linux-kernel - Re: [PATCH v8 5/7] arm64: dts: qcom: Add initial support for MSM8937

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Message-ID: <6083a6b2-c5cc-41f0-8026-e022f2f4eb38@oss.qualcomm.com>
Date: Wed, 3 Sep 2025 12:54:38 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Barnabás Czémán <barnabas.czeman@...nlining.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Otto Pflüger <otto.pflueger@...cue.de>,
        Linus Walleij <linus.walleij@...aro.org>, Lee Jones <lee@...nel.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Dybcio <konradybcio@...nel.org>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Rob Clark
 <robin.clark@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Robert Marko <robimarko@...il.com>,
        Das Srinagesh <quic_gurus@...cinc.com>,
        Srinivas Kandagatla <srini@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, iommu@...ts.linux.dev,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux@...nlining.org, Dang Huynh <danct12@...eup.net>
Subject: Re: [PATCH v8 5/7] arm64: dts: qcom: Add initial support for MSM8937

On 9/3/25 12:47 PM, Barnabás Czémán wrote:
> 
> 
> On 3 September 2025 12:42:38 CEST, Konrad Dybcio <konrad.dybcio@....qualcomm.com> wrote:
>> On 8/31/25 2:29 PM, Barnabás Czémán wrote:
>>> From: Dang Huynh <danct12@...eup.net>
>>>
>>> Add initial support for MSM8937 SoC.
>>>
>>> Signed-off-by: Dang Huynh <danct12@...eup.net>
>>> Co-developed-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
>>> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
>>> ---
>>
>> [...]
>>
>>> +		qfprom: qfprom@...00 {
>>> +			compatible = "qcom,msm8937-qfprom", "qcom,qfprom";
>>> +			reg = <0x000a4000 0x1000>;
>>
>> here you reserve 0x1000 for the qfprom
>>
>> [...]
>>
>>> +			gpu_speed_bin: gpu-speed-bin@...b {
>>> +				reg = <0x601b 0x1>;
>>
>> and here you make way for OOB accesses
> Ack
>>
>> Make qfprom length 0x3000 with the current base and the gpu
>> speed bin should be at base+0x201b, I *think* (the docs aren't
>> super clear on that)
>>
>> [...]
>>
>>> +		mdss: display-subsystem@...0000 {
>>> +			compatible = "qcom,mdss";
>>> +			reg = <0x01a00000 0x1000>,
>>> +			      <0x01ab0000 0x1040>;
>>
>> In v5, I pointed out the size of vbif should be 0x3000.. and the random
> Where 0x3000 is come from downstream is using 0x1040 for vbif.

Hardware documentation.

Konrad