linux-kernel - Re: [PATCH v6 6/9] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys

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Date:   Mon, 16 Aug 2021 09:18:16 +0800
From:   houlong wei <houlong.wei@...iatek.com>
To:     Eizan Miyamoto <eizan@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "wenst@...omium.org" <wenst@...omium.org>,
        Yong Wu (吴勇) 
        <Yong.Wu@...iatek.com>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>, <houlong.wei@...iatek.com>
Subject: Re: [PATCH v6 6/9] soc: mediatek: mmsys: instantiate mdp virtual
 device from mmsys

On Mon, 2021-08-02 at 20:12 +0800, Eizan Miyamoto wrote:
> A virtual device that is probed by the mtk_mdp_core driver is
> instantiated by the mtk_mmsys driver.
> 
> This better reflects the logical organization of the hardware and
> driver: there are a number of hardware blocks that are used by the
> MDP
> that have no strict hierarchy, and the software driver is responsible
> for driving them properly.
> 
> Signed-off-by: Eizan Miyamoto <eizan@...omium.org>
> ---

Reviewed-by: Houlong Wei <houlong.wei@...iatek.com>

> (no changes since v1)
> 
>  drivers/soc/mediatek/mtk-mmsys.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c
> b/drivers/soc/mediatek/mtk-mmsys.c
> index 080660ef11bf..e681029fe804 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -97,6 +97,7 @@ static int mtk_mmsys_probe(struct platform_device
> *pdev)
>  	struct platform_device *clks;
>  	struct platform_device *drm;
>  	struct mtk_mmsys *mmsys;
> +	struct platform_device *mdp;
>  	int ret;
>  
>  	mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
> @@ -122,10 +123,27 @@ static int mtk_mmsys_probe(struct
> platform_device *pdev)
>  					    PLATFORM_DEVID_AUTO, NULL,
> 0);
>  	if (IS_ERR(drm)) {
>  		platform_device_unregister(clks);
> -		return PTR_ERR(drm);
> +		ret = PTR_ERR(drm);
> +		goto err_drm;
> +	}
> +
> +	mdp = platform_device_register_data(&pdev->dev, "mtk-mdp",
> +					    PLATFORM_DEVID_AUTO, NULL,
> 0);
> +	if (IS_ERR(mdp)) {
> +		ret = PTR_ERR(mdp);
> +		dev_err(dev, "Failed to register mdp: %d\n", ret);
> +		goto err_mdp;
>  	}
>  
>  	return 0;
> +
> +err_mdp:
> +	platform_device_unregister(drm);
> +
> +err_drm:
> +	platform_device_unregister(clks);
> +
> +	return ret;
>  }
>  
>  static const struct of_device_id of_match_mtk_mmsys[] = {
> -- 
> 2.32.0.554.ge1b32706d8-goog
>