[PATCH] ASoC: sam9g20ek: Disable capture unless building with microphone input

[Mark Brown]

Without modification the AT91SAM9G20-EK has no capture support, none of the
inputs of the CODEC are wired to anything to useful and there are no paths
supporting loopback. Since the audio is clocked from the CODEC and the DAPM
inputs are marked as unusable this means that capture will fail to transfer
any data as the ADC path can't be powered up.

Flag this in the device description so apps don't see unusable capture
support, guarded with the existing optional define for mic input.

Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/atmel/sam9g20_wm8731.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/atmel/sam9g20_wm8731.c b/sound/soc/atmel/sam9g20_wm8731.c
index 1430642c8433..785b9d01d8af 100644
--- a/sound/soc/atmel/sam9g20_wm8731.c
+++ b/sound/soc/atmel/sam9g20_wm8731.c
@@ -98,6 +98,9 @@ static struct snd_soc_dai_link at91sam9g20ek_dai = {
 	.init = at91sam9g20ek_wm8731_init,
 	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 		   SND_SOC_DAIFMT_CBP_CFP,
+#ifndef ENABLE_MIC_INPUT
+	.playback_only = true,
+#endif
 	SND_SOC_DAILINK_REG(pcm),
 };
 

---
base-commit: cac85e4616b1cf4a90844b952b49b9cbc4562530
change-id: 20230225-asoc-sam9g20ek-f4e775205d8c

Best regards,
-- 
Mark Brown <broonie at kernel.org>