linux-kernel - Re: [PATCH 0/2] arm64: dts: qcom: apq8016-sbc-d3-camera: Convert to DT overlay

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Message-ID: <c835c404-33f3-4f5b-8a8a-819d4019e74b@linaro.org>
Date:   Fri, 22 Sep 2023 21:47:07 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] arm64: dts: qcom: apq8016-sbc-d3-camera: Convert to
 DT overlay

On 22/09/2023 16:11, Stephan Gerhold wrote:
> 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.
> 
> I also prepended a patch that cleans up the node names a bit.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
> Stephan Gerhold (2):
>        arm64: dts: qcom: apq8016-sbc-d3-camera: Use more generic node names
>        arm64: dts: qcom: apq8016-sbc-d3-camera: Convert to DT overlay
> 
>   arch/arm64/boot/dts/qcom/Makefile                    |  5 +++--
>   ...nine.dts => apq8016-sbc-d3-camera-mezzanine.dtso} | 20 ++++++++++++++------
>   2 files changed, 17 insertions(+), 8 deletions(-)
> ---
> base-commit: 7236e86ce5c8198b01c30933c2334d07d877cf48
> change-id: 20230922-apq8016-sbc-camera-dtso-f247bea40f99
> 
> Best regards,

db410c doesn't ship with a bootloader that is capable of applying a dtbo 
though, so this conversion mandates an updated or chainloaded bootloader 
or out-of-tree kernel patch to support.

__adding__ is fine but, converting implies imposes a new requirement on 
the bootchain.

Perhaps a middle road solution is to

- Add, not convert a standalone dtbo or
- Add a dtbo that includes the mezzanine dts but amends it

Option 2 for preference but, I'm not sure the dts syntax can be 
meaningfully made to do that.

---
bod