linux-kernel - Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <a9948c5e-4b12-fbf5-a096-fa7a64e3877b@gmail.com>
Date:   Sun, 26 Apr 2020 03:38:47 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, helen.koike@...labora.com
Cc:     sboyd@...nel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver

26.04.2020 03:24, Sowjanya Komatineni пишет:
> 
> On 4/25/20 5:19 PM, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 26.04.2020 02:44, Sowjanya Komatineni пишет:
>> ...
>>>> How much of the T210 code could be reused by T186/194?
>>> vi/csi are common driver where soc structure should be populated for
>>> T186/T194
>>>
>>> Tegra210.c can't be reused for Tegra186/t194 as programming seq is a
>>> whole lot diff
>>>
>> How are you going to separate Tegra210/186/194 drivers from each other?
>> I don't think you'll want to have one "fat" driver that covers all those
>> SoCs, won't you?
>>
>> In the end it should be three modules: tegra210-video.ko
>> tegra186-video.ko tegra194-video.ko.
>>
>> Using a per-SoC OPS doesn't allow you to do that because the "root"
>> driver will have to lookup OPS' code symbols of every SoC, and thus, the
>> unwanted driver modules will get auto-loaded if you'll try to factor out
>> the OPS into a separate driver modules.
> 
> tegra-video driver will be common for t210/186/194

Oh, well.

> we add corresponding compatibles to tegra-video and vi/csi drivers along
> with that need to add tegra186_vi_soc, tegra194_vi_soc and implement
> tegra186.c/tegra194.c
> 
> tegra-video driver updated for later tegra include updating drivers list
> and subdevs list to add t186/t194 compatibles