[PATCH 2/4] ASoC: meson: axg-pdm: select REGMAP_MMIO

[Jude Gyimah]

Several stanzas in the same file already select REGMAP_MMIO,
SND_MESON_G12A_TOACODEC among them.  These three do not.

axg-pdm calls __devm_regmap_init_mmio_clk, which
drivers/base/regmap/regmap-mmio.c provides under REGMAP_MMIO.

  axg-pdm.c:(.text+0xc4): 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_MESON_AXG_PDM unselectable.

Reproduced on v7.3, arm64, with CONFIG_SND_MESON_AXG_PDM=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: 2cfc123eea74 ("ASoC: meson: add axg pdm input")
Signed-off-by: Jude Gyimah <jude.gyimah87@xxxxxxxxx>
---
 sound/soc/meson/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index d0f60f8af2b5..4b06a9e7c72a 100644
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -92,6 +92,7 @@ config SND_MESON_AXG_SPDIFIN
 
 config SND_MESON_AXG_PDM
 	tristate "Amlogic AXG PDM Input Support"
+	select REGMAP_MMIO
 	imply SND_SOC_DMIC
 	imply COMMON_CLK_AXG_AUDIO
 	help
-- 
2.43.0