linux-kernel - Re: [PATCH 1/3] dt-bindings: interconnect: add clocks property to enable QoS on qcs8300

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Message-ID: <87b300a0-7ff6-4506-a27a-7a30e77c2bf6@oss.qualcomm.com>
Date: Wed, 24 Dec 2025 16:29:40 +0530
From: Odelu Kukatla <odelu.kukatla@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Georgi Djakov <djakov@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Raviteja Laggyshetty <raviteja.laggyshetty@....qualcomm.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Tipton <mike.tipton@....qualcomm.com>
Subject: Re: [PATCH 1/3] dt-bindings: interconnect: add clocks property to
 enable QoS on qcs8300



On 12/24/2025 1:25 AM, Dmitry Baryshkov wrote:
> On Fri, Nov 28, 2025 at 08:31:04PM +0530, Odelu Kukatla wrote:
>> Add 'clocks' property to enable QoS configuration. This property
>> enables the necessary clocks for QoS configuration.
>>
>> QoS configuration is essential for ensuring that latency sensitive
>> components such as CPUs and multimedia engines receive prioritized
>> access to memory and interconnect resources. This helps to manage
>> bandwidth and latency across subsystems, improving system responsiveness
>> and performance in concurrent workloads.
>>
>> Both 'reg' and 'clocks' properties are optional. If either is missing,
>> QoS configuration will be skipped. This behavior is controlled by the
>> 'qos_requires_clocks' flag in the driver, which ensures that QoS
>> configuration is bypassed when required clocks are not defined.
>>
>> Signed-off-by: Odelu Kukatla <odelu.kukatla@....qualcomm.com>
>> ---
>>  .../interconnect/qcom,qcs8300-rpmh.yaml       | 53 ++++++++++++++++---
>>  1 file changed, 47 insertions(+), 6 deletions(-)
> 
> As a generic feedback for Qualcomm interconnect drivers (please pass it
> through the team):
> 
> Please ensure that QoS-related clocks are defined in the first driver
> submission. DT bindings should describe the hardware and it's not that
> the hardware has changed between the time the first patches were
> submitted and this patchset.
> 
> I see a typical pattern that QoS support is being submitted several
> months later. Why is it so? Why can't QoS be a part of the _same_
> patchset?
> 

Hi Dmitry,
Thanks for feedback. we are ensuring that QoS-related clocks are defined
in the first driver submission like recently for Glymur/Kaanapali, there
were part of first driver submission.
QCS8300 and QCS615 are the only chip-sets, we are sending QoS patches
separately.

Thanks,
Odelu