linux-kernel - Re: [PATCH 1/2] dt-bindings: net: qcom,ipa: document qcm2290 compatible

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Message-ID: <a47ceee1-6530-4f3d-971e-450069ede557@ieee.org>
Date: Fri, 23 May 2025 13:58:38 -0500
From: Alex Elder <elder@...e.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Wojciech Slenska <wojciech.slenska@...il.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Alex Elder <elder@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: net: qcom,ipa: document qcm2290
 compatible

On 12/20/24 7:25 AM, Konrad Dybcio wrote:
> On 20.12.2024 8:35 AM, Wojciech Slenska wrote:
>> Document that ipa on qcm2290 uses version 4.2, the same
>> as sc7180.
>>
>> Signed-off-by: Wojciech Slenska <wojciech.slenska@...il.com>
>> ---
> 
> FWIW this needs some more work on the Linux side, the IPA driver
> currently hardcodes a reference to IMEM, which has a different
> base between these two SoCs.

Everything currently assumes the IPA version dictates many things.
That works, so far.  But a lot of these fixed/hard-coded definitions
(per version) could be changed for specific implementations--they
just haven't needed to be.

> The IMEM region doesn't seem to be used as of current, but things
> will explode the second it is.
> 
> A long overdue update would be to make the IPA driver consume
> a syscon/memory-region-like property pointing to IMEM (or a slice
> of it, maybe Alex knows what it was supposed to be used for).

Yes, we talked about this last year, or the year before.

Konrad's patches to put this in DT is the right solution.
It doesn't matter that it's six months later.  I really
appreciate the improvement.

					-Alex

> 
> Konrad