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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Stephan Gerhold <stephan@gerhold.net>
Cc: Rajendra Nayak <rnayak@codeaurora.org>,
	ulf.hansson@linaro.org, robh+dt@kernel.org,
	bjorn.andersson@linaro.org, linux-pm@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, swboyd@chromium.org,
	rojay@codeaurora.org
Subject: Re: [PATCH v2 1/3] dt-bindings: power: Introduce 'assigned-performance-states' property
Date: Tue, 1 Jun 2021 17:14:26 +0530	[thread overview]
Message-ID: <20210601114426.3vhh2twocqx254b6@vireshk-i7> (raw)
In-Reply-To: <YLYV3ov/iBffZMg4@gerhold.net>

On 01-06-21, 13:12, Stephan Gerhold wrote:
> > +    child4: consumer@12341000 {
> > +        compatible = "foo,consumer";
> > +        reg = <0x12341000 0x1000>;
> > +        power-domains = <&parent4>, <&parent5>;
> > +        assigned-performance-states = <0>, <256>;
> > +    };
> 
> Bjorn already asked this in v1 [1]:
> 
> > May I ask how this is different from saying something like:
> >
> > 	required-opps = <&??>, <&rpmpd_opp_svs>;
> 
> and maybe this was already discussed further elsewhere. But I think at
> the very least we need some clarification in the commit message + the
> binding documentation how your new property relates to the existing
> "required-opps" binding.
> 
> Because even if it might not be implemented at the moment,
> Documentation/devicetree/bindings/power/power_domain.txt actually also
> specifies "required-opps" for device nodes e.g. with the following example:
> 
> 	leaky-device0@12350000 {
> 		compatible = "foo,i-leak-current";
> 		reg = <0x12350000 0x1000>;
> 		power-domains = <&power 0>;
> 		required-opps = <&domain0_opp_0>;
> 	};
> 
> It looks like Viresh added that in commit e856f078bcf1
> ("OPP: Introduce "required-opp" property").
> 
> And in general I think it's a bit inconsistent that we usually refer to
> performance states with phandles into the OPP table, but the
> assigned-performance-states suddenly use "raw numbers".

I must have missed that discussion, sorry about that.

The required-opps property, when present in device's node directly, is about the
(default) OPPs to choose for that device's normal functioning as they may not do
DVFS.

Good point Stephan.

-- 
viresh

  reply	other threads:[~2021-06-01 11:44 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27  6:12 [PATCH v2 0/3] PM / Domains: Add support for assigned-performance-states Rajendra Nayak
2021-05-27  6:12 ` [PATCH v2 1/3] dt-bindings: power: Introduce 'assigned-performance-states' property Rajendra Nayak
2021-05-27  6:16   ` Viresh Kumar
2021-05-27  6:21     ` Rajendra Nayak
2021-05-27 14:23   ` Rob Herring
2021-05-27 14:26     ` Rob Herring
2021-06-01 10:33   ` Ulf Hansson
2021-06-01 11:12   ` Stephan Gerhold
2021-06-01 11:44     ` Viresh Kumar [this message]
2021-06-02 10:45       ` Ulf Hansson
2021-06-02 10:54         ` Viresh Kumar
2021-06-02 12:50           ` Ulf Hansson
2021-06-15 15:05   ` Ulf Hansson
2021-06-18  6:01     ` Rajendra Nayak
2021-05-27  6:12 ` [PATCH v2 2/3] PM / Domains: Add support for 'assigned-performance-states' Rajendra Nayak
2021-05-27  6:12 ` [PATCH v2 3/3] arm64: dts: sc7180: Add assigned-performance-states for i2c Rajendra Nayak

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