ASoC: imx-rpmsg: Support configure sysclk for codec dai

Some codecs need to configure the sysclk even with slave
mode, otherwise it may not work properly with some case.

wm8960 is the one that need sysclk be configured, so add
late_probe() to call the snd_soc_dai_set_sysclk() of codec
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1659495748-10876-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-rpmsg.c

@@ -19,6 +19,7 @@
 struct imx_rpmsg {
 	struct snd_soc_dai_link dai;
 	struct snd_soc_card card;
+	unsigned long sysclk;
 };
 
 static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
@@ -28,6 +29,27 @@ static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
 	SND_SOC_DAPM_MIC("Main MIC", NULL),
 };
 
+static int imx_rpmsg_late_probe(struct snd_soc_card *card)
+{
+	struct imx_rpmsg *data = snd_soc_card_get_drvdata(card);
+	struct snd_soc_pcm_runtime *rtd = list_first_entry(&card->rtd_list,
+							   struct snd_soc_pcm_runtime, list);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	struct device *dev = card->dev;
+	int ret;
+
+	if (!data->sysclk)
+		return 0;
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, 0, data->sysclk, SND_SOC_CLOCK_IN);
+	if (ret && ret != -ENOTSUPP) {
+		dev_err(dev, "failed to set sysclk in %s\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int imx_rpmsg_probe(struct platform_device *pdev)
 {
 	struct snd_soc_dai_link_component *dlc;
@@ -72,12 +94,18 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 		data->dai.codecs->dai_name = "snd-soc-dummy-dai";
 		data->dai.codecs->name = "snd-soc-dummy";
 	} else {
+		struct clk *clk;
+
 		data->dai.codecs->of_node = args.np;
 		ret = snd_soc_get_dai_name(&args, &data->dai.codecs->dai_name);
 		if (ret) {
 			dev_err(&pdev->dev, "Unable to get codec_dai_name\n");
 			goto fail;
 		}
+
+		clk = devm_get_clk_from_child(&pdev->dev, args.np, NULL);
+		if (!IS_ERR(clk))
+			data->sysclk = clk_get_rate(clk);
 	}
 
 	data->dai.cpus->dai_name = dev_name(&rpmsg_pdev->dev);
@@ -103,6 +131,7 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 	data->card.owner = THIS_MODULE;
 	data->card.dapm_widgets = imx_rpmsg_dapm_widgets;
 	data->card.num_dapm_widgets = ARRAY_SIZE(imx_rpmsg_dapm_widgets);
+	data->card.late_probe = imx_rpmsg_late_probe;
 	/*
 	 * Inoder to use common api to get card name and audio routing.
 	 * Use parent of_node for this device, revert it after finishing using