[PATCH] ASoC: fsl-asoc-card: defer probe when the CPU DAI device is not ready

fsl_asoc_card_probe() hard-fails with -EINVAL when the CPU DAI (SAI)
platform device is not found. Like the codec, the CPU DAI may just be
probed later than the machine driver; the order is not guaranteed and
varies across kernel versions, so a permanent -EINVAL leaves the card
unregistered with no analog playback or capture.

Defer probe instead, mirroring commit e396dec46c56 ("ASoC:
fsl-asoc-card: Defer probe when fail to find codec device").

Tested on i.MX8MP with an ALC5672 on SAI3: the card that failed to
register on v6.18 now comes up during boot.

Fixes: 708b4351f08c ("ASoC: fsl: Add Freescale Generic ASoC Sound Card with ASRC support")
Signed-off-by: LiangCheng Wang <[email protected]>
---
 sound/soc/fsl/fsl-asoc-card.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
index 709543308fe9e9dc508a791b7125e5f467182cee..eff46666c8add604d0edbf9537ee2d275813c1b7 100644
--- a/sound/soc/fsl/fsl-asoc-card.c
+++ b/sound/soc/fsl/fsl-asoc-card.c
@@ -728,8 +728,8 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 
 	cpu_pdev = of_find_device_by_node(cpu_np);
 	if (!cpu_pdev) {
-		dev_err(&pdev->dev, "failed to find CPU DAI device\n");
-		ret = -EINVAL;
+		ret = dev_err_probe(&pdev->dev, -EPROBE_DEFER,
+				    "failed to find CPU DAI device\n");
 		goto fail;
 	}
 

---
base-commit: a13c140cc289c0b7b3770bce5b3ad42ab35074aa
change-id: 20260805-fsl-asoc-defer-cpu-dai-9b54e87f5d03

Best regards,
-- 
LiangCheng Wang <[email protected]>