Mailing List Archive: [PATCH 1/2] media: samsung: exynos4-is: drop simple-bus from compatibles

The FIMC camera node wrapper is not a bus, so using simple-bus fallback
compatible just to instantiate its children nodes was never correct.
Driver should explicitly populate all its children devices.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
drivers/media/platform/samsung/exynos4-is/media-dev.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/samsung/exynos4-is/media-dev.c b/drivers/media/platform/samsung/exynos4-is/media-dev.c
index 98a60f01129d..70c4ca7844d3 100644
--- a/drivers/media/platform/samsung/exynos4-is/media-dev.c
+++ b/drivers/media/platform/samsung/exynos4-is/media-dev.c
@@ -1440,6 +1440,10 @@ static int fimc_md_probe(struct platform_device *pdev)
if (!fmd)
return -ENOMEM;

+ ret = devm_of_platform_populate(dev);
+ if (ret < 0)
+ return -ENOMEM;
+
spin_lock_init(&fmd->slock);
INIT_LIST_HEAD(&fmd->pipelines);
fmd->pdev = pdev;
--
2.34.1

On 07/02/2023 20:29, Krzysztof Kozlowski wrote:
> The FIMC camera node wrapper is not a bus, so using simple-bus fallback
> compatible just to instantiate its children nodes was never correct.
> Driver should explicitly populate all its children devices.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
> drivers/media/platform/samsung/exynos4-is/media-dev.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/samsung/exynos4-is/media-dev.c b/drivers/media/platform/samsung/exynos4-is/media-dev.c
> index 98a60f01129d..70c4ca7844d3 100644
> --- a/drivers/media/platform/samsung/exynos4-is/media-dev.c
> +++ b/drivers/media/platform/samsung/exynos4-is/media-dev.c
> @@ -1440,6 +1440,10 @@ static int fimc_md_probe(struct platform_device *pdev)
> if (!fmd)
> return -ENOMEM;
>
> + ret = devm_of_platform_populate(dev);
> + if (ret < 0)
> + return -ENOMEM;
> +

This cannot be devm-like, because on errors unpopulating devices breaks
links and IOMMU. I will make it of_platform_populate() instead.

Best regards,
Krzysztof