remoteproc: mtk_scp: Only populate devices for SCP cores

When multi-core SCP support was added, the driver was made to populate
platform devices for all the sub-nodes. This ended up adding platform
devices for the rpmsg sub-nodes as well, which never actually get used,
since rpmsg devices are registered through the rpmsg interface.

Limit of_platform_populate() to just populating the SCP cores with a
compatible string match list.

Fixes: 1fdbf0c ("remoteproc: mediatek: Probe SCP cluster on multi-core SCP")
Cc: Tinghan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20241211072009.120511-1-wenst@chromium.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: wens

drivers/remoteproc/mtk_scp.c

@@ -1326,6 +1326,11 @@ static int scp_cluster_init(struct platform_device *pdev, struct mtk_scp_of_clus
 	return ret;
 }
 
+static const struct of_device_id scp_core_match[] = {
+	{ .compatible = "mediatek,scp-core" },
+	{}
+};
+
 static int scp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1357,13 +1362,15 @@ static int scp_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&scp_cluster->mtk_scp_list);
 	mutex_init(&scp_cluster->cluster_lock);
 
-	ret = devm_of_platform_populate(dev);
+	ret = of_platform_populate(dev_of_node(dev), scp_core_match, NULL, dev);
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to populate platform devices\n");
 
 	ret = scp_cluster_init(pdev, scp_cluster);
-	if (ret)
+	if (ret) {
+		of_platform_depopulate(dev);
 		return ret;
+	}
 
 	return 0;
 }
@@ -1379,6 +1386,7 @@ static void scp_remove(struct platform_device *pdev)
 		rproc_del(scp->rproc);
 		scp_free(scp);
 	}
+	of_platform_depopulate(&pdev->dev);
 	mutex_destroy(&scp_cluster->cluster_lock);
 }