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

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Date:   Mon, 22 Nov 2021 01:18:35 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Tim Harvey <tharvey@...eworks.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

Hi Tim,

On Fri, Nov 05, 2021 at 09:00:03AM -0700, Tim Harvey wrote:
> On Wed, Oct 27, 2021 at 6:34 PM Laurent Pinchart 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?

I believe so (otherwise I'm not sure why the build system would allow
compiling overlays). Rob may have a more authoritative opinion on this
topic.

> Are there any examples
> in the kernel tree already that I'm missing?

Commit 7a4c31ee877a ("arm64: zynqmp: Add support for Xilinx Kria SOM
board") has been added recently.

-- 
Regards,

Laurent Pinchart