The SDCA modules failed to build with modpost errors:

  ERROR: modpost: "__devm_regmap_init_sdw" [sound/soc/sdca/snd-soc-sdca-class.ko] undefined!
  ERROR: modpost: "__devm_regmap_init_sdw_mbq" [sound/soc/sdca/snd-soc-sdca-class-function.ko] undefined!

The issue occurs because:
- sdca_class.c calls devm_regmap_init_sdw() which requires REGMAP_SOUNDWIRE
- sdca_class_function.c calls devm_regmap_init_sdw_mbq_cfg() which requires REGMAP_SOUNDWIRE_MBQ

However, the Kconfig didn't select these dependencies, causing the symbols
to be unavailable when the SDCA modules are built.

Fix this by adding:
- select REGMAP_SOUNDWIRE to SND_SOC_SDCA_CLASS
- select REGMAP_SOUNDWIRE_MBQ to SND_SOC_SDCA_CLASS_FUNCTION

This ensures the required regmap drivers are enabled when building SDCA support.

Configuration after fix:
  CONFIG_SND_SOC_SDCA_CLASS=m
  CONFIG_SND_SOC_SDCA_CLASS_FUNCTION=m
  CONFIG_REGMAP_SOUNDWIRE=m
  CONFIG_REGMAP_SOUNDWIRE_MBQ=m

Signed-off-by: Boris Faure <boris@fau.re>
---
 sound/soc/sdca/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/sdca/Kconfig b/sound/soc/sdca/Kconfig
index fabb69a3450d..87ab2895096c 100644
--- a/sound/soc/sdca/Kconfig
+++ b/sound/soc/sdca/Kconfig
@@ -46,12 +46,14 @@ config SND_SOC_SDCA_CLASS
 	select SND_SOC_SDCA_FDL
 	select SND_SOC_SDCA_HID
 	select SND_SOC_SDCA_IRQ
+	select REGMAP_SOUNDWIRE
 	help
 	  This option enables support for the SDCA Class driver which should
 	  support any class compliant SDCA part.
 
 config SND_SOC_SDCA_CLASS_FUNCTION
 	tristate
+	select REGMAP_SOUNDWIRE_MBQ
 	help
 	  This option enables support for the SDCA Class Function drivers,
 	  these implement the individual functions of the SDCA Class driver.
-- 
2.52.0

On Thu, 29 Jan 2026 14:14:54 +0000, Boris Faure wrote:
> The SDCA modules failed to build with modpost errors:
> 
>   ERROR: modpost: "__devm_regmap_init_sdw" [sound/soc/sdca/snd-soc-sdca-class.ko] undefined!
>   ERROR: modpost: "__devm_regmap_init_sdw_mbq" [sound/soc/sdca/snd-soc-sdca-class-function.ko] undefined!
> 
> The issue occurs because:
> - sdca_class.c calls devm_regmap_init_sdw() which requires REGMAP_SOUNDWIRE
> - sdca_class_function.c calls devm_regmap_init_sdw_mbq_cfg() which requires REGMAP_SOUNDWIRE_MBQ
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: sdca: Fix missing regmap dependencies in Kconfig
      commit: bbb758a6943e19c483ab752cf8220140b46cf22c

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

On Thu, Jan 29, 2026 at 02:14:54PM +0000, Boris Faure wrote:
> The SDCA modules failed to build with modpost errors:
> 
>   ERROR: modpost: "__devm_regmap_init_sdw" [sound/soc/sdca/snd-soc-sdca-class.ko] undefined!
>   ERROR: modpost: "__devm_regmap_init_sdw_mbq" [sound/soc/sdca/snd-soc-sdca-class-function.ko] undefined!
> 
> The issue occurs because:
> - sdca_class.c calls devm_regmap_init_sdw() which requires REGMAP_SOUNDWIRE
> - sdca_class_function.c calls devm_regmap_init_sdw_mbq_cfg() which requires REGMAP_SOUNDWIRE_MBQ
> 
> However, the Kconfig didn't select these dependencies, causing the symbols
> to be unavailable when the SDCA modules are built.
> 
> Fix this by adding:
> - select REGMAP_SOUNDWIRE to SND_SOC_SDCA_CLASS
> - select REGMAP_SOUNDWIRE_MBQ to SND_SOC_SDCA_CLASS_FUNCTION
> 
> This ensures the required regmap drivers are enabled when building SDCA support.
> 
> Configuration after fix:
>   CONFIG_SND_SOC_SDCA_CLASS=m
>   CONFIG_SND_SOC_SDCA_CLASS_FUNCTION=m
>   CONFIG_REGMAP_SOUNDWIRE=m
>   CONFIG_REGMAP_SOUNDWIRE_MBQ=m
> 
> Signed-off-by: Boris Faure <boris@fau.re>
> ---

Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Thanks,
Charles