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

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Date:   Sat, 25 Apr 2020 17:24:28 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.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


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

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