[PATCH] ASoC: sunxi: sun50i-dmic: select REGMAP_MMIO

[Jude Gyimah]

sun50i-dmic calls __devm_regmap_init_mmio_clk, which
drivers/base/regmap/regmap-mmio.c provides under REGMAP_MMIO.

  sun50i-dmic.c:(.text+0x142bce): undefined reference to
    `__devm_regmap_init_mmio_clk'

The driver can be built into vmlinux while REGMAP_MMIO is a module, in
which case the symbol is not there at link time.

Select rather than depend on: REGMAP_MMIO has no prompt of its own and is
only ever enabled by a select, so a depends on would leave SND_SUN50I_DMIC
unselectable.

Reproduced on v7.3, x86_64, with CONFIG_SND_SUN50I_DMIC=y and
CONFIG_REGMAP_MMIO=m.

Found with kreach, a static check that compares what Kconfig allows
against the symbols the compiled objects actually reference.

Fixes: 9fc2c8ed923d ("ASoC: sunxi: Add Allwinner H6 Digital MIC driver")
Signed-off-by: Jude Gyimah <jude.gyimah87@xxxxxxxxx>
---
The checker is at https://github.com/JGyimah/kreach, and the
reproducer configuration for each finding is published with it
under results/.

 sound/soc/sunxi/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/sunxi/Kconfig b/sound/soc/sunxi/Kconfig
index 205f422d9ded..c8a626396e9a 100644
--- a/sound/soc/sunxi/Kconfig
+++ b/sound/soc/sunxi/Kconfig
@@ -58,6 +58,7 @@ config SND_SUN4I_SPDIF
 
 config SND_SUN50I_DMIC
 	tristate "Allwinner H6 DMIC Support"
+	select REGMAP_MMIO
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help
 	  Say Y or M to add support for the DMIC audio block in the Allwinner
-- 
2.43.0