ASoC: fsl_audmix: register card device depends on 'dais' property

In order to make the audmix device linked by audio graph card, make
'dais' property to be optional.

If 'dais' property exists, then register the imx-audmix card driver.
otherwise, it should be linked by audio graph card.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20250226100508.2352568-5-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_audmix.c

@@ -488,11 +488,17 @@ static int fsl_audmix_probe(struct platform_device *pdev)
 		goto err_disable_pm;
 	}
 
-	priv->pdev = platform_device_register_data(dev, "imx-audmix", 0, NULL, 0);
-	if (IS_ERR(priv->pdev)) {
-		ret = PTR_ERR(priv->pdev);
-		dev_err(dev, "failed to register platform: %d\n", ret);
-		goto err_disable_pm;
+	/*
+	 * If dais property exist, then register the imx-audmix card driver.
+	 * otherwise, it should be linked by audio graph card.
+	 */
+	if (of_find_property(pdev->dev.of_node, "dais", NULL)) {
+		priv->pdev = platform_device_register_data(dev, "imx-audmix", 0, NULL, 0);
+		if (IS_ERR(priv->pdev)) {
+			ret = PTR_ERR(priv->pdev);
+			dev_err(dev, "failed to register platform: %d\n", ret);
+			goto err_disable_pm;
+		}
 	}
 
 	return 0;