linux-kernel - Re: [RFC V2 5/5] arm64: dts: imx8mm-evk: Enable OV5640 Camera

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Date:   Fri, 5 Nov 2021 09:00:03 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Adam Ford <aford173@...il.com>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-media <linux-media@...r.kernel.org>,
        cstevens@...conembedded.com,
        Adam Ford-BE <aford@...conembedded.com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC V2 5/5] arm64: dts: imx8mm-evk: Enable OV5640 Camera

On Wed, Oct 27, 2021 at 6:34 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Adam,
>
> Thank you for the patch.
>
> On Sat, Oct 23, 2021 at 03:34:56PM -0500, Adam Ford wrote:
> > The schematic shows support for a camera interface, and the NXP
> > kernel shows it is an OV5640.
>
> The camera is an external module though. Should this be a DT overlay ?
>

Laurent,

I wanted to ask you about your comment here. I would agree that for
something like the OV5640 on the imx8mm-evk which is an add-in board
via a connector should be a dt overlay. I'm investigating using
overlays for features like this on my boards vs creating hierarchical
dts files and I see that the kernel allows building fragments with
'/plugin/' but I don't see any such overlays in the kernel tree
currently. Would overlay/fragments be accepted? Are there any examples
in the kernel tree already that I'm missing?

Best regards,

Tim