[PATCH v3 5/5] ASoC: fsl: imx-rpmsg: Update to correct DT node

[Chancel Liu <chancel.liu@xxxxxxx>]

In order to support register and unregister rpmsg sound card through
remoteproc platform device for card to probe is registered in
imx-audio-rpmsg. ASoC machine driver no longer can get DT node of ASoC
CPU DAI device through parent device.

ASoC machine driver can get DT node of ASoC CPU DAI device with rpmsg
channel name acquired from platform specific data.

Signed-off-by: Chancel Liu <chancel.liu@xxxxxxx>
---
 sound/soc/fsl/imx-rpmsg.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/sound/soc/fsl/imx-rpmsg.c b/sound/soc/fsl/imx-rpmsg.c
index e5bd63dab10c..0f1ad7ad7d27 100644
--- a/sound/soc/fsl/imx-rpmsg.c
+++ b/sound/soc/fsl/imx-rpmsg.c
@@ -108,10 +108,8 @@ static int imx_rpmsg_late_probe(struct snd_soc_card *card)
 static int imx_rpmsg_probe(struct platform_device *pdev)
 {
 	struct snd_soc_dai_link_component *dlc;
-	struct device *dev = pdev->dev.parent;
-	/* rpmsg_pdev is the platform device for the rpmsg node that probed us */
-	struct platform_device *rpmsg_pdev = to_platform_device(dev);
-	struct device_node *np = rpmsg_pdev->dev.of_node;
+	struct snd_soc_dai *cpu_dai;
+	struct device_node *np = NULL;
 	struct of_phandle_args args;
 	const char *platform_name;
 	struct imx_rpmsg *data;
@@ -127,10 +125,6 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
-	ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
-	if (ret)
-		dev_warn(&pdev->dev, "no reserved DMA memory\n");
-
 	data->dai.cpus = &dlc[0];
 	data->dai.num_cpus = 1;
 	data->dai.platforms = &dlc[1];
@@ -152,6 +146,23 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 	 */
 	data->dai.ignore_pmdown_time = 1;
 
+	data->dai.cpus->dai_name = pdev->dev.platform_data;
+	cpu_dai = snd_soc_find_dai(data->dai.cpus);
+	if (!cpu_dai) {
+		ret = -EPROBE_DEFER;
+		goto fail;
+	}
+	np = cpu_dai->dev->of_node;
+	if (!np) {
+		dev_err(&pdev->dev, "failed to parse CPU DAI device node\n");
+		ret = -ENODEV;
+		goto fail;
+	}
+
+	ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
+	if (ret)
+		dev_warn(&pdev->dev, "no reserved DMA memory\n");
+
 	/* Optional codec node */
 	ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
 	if (ret) {
@@ -170,7 +181,6 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 			data->sysclk = clk_get_rate(clk);
 	}
 
-	data->dai.cpus->dai_name = dev_name(&rpmsg_pdev->dev);
 	if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
 		data->dai.platforms->name = platform_name;
 	else
-- 
2.43.0