[PATCH 1/3] ASoC: fsl_aud2htx: select missing dependencies

[Jude Gyimah]

This driver is short two selects, not one: its configuration fails to
link on a symbol from each.

fsl_aud2htx calls __devm_regmap_init_mmio_clk, which
drivers/base/regmap/regmap-mmio.c provides under REGMAP_MMIO.
fsl_aud2htx calls devm_snd_dmaengine_pcm_register, which
sound/soc/soc-generic-dmaengine-pcm.c provides under
SND_SOC_GENERIC_DMAENGINE_PCM.

  fsl_aud2htx.c:(.text+0x30c): 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_SOC_FSL_AUD2HTX unselectable.

Reproduced on v7.3, x86_64, with CONFIG_SND_SOC_FSL_AUD2HTX=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: 8a24c834c053 ("ASoC: fsl_aud2htx: Add aud2htx module driver")
Signed-off-by: Jude Gyimah <jude.gyimah87@xxxxxxxxx>
---
 sound/soc/fsl/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 04940879dfd8..e8924ed652ba 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -116,6 +116,8 @@ config SND_SOC_FSL_XCVR
 config SND_SOC_FSL_AUD2HTX
 	tristate "AUDIO TO HDMI TX module support"
 	depends on ARCH_MXC || COMPILE_TEST
+	select REGMAP_MMIO
+	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select SND_SOC_IMX_PCM_DMA if SND_IMX_SOC != n
 	help
 	  Say Y if you want to add AUDIO TO HDMI TX support for NXP.
-- 
2.43.0