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From:   Chen-Yu Tsai <wens@kernel.org>
Date:   Tue, 24 Nov 2020 13:36:04 +0800
Message-ID: <CAGb2v67DpjMkcXoumQ=92wVovCqor37U7xroxsoh+BO6i7x8jg@mail.gmail.com>
Subject: Re: Reusing DTS from arm64 to arm
To:     Vinod Koul <vkoul@kernel.org>
Cc:     Olof Johansson <olof@lixom.net>, Rob Herring <robh+dt@kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
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Hi,

On Tue, Nov 24, 2020 at 1:28 PM Vinod Koul <vkoul@kernel.org> wrote:
>
> Hello Olof, Rob,
>
> We have Qualcomm arm platform which uses PMIC PM8150B. This PMIC was
> also used in SM8150 board and is already upstream [1] but in arm64.
>
> So, what is the guidance to share DTS files between 32 and 64 variants?
> Does a solution already exist which I may not be aware of..?
>
> I can think of following options for this, in case we dont have a
> solution:
>
> 1. Hack up arm include paths to also include arm64 path so that we can
> share DTS

These are already provided. See scripts/dtc/include-prefixes/ .

So just put

#include <arm64/qcom/pm8150b.dtsi>

in your DTS and it should work?

For Allwinner we have the reverse, i.e. including arm dts files from arm64.


Regards
ChenYu

> 2. Use relative path of arm64 directory and include that (seems not
> great to look at)
>
> 3. Copy the file (simplest but least preferred)
>
> Or is there a better idea to solve this...?
>
> [1]: arch/arm64/boot/dts/qcom/pm8150b.dtsi
>
> Thanks
> --
> ~Vinod
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