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Subject: Re: [PATCH v3 1/6] dt-bindings: opp: Introduce opp-peak-KBps and
 opp-avg-KBps bindings
To:     Saravana Kannan <saravanak@google.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc:     vincent.guittot@linaro.org, seansw@qti.qualcomm.com,
        daidavid1@codeaurora.org, Rajendra Nayak <rnayak@codeaurora.org>,
        sibis@codeaurora.org, bjorn.andersson@linaro.org,
        evgreen@chromium.org, kernel-team@android.com,
        linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20190703011020.151615-1-saravanak@google.com>
 <20190703011020.151615-2-saravanak@google.com>
From:   Georgi Djakov <georgi.djakov@linaro.org>
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Message-ID: <2befbd75-e0f4-dbcc-e9b1-9a9f99c084d3@linaro.org>
Date:   Fri, 26 Jul 2019 19:24:50 +0300
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In-Reply-To: <20190703011020.151615-2-saravanak@google.com>
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Hi Saravana,

On 7/3/19 04:10, 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@google.com>
> ---
>  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

As Rob already mentioned, KBps should be documented. See [1].

Thanks,
Georgi

[1] https://lore.kernel.org/lkml/20190423132823.7915-2-georgi.djakov@linaro.org/