linux-kernel - Re: [PATCH v2 1/3] dt-bindings: interconnect: add reg and clocks properties to enable QoS on sa8775p

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Message-ID: <175992988039.3401317.7332721222365860442.robh@kernel.org>
Date: Wed, 8 Oct 2025 08:24:40 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Odelu Kukatla <odelu.kukatla@....qualcomm.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	linux-kernel@...r.kernel.org,
	Konrad Dybcio <konradybcio@...nel.org>,
	Georgi Djakov <djakov@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	devicetree@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
	linux-arm-msm@...r.kernel.org,
	Mike Tipton <mike.tipton@....qualcomm.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Raviteja Laggyshetty <raviteja.laggyshetty@....qualcomm.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: interconnect: add reg and clocks
 properties to enable QoS on sa8775p


On Wed, 01 Oct 2025 13:03:42 +0530, Odelu Kukatla wrote:
> Add 'reg' and 'clocks' properties to enable QoS configuration. These
> properties enable access to QoS registers and necessary clocks for
> 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,sa8775p-rpmh.yaml       | 50 ++++++++++++++++++-
>  1 file changed, 49 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>