linux-kernel - Re: Reusing DTS from arm64 to arm

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Date:   Tue, 24 Nov 2020 07:38:15 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Olof Johansson <olof@...om.net>, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: Reusing DTS from arm64 to arm

Hi Vinod,

On Tue, Nov 24 2020, Vinod Koul wrote:
> 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..?

You might want to take a look at Raspberry Pi. For example:

arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts:
// SPDX-License-Identifier: GPL-2.0
#include "arm/bcm2837-rpi-3-b.dts"

baruch

> 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
>
> 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


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