[PATCH v2] remoteproc: mtk_scp: Only populate devices for SCP cores

[PATCH v2] remoteproc: mtk_scp: Only populate devices for SCP cores

[Chen-Yu Tsai]

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: 1fdbf0cdde98 ("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>
---
Changes since v1:
- Fix commit subject: populate devices *for* SCP cores
---
 drivers/remoteproc/mtk_scp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 0f4a7065d0bd..8206a1766481 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/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);
 }
 
-- 
2.47.0.338.g60cca15819-goog

Re: [PATCH v2] remoteproc: mtk_scp: Only populate devices for SCP cores

[Mathieu Poirier]

On Wed, Dec 11, 2024 at 03:20:07PM +0800, Chen-Yu Tsai wrote:
> 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: 1fdbf0cdde98 ("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>
> ---
> Changes since v1:
> - Fix commit subject: populate devices *for* SCP cores
> ---
>  drivers/remoteproc/mtk_scp.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>

I have applied this patch.

Thanks,
Mathieu

> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 0f4a7065d0bd..8206a1766481 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/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);
>  }
>  
> -- 
> 2.47.0.338.g60cca15819-goog
>