linux-kernel - Re: [PATCH] arm/arm64: dts: Drop "arm,armv8-pmuv3" compatible usage

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Date: Mon, 15 Apr 2024 22:00:05 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Rob Herring <robh@...nel.org>
Cc: Bjorn Andersson <quic_bjorande@...cinc.com>, soc@...nel.org,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Dinh Nguyen <dinguyen@...nel.org>,
 Tsahee Zidenberg <tsahee@...apurnalabs.com>,
 Antoine Tenart <atenart@...nel.org>,
 Khuong Dinh <khuong@...amperecomputing.com>,
 Liviu Dudau <liviu.dudau@....com>, Sudeep Holla <sudeep.holla@....com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Ray Jui <rjui@...adcom.com>,
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 Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
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Subject: Re: [PATCH] arm/arm64: dts: Drop "arm,armv8-pmuv3" compatible usage

On 4/15/24 19:41, Dmitry Baryshkov wrote:
> On Mon, 15 Apr 2024 at 20:15, Rob Herring <robh@...nel.org> wrote:
>>
>> On Mon, Apr 15, 2024 at 12:05 PM Rob Herring <robh@...nel.org> wrote:
>>>
>>> On Mon, Apr 15, 2024 at 11:52 AM Dmitry Baryshkov
>>> <dmitry.baryshkov@...aro.org> wrote:
>>>>
>>>> On Mon, 15 Apr 2024 at 16:46, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>>>>>
>>>>> On Fri, Apr 12, 2024 at 05:28:51PM -0500, Rob Herring wrote:
>>>>> [..]
>>>>>>   arch/arm64/boot/dts/qcom/qcm2290.dtsi                | 2 +-
>>>>>>   arch/arm64/boot/dts/qcom/qdu1000.dtsi                | 2 +-
>>>>>>   arch/arm64/boot/dts/qcom/sdm630.dtsi                 | 2 +-
>>>>>>   arch/arm64/boot/dts/qcom/sdx75.dtsi                  | 2 +-
>>>>>
>>>>> Acked-by: Bjorn Andersson <andersson@...nel.org>
>>>>
>>>> Note, we'd need to override PMU compatibles in sdm636.dtsi and
>>>> sdm660.dtsi. Ideally it should come as the same patch.
>>>
>>> Uh, that's an A for reuse, but an F for readability... It's sdm632 as
>>> well. Will drop sdm630.
>>
>> Actually, aren't those Kryo cores just Cortex-A53 derivatives? So the
>> A53 PMU compatible is an improvement over the generic one still. We
>> can't just add kryo260-pmu compatibles because that breaks
>> compatibility. We could have a fallback, but then that introduces a
>> pattern we don't want.
> 
> I think it is believed that Gold cores are A73-derivatives.

8xA53 on 630
4xA53+4xA73 on 636/660

Konrad