ASoC: fsl-asoc-card: Add optional dt property for setting mclk-id

Sound cards may allow using different main clock inputs. In the generic
fsl-asoc-card driver, these values are hardcoded for each specific card
configuration.

Let's make it more flexible, allowing setting mclk-id from the
device-tree node. Otherwise, the default value for each card
configuration is used.
Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>
Link: https://lore.kernel.org/r/20220117132109.283365-5-ariel.dalessandro@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl-asoc-card.c

@@ -693,6 +693,12 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 		goto asrc_fail;
 	}
 
+	/*
+	 * Allow setting mclk-id from the device-tree node. Otherwise, the
+	 * default value for each card configuration is used.
+	 */
+	of_property_read_u32(np, "mclk-id", &priv->codec_priv.mclk_id);
+
 	/* Format info from DT is optional. */
 	snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL, &bitclkprovider, &frameprovider);
 	if (bitclkprovider || frameprovider) {