linux-kernel - Re: [PATCH v5 1/5] dt-bindings: ufs: common: add OPP table

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Date:   Wed, 11 Oct 2023 20:32:42 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v5 1/5] dt-bindings: ufs: common: add OPP table

On 11/10/2023 14:25, Manivannan Sadhasivam wrote:
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Except scaling UFS and bus clocks, it's necessary to scale also the
> voltages of regulators or power domain performance state levels.  Adding
> Operating Performance Points table allows to adjust power domain
> performance state, depending on the UFS clock speed.
> 
> OPPv2 deprecates previous property limited to clock scaling:
> freq-table-hz.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  .../devicetree/bindings/ufs/ufs-common.yaml   | 35 +++++++++++++++++--
>  1 file changed, 32 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> index bbaee4f5f7b2..1cb022cdc349 100644
> --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> @@ -6,6 +6,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
>  title: Common properties for Universal Flash Storage (UFS) Host Controllers
>  
> +

Drop blank line.

>  maintainers:
>    - Alim Akhtar <alim.akhtar@...sung.com>
>    - Avri Altman <avri.altman@....com>
> @@ -20,11 +21,24 @@ properties:
>        items:
>          - description: Minimum frequency for given clock in Hz
>          - description: Maximum frequency for given clock in Hz
> +    deprecated: true
>      description: |
> +      Preferred is operating-points-v2.
> +
>        Array of <min max> operating frequencies in Hz stored in the same order
> -      as the clocks property. If this property is not defined or a value in the
> -      array is "0" then it is assumed that the frequency is set by the parent
> -      clock or a fixed rate clock source.
> +      as the clocks property. If either this property or operating-points-v2 is
> +      not defined or a value in the array is "0" then it is assumed that the
> +      frequency is set by the parent clock or a fixed rate clock source.
> +
> +  operating-points-v2:
> +    description:
> +      Preferred over freq-table-hz.
> +      If present, each OPP must contain array of frequencies stored in the same
> +      order for each clock.  If clock frequency in the array is "0" then it is
> +      assumed that the frequency is set by the parent clock or a fixed rate
> +      clock source.
> +
> +  opp-table: true

opp-table:
  type: object



Best regards,
Krzysztof