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

[Jude Gyimah <jude.gyimah87@gmail.com>]

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

  axg-spdifout.c:(.text+0x9c): 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_SPDIFOUT unselectable.

Reproduced on v7.3, arm64, with CONFIG_SND_MESON_AXG_SPDIFOUT=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: 53eb4b7aaa04 ("ASoC: meson: add axg spdif output")
Signed-off-by: Jude Gyimah <jude.gyimah87@gmail.com>
---
 sound/soc/meson/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index 10c7d59a5ad1..272639dd8eaf 100644
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -76,6 +76,7 @@ config SND_MESON_AXG_SOUND_CARD
 
 config SND_MESON_AXG_SPDIFOUT
 	tristate "Amlogic AXG SPDIF Output Support"
+	select REGMAP_MMIO
 	select SND_PCM_IEC958
 	imply SND_SOC_SPDIF
 	imply COMMON_CLK_AXG_AUDIO
-- 
2.43.0