linux-kernel - Re: [PATCH 17/24] arm64: dts: qcom: glymur-crd: Avoid RTC probe failure

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Message-ID: <8f81289d-7672-42e6-b841-6514607cdb38@oss.qualcomm.com>
Date: Mon, 6 Oct 2025 16:28:59 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Kamal Wadhwa <kamal.wadhwa@....qualcomm.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc: Pankaj Patil <pankaj.patil@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/24] arm64: dts: qcom: glymur-crd: Avoid RTC probe
 failure

On 10/1/25 2:23 PM, Kamal Wadhwa wrote:
> Hi Krzysztof,
> 
> On Thu, Sep 25, 2025 at 1:41 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>>
>> On Thu, 25 Sept 2025 at 15:34, Pankaj Patil
>> <pankaj.patil@....qualcomm.com> wrote:
>>>
>>> From: Kamal Wadhwa <kamal.wadhwa@....qualcomm.com>
>>>
>>> On Glymur boards, the RTC alarm interrupts are routed to SOCCP
>>> subsystems and are not available to APPS. This can cause the
>>> RTC probe failure as the RTC IRQ registration will fail in
>>> probe.
>>>
>>> Fix this issue by adding `no-alarm` property in the RTC DT
>>> node. This will skip the RTC alarm irq registration and
>>> the RTC probe will return success.
>>
>>
>> This is ridiculous. You just added glymur CRD and you claim now that
>> it's broken and you need to fix it. So just fix that commit!
> 
> I'm afraid, but this is an actual limitation we have for Glymur
> (compared to Kaanapali).
> The RTC is part of the pmk8850.dtsi that is common between Kaanapali and
> Glymur. On Glymur (unlike Kaanapali) the APPS processor does *not* have the RTC
> IRQ permission for the RTC peripheral.

This is interesting.. is that a physical limitation, or some sort of
a software security policy?

Konrad