linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: msm8939-samsung-a7: Add initial dts

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Message-ID: <20230623104647.5501-1-linmengbo0689@protonmail.com>
Date:   Fri, 23 Jun 2023 10:47:05 +0000
From:   "Lin, Meng-Bo" <linmengbo0689@...tonmail.com>
To:     bryan.odonoghue@...aro.org
Cc:     agross@...nel.org, andersson@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, konrad.dybcio@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, linmengbo0689@...tonmail.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        nikita@...n.ru, robh+dt@...nel.org, stephan@...hold.net,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: msm8939-samsung-a7: Add initial dts

Hi Bryan,

On Friday, June 23rd, 2023 at 10:27 AM, Bryan O'Donoghue <bryan.odonoghue@...aro.org> wrote:

> > +++ b/arch/arm64/boot/dts/qcom/msm8939-samsung-a7.dts
> > @@ -0,0 +1,495 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +
> > +/dts-v1/;
> > +
> > +#include "msm8939-pm8916.dtsi"
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +#include <dt-bindings/input/input.h>
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +/ {
> > + model = "Samsung Galaxy A7 (2015)";
> > + compatible = "samsung,a7", "qcom,msm8939";
> > + chassis-type = "handset";
> 
> 
> Will the downstream bootloader accept this dts without
> 
> // This is used by the bootloader to find the correct DTB
> qcom,msm-id = <239 0>;
> 
> qcom,board-id = <0xEF08FF1 1>;
> 
> 
> ?
> 
> https://github.com/msm8916-mainline/lk2nd/blob/master/dts/msm8916/msm8939-samsung-r01.dts#L10
> 

Similar to A3 and A5, and the other msm8916 devices, with lk2nd,
"qcom,msm-id" or "qcom,board-id" are not required in mainline to boot
this dts.
If I understand correctly, lk2nd will attempt to boot an image with any
qcdt appended.

https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/msm8916-samsung-a3u-eur.dts
https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts

Regards,
Lin