From: Krzysztof Kozlowski <krzk@kernel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Rob Herring <robh@kernel.org>
Cc: Raviteja Laggyshetty <quic_rlaggysh@quicinc.com>,
Georgi Djakov <djakov@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Odelu Kukatla <quic_okukatla@quicinc.com>,
Mike Tipton <quic_mdtipton@quicinc.com>,
Sibi Sankar <quic_sibis@quicinc.com>,
linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V6 3/4] dt-bindings: interconnect: Add generic compatible qcom,epss-l3-perf
Date: Wed, 27 Nov 2024 19:27:27 +0100 [thread overview]
Message-ID: <0ba0f4af-5075-4bb1-a7f6-815ef95bbda7@kernel.org> (raw)
In-Reply-To: <zchtx32wtii2mzy2pp4lp4gdaim7w56kih7jcqes4tyhu24r3n@dagazlsdgdcv>
On 27/11/2024 17:53, Dmitry Baryshkov wrote:
> On Wed, Nov 27, 2024 at 08:23:04AM -0600, Rob Herring wrote:
>> On Mon, Nov 25, 2024 at 05:45:10PM +0000, Raviteja Laggyshetty wrote:
>>> EPSS instance on sc7280, sm8250 SoCs, use PERF_STATE register instead of
>>> REG_L3_VOTE to scale L3 clocks, hence adding a new generic compatible
>>> "qcom,epss-l3-perf" for these targets.
>>
>> Is this a h/w difference from prior blocks or you just want to use B
>> instead of A while the h/w has both A and B? The latter sounds like
>> driver policy.
>>
>> It is also an ABI break for s/w that didn't understand
>> qcom,epss-l3-perf.
>
> As the bindings keep old compatible strings in addition to the new
> qcom,epss-l3-perf, where is the ABI break? Old SW will use old entries,
> newer can use either of those.
No, this change drops qcom,epss-l3 and adds new fallback. How old
software can work in such case? It's broken.
Best regards,
Krzysztof
next prev parent reply other threads:[~2024-11-27 18:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-25 17:45 [PATCH V6 0/4] Add EPSS L3 provider support on SA8775P SoC Raviteja Laggyshetty
2024-11-25 17:45 ` [PATCH V6 1/4] interconnect: qcom: Add multidev EPSS L3 support Raviteja Laggyshetty
2024-11-30 12:49 ` Konrad Dybcio
2024-11-30 15:09 ` Dmitry Baryshkov
2024-11-30 15:12 ` Konrad Dybcio
2024-11-30 15:32 ` Dmitry Baryshkov
2024-12-26 16:13 ` Raviteja Laggyshetty
2024-12-29 1:23 ` Dmitry Baryshkov
2025-01-03 14:07 ` Raviteja Laggyshetty
2025-01-03 17:46 ` Dmitry Baryshkov
2024-11-25 17:45 ` [PATCH V6 2/4] interconnect: qcom: osm-l3: Add generic compatible for epss-l3-perf Raviteja Laggyshetty
2024-11-25 17:45 ` [PATCH V6 3/4] dt-bindings: interconnect: Add generic compatible qcom,epss-l3-perf Raviteja Laggyshetty
2024-11-25 18:00 ` Krzysztof Kozlowski
2024-11-27 14:23 ` Rob Herring
2024-11-27 16:53 ` Dmitry Baryshkov
2024-11-27 18:27 ` Krzysztof Kozlowski [this message]
2024-11-27 18:49 ` Dmitry Baryshkov
2024-11-27 19:22 ` Krzysztof Kozlowski
2024-11-27 19:45 ` Dmitry Baryshkov
2024-12-26 15:56 ` Raviteja Laggyshetty
2024-11-25 17:45 ` [PATCH V6 4/4] arm64: dts: qcom: sa8775p: add EPSS l3 interconnect provider Raviteja Laggyshetty
2024-11-27 19:21 ` Krzysztof Kozlowski
2024-11-30 12:51 ` Konrad Dybcio
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