linux-kernel - Re: [PATCH V6 3/4] dt-bindings: interconnect: Add generic compatible qcom,epss-l3-perf

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Message-ID: <20241127142304.GA3443205-robh@kernel.org>
Date: Wed, 27 Nov 2024 08:23:04 -0600
From: Rob Herring <robh@...nel.org>
To: Raviteja Laggyshetty <quic_rlaggysh@...cinc.com>
Cc: Georgi Djakov <djakov@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Odelu Kukatla <quic_okukatla@...cinc.com>,
	Mike Tipton <quic_mdtipton@...cinc.com>,
	Sibi Sankar <quic_sibis@...cinc.com>, linux-arm-msm@...r.kernel.org,
	linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 3/4] dt-bindings: interconnect: Add generic compatible
 qcom,epss-l3-perf

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.

> 
> Signed-off-by: Raviteja Laggyshetty <quic_rlaggysh@...cinc.com>
> ---
>  .../devicetree/bindings/interconnect/qcom,osm-l3.yaml      | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
> index 21dae0b92819..e24399ca110f 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
> @@ -28,12 +28,15 @@ properties:
>            - const: qcom,osm-l3
>        - items:
>            - enum:
> -              - qcom,sc7280-epss-l3
>                - qcom,sc8280xp-epss-l3
>                - qcom,sm6375-cpucp-l3
> -              - qcom,sm8250-epss-l3
>                - qcom,sm8350-epss-l3
>            - const: qcom,epss-l3
> +      - items:
> +          - enum:
> +              - qcom,sc7280-epss-l3
> +              - qcom,sm8250-epss-l3
> +          - const: qcom,epss-l3-perf
>  
>    reg:
>      maxItems: 1
> -- 
> 2.39.2
>