linux-kernel - Re: [PATCH v6 5/9] mtk-mdp: make mdp driver to be loadable by platform_device

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Message-ID: <4d2e4210c74f7fe14d933571df768dc58a1e9266.camel@mediatek.com>
Date:   Mon, 16 Aug 2021 09:15:07 +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>,
        "Andrew-CT Chen (陳智迪)" 
        <Andrew-CT.Chen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Minghsiu Tsai (蔡明修)" 
        <Minghsiu.Tsai@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>, <houlong.wei@...iatek.com>
Subject: Re: [PATCH v6 5/9] mtk-mdp: make mdp driver to be loadable by
 platform_device_register*()

On Mon, 2021-08-02 at 20:12 +0800, Eizan Miyamoto wrote:
> Rather than hanging the MDP master component driver off of the rdma0
> device, make it possible too create a "virtual" device by registering
> it with platform_device_register_*() to be probed by the mtk_mdp_core
> driver.
> 
> Broadly, three interdependent things are done by this change:
> - Make it is possible to search for MDP devices in the device tree
>   through the grandparent device's of_node.
> - v4l-related setup is moved into from the mtk_mdp_core driver to the
>   mtk_mdp_comp driver.
> - Presence of a mediatek,vpu property in an MDP component device node
>   is used to determine what device to use when dispatching DMA ops
> from
>   the relevant ioctl, and also do V4L2 initialization in this case.
> 
> Signed-off-by: Eizan Miyamoto <eizan@...omium.org>
> ---

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

> Changes in v6:
> - Don't propagate errors from clock_on/off as an afterthought.
> - Split apart modifying mdp driver to be loadable from mmsys from
>   actually loading it from mmsys into two changs to make review
> easier.
> - Update devicetree bindings to reflect no longer needing the
>   mediatek,vpu property in the mdp_rdma0 device node.
> - Some stylistic cleanups.
> 
> Changes in v5:
> - rebase and test on 5.13-next @ e2f74b13dbe6
> 
> Changes in v4:
> - rebase and test on 5.13
> - don't depend on 
> https://patchwork.kernel.org/project/linux-mediatek/list/?series=464873
> 
> Changes in v3:
> - get mdp master from aliases instead of strcmp against of_node->name
> 
> Changes in v2:
> - rebased onto Linux 5.12
> - 100 char line length allowance was utilized in a few places
> - Removal of a redundant dev_err() print at the end of
>   mtk_mdp_comp_init()
> - Instead of printing errors and ignoring them, I've added a patch to
>   correctly propagate them.
> - Use of C style comments.
> - Three additional patches were added to eliminate dependency on the
>   mediatek,vpu property inside the mdp_rdma0 device node.

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