |  2 +-
>  drivers/misc/amd-sbi/Kconfig     |  3 +--
>  4 files changed, 16 insertions(+), 7 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 2b81b22c9550..448fef4e5716 100644
> --- a/drivers/iio/magnetometer/Kconfig
> +++ b/drivers/iio/magnetometer/Kconfig
> @@ -143,7 +143,7 @@ config MMC5633
>  	tristate "MEMSIC MMC5633 3-axis magnetic sensor"
>  	select REGMAP_I2C if I2C
>  	select REGMAP_I3C if I3C
> -	depends on I2C || 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.
> --
> 2.39.5
>