Re: [PATCH v3 1/6] dt-bindings: opp: Introduce opp-peak-KBps and opp-avg-KBps bindings

[Sibi Sankar]

Hey Saravana,

https://patchwork.kernel.org/patch/10850815/
There was already a discussion ^^ on how bandwidth bindings were to be
named.

On 7/3/19 6:40 AM, Saravana Kannan wrote:
> Interconnects often quantify their performance points in terms of
> bandwidth. So, add opp-peak-KBps (required) and opp-avg-KBps (optional) to
> allow specifying Bandwidth OPP tables in DT.
>
> opp-peak-KBps is a required property that replace opp-hz for Bandwidth OPP
> tables.
>
> opp-avg-KBps is an optional property that can be used in Bandwidth OPP
> tables.
>
> Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
> ---
>   Documentation/devicetree/bindings/opp/opp.txt | 15 ++++++++++++---
>   1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
> index 76b6c79604a5..c869e87caa2a 100644
> --- a/Documentation/devicetree/bindings/opp/opp.txt
> +++ b/Documentation/devicetree/bindings/opp/opp.txt
> @@ -83,9 +83,14 @@ properties.
>   
>   Required properties:
>   - opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a
> -  required property for all device nodes but devices like power domains. The
> -  power domain nodes must have another (implementation dependent) property which
> -  uniquely identifies the OPP nodes.
> +  required property for all device nodes but for devices like power domains or
> +  bandwidth opp tables. The power domain nodes must have another (implementation
> +  dependent) property which uniquely identifies the OPP nodes. The interconnect
> +  opps are required to have the opp-peak-bw property.
> +
> +- opp-peak-KBps: Peak bandwidth in kilobytes per second, expressed as a 32-bit
> +  big-endian integer. This is a required property for all devices that don't
> +  have opp-hz. For example, bandwidth OPP tables for interconnect paths.
>   
>   Optional properties:
>   - opp-microvolt: voltage in micro Volts.
> @@ -132,6 +137,10 @@ Optional properties:
>   - opp-level: A value representing the performance level of the device,
>     expressed as a 32-bit integer.
>   
> +- opp-avg-KBps: Average bandwidth in kilobytes per second, expressed as a
> +  32-bit big-endian integer. This property is only meaningful in OPP tables
> +  where opp-peak-KBps is present.
> +
>   - clock-latency-ns: Specifies the maximum possible transition latency (in
>     nanoseconds) for switching to this OPP from any other OPP.
>   

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