linux-kernel - Re: [RFC PATCH v2 2/6] dt-bindings: opp: accept array of frequencies

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Message-ID: <YlWZfioKrHO9tqQv@ripper>
Date:   Tue, 12 Apr 2022 08:23:42 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [RFC PATCH v2 2/6] dt-bindings: opp: accept array of frequencies

On Mon 11 Apr 08:43 PDT 2022, Krzysztof Kozlowski wrote:

> Devices might need to control several clocks when scaling the frequency
> and voltage.  Allow passing array of clock frequencies, similarly to the
> voltages.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  Documentation/devicetree/bindings/opp/opp-v2-base.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
> index 76c8acd981b3..1d7216008f95 100644
> --- a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
> +++ b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
> @@ -50,6 +50,14 @@ patternProperties:
>            property to uniquely identify the OPP nodes exists. Devices like power
>            domains must have another (implementation dependent) property.
>  
> +          This can be also an array of frequencies for each clock provided to the
> +          device.  In such case value of 0 means the clock frequency should not
> +          be configured for given clock.
> +        minItems: 1
> +        maxItems: 16
> +        items:
> +          maxItems: 1
> +
>        opp-microvolt:
>          description: |
>            Voltage for the OPP
> -- 
> 2.32.0
>