linux-kernel - Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: mpm: Pass MSG RAM slice through phandle

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Date:   Wed, 12 Apr 2023 14:09:33 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Cc:     Rob Herring <robh@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org,
        Shawn Guo <shawn.guo@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Marc Zyngier <maz@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: mpm: Pass MSG
 RAM slice through phandle



On 12.04.2023 13:55, Krzysztof Kozlowski wrote:
> On 12/04/2023 13:47, Konrad Dybcio wrote:
>>> For unrelated reasons I actually have some patches for this, that switch
>>> the /smd top-level node to a "remoteproc-like" node dedicated to the
>>> RPM, similar to how WCNSS/ADSP/Modem/etc are represented. I need this to
>>> add additional (optional) properties like "resets" and "iommus" for the
>>> RPM, but it would allow adding arbitrary subnodes as well:
>>>
>>> https://github.com/msm8916-mainline/linux/commit/35231ac28703805daa8220f1233847c7df34589e
>>>
>>> I could finish those up and post them if that would help...
>> Krzysztof, what do you think?
> 
> I don't know what is there in MSM8916 and how it should be represented.
Similarly to other Qualcomm SoCs, MSM8916 has a RPM (Cortex-M3) core,
which communicates over the SMD protocol (or G-LINK on >=8996).

The Qualcomm firmware loads the RPM fw blob and sets it up early in
the boot process, but msm8916-mainline folks managed to get TF-A
going and due to it being less.. invasive.. than the Qualcomm TZ,
RPM needs a bit more handling to be accessible.

The M3 core is wired up through the CNoC bus and we communicate
with it through the MSG RAM and the "APCS mailbox".

Konrad
> 
> Best regards,
> Krzysztof
>