linux-kernel - Re: [PATCH RESEND] arm64: dts: qcom: apq8016-sbc-d3-camera: Convert to DT overlay

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Message-ID: <gbhlmjrkh2mavymxivli6c2wknlwlgt7nv3hch4yixufgmhldg@dp2vrwckqcoj>
Date: Tue, 8 Apr 2025 14:51:03 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephan Gerhold <stephan@...hold.net>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH RESEND] arm64: dts: qcom: apq8016-sbc-d3-camera: Convert
 to DT overlay

On Tue, Apr 08, 2025 at 01:38:42PM +0200, Stephan Gerhold wrote:
> From: Stephan Gerhold <stephan@...hold.net>
> 
> Follow the example of the recently added apq8016-sbc-usb-host.dtso and
> convert apq8016-sbc-d3-camera-mezzanine.dts to a DT overlay that can be
> applied on top of the apq8016-sbc.dtb. This makes it more clear that
> this is not a special type of DB410c but just an addon board that can
> be added on top.
> 
> Functionally there should not be any difference since
> apq8016-sbc-d3-camera-mezzanine.dtb is still generated as before
> (but now by applying the overlay on top of apq8016-sbc.dtb).
> 
> Since dtc does not know that there are default #address/size-cells in
> msm8916.dtsi, repeat those in the overlay to avoid dtc warnings because
> it expects the wrong amount of address/size-cells.
> 
> It would be nice to have a generic overlay for the D3 camera mezzanine
> (that can be applied to all 96Boards) but that's much more complicated
> than providing a board-specific DT overlay as intermediate step.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
> This patch was already applied by Bjorn on Sun, 28 Jan 2024 11:45:55 -0600
> as commit ea689ec32bf0d885277d3f58450a85df5149c98b [1]. However, unlike the
> first patch in the series, this one never made it into the repository for
> some reason.
> 
> [1]: https://lore.kernel.org/linux-arm-msm/170646395036.64610.14333204830178417809.b4-ty@kernel.org/
> ---
>  arch/arm64/boot/dts/qcom/Makefile                            |  5 +++--
>  ...ra-mezzanine.dts => apq8016-sbc-d3-camera-mezzanine.dtso} | 12 ++++++++++--
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

-- 
With best wishes
Dmitry