linux-kernel - Re: [PATCH v3 0/3] Fix mdp device tree

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Date:   Mon, 22 May 2017 16:14:26 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        daniel.thompson@...aro.org, Rob Herring <robh+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Pawel Osciak <posciak@...omium.org>,
        Houlong Wei <houlong.wei@...iatek.com>
Cc:     srv_heupstream@...iatek.com,
        Eddie Huang <eddie.huang@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Wu-Cheng Li <wuchengli@...gle.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 0/3] Fix mdp device tree



On 22/05/17 11:09, Hans Verkuil wrote:
> On 05/12/2017 05:22 AM, Minghsiu Tsai wrote:
> 
> Who should take care of the dtsi changes? I'm not sure who maintains the mdp dts.

I will take care of the dtsi patches.

> 
> The driver change and the dtsi change need to be in sync, so it is probably easiest
> to merge this via one tree.
> 
> Here is my Acked-by for these three patches:
> 
> Acked-by: Hans Verkuil <hans.verkuil@...co.com>
> 
> I can take all three, provided I have the Ack of the mdp dts maintainer. Or it can
> go through him with my Ack.
> 

I think we should provide backwards compability instead, as proposed here:
http://lists.infradead.org/pipermail/linux-mediatek/2017-May/008811.html

If this change is ok for you, please let Minghsiu know so that he can 
provide a v4.

Regards,
Matthias

> Regards,
> 
> 	Hans
> 
>> Changes in v3:
>> - Upload patches again because forget to add v2 in title
>>
>> Changes in v2:
>> - Update commit message
>>
>> If the mdp_* nodes are under an mdp sub-node, their corresponding
>> platform device does not automatically get its iommu assigned properly.
>>
>> Fix this by moving the mdp component nodes up a level such that they are
>> siblings of mdp and all other SoC subsystems.  This also simplifies the
>> device tree.
>>
>> Although it fixes iommu assignment issue, it also break compatibility
>> with old device tree. So, the patch in driver is needed to iterate over
>> sibling mdp device nodes, not child ones, to keep driver work properly.
>>
>> Daniel Kurtz (2):
>>    arm64: dts: mt8173: Fix mdp device tree
>>    media: mtk-mdp: Fix mdp device tree
>>
>> Minghsiu Tsai (1):
>>    dt-bindings: mt8173: Fix mdp device tree
>>
>>   .../devicetree/bindings/media/mediatek-mdp.txt     |  12 +-
>>   arch/arm64/boot/dts/mediatek/mt8173.dtsi           | 126 ++++++++++-----------
>>   drivers/media/platform/mtk-mdp/mtk_mdp_core.c      |   2 +-
>>   3 files changed, 64 insertions(+), 76 deletions(-)
>>
>