linux-kernel - Re: [PATCH 1/2] media: samsung: exynos4-is: drop simple-bus from compatibles

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Date:   Tue, 7 Feb 2023 21:15:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 1/2] media: samsung: exynos4-is: drop simple-bus from
 compatibles

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@...aro.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