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From: Sudeep Holla <sudeep.holla@arm.com>
To: Lukasz Luba <lukasz.luba@arm.com>
Cc: Rob Herring <robh@kernel.org>,
	daniel.lezcano@linaro.org, devicetree@vger.kernel.org,
	Viresh Kumar <viresh.kumar@linaro.org>,
	linux-pm@vger.kernel.org, rjw@rjwysocki.net,
	linux-kernel@vger.kernel.org,
	Nicola Mazzucato <nicola.mazzucato@arm.com>,
	vireshk@kernel.org, chris.redpath@arm.com,
	Ionela Voinescu <ionela.voinescu@arm.com>,
	morten.rasmussen@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/2] [RFC] CPUFreq: Add support for cpu-perf-dependencies
Date: Mon, 12 Oct 2020 17:02:46 +0100	[thread overview]
Message-ID: <20201012160232.GF16519@bogus> (raw)
In-Reply-To: <2b7b6486-2898-1279-ce9f-9e7bd3512152@arm.com>

On Mon, Oct 12, 2020 at 11:22:57AM +0100, Lukasz Luba wrote:
[...]

> 
> True, the SCMI clock does not support discovery of clock tree:
> (from 4.6.1 Clock management protocol background)
> 'The protocol does not cover discovery of the clock tree, which must be
> described through firmware tables instead.' [1]
>

By firmware, spec refers to DT or ACPI, just to be clear.

> In this situation, would it make sense, instead of this binding from
> patch 1/2, create a binding for internal firmware/scmi node?
>

Why ? I prefer to solve this in a generic way and make it not scmi
specific issue. If OPP idea Viresh suggested can be made to work, that
would be good.

> Something like:
> 
> firmware {
> 	scmi {
> 	...		
> 		scmi-perf-dep {
> 			compatible = "arm,scmi-perf-dependencies";
> 			cpu-perf-dep0 {
> 				cpu-perf-affinity = <&CPU0>, <&CPU1>;
> 			};
> 			cpu-perf-dep1 {
> 				cpu-perf-affinity = <&CPU3>, <&CPU4>;
> 			};
> 			cpu-perf-dep2 {
> 				cpu-perf-affinity = <&CPU7>;
> 			};
> 		};
> 	};
> };
> 
> The code which is going to parse the binding would be inside the
> scmi perf protocol code and used via API by scmi-cpufreq.c.
>

Not completely against it, just need to understand how is this solved
or will be solved for any DT(non SCMI) and why it can be generic.

-- 
Regards,
Sudeep

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  parent reply	other threads:[~2020-10-12 16:04 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24  9:53 [PATCH v2 0/2] CPUFreq: Add support for cpu performance dependencies Nicola Mazzucato
2020-09-24  9:53 ` [PATCH v2 1/2] dt-bindings: arm: Add devicetree binding for cpu-performance-dependencies Nicola Mazzucato
2020-10-08 13:42   ` Ionela Voinescu
2020-09-24  9:53 ` [PATCH v2 2/2] [RFC] CPUFreq: Add support for cpu-perf-dependencies Nicola Mazzucato
2020-10-06  7:19   ` Viresh Kumar
2020-10-07 12:58     ` Nicola Mazzucato
2020-10-08 11:02       ` Viresh Kumar
2020-10-08 15:03         ` Ionela Voinescu
2020-10-08 15:57           ` Rafael J. Wysocki
2020-10-08 17:08             ` Ionela Voinescu
2020-10-12 16:06             ` Sudeep Holla
2020-10-08 16:00           ` Nicola Mazzucato
2020-10-09  5:39             ` Viresh Kumar
2020-10-09 11:10               ` Nicola Mazzucato
2020-10-09 11:17                 ` Viresh Kumar
2020-10-09 14:01                 ` Rob Herring
2020-10-09 15:28                   ` Nicola Mazzucato
2020-10-12  4:19                     ` Viresh Kumar
2020-10-12 10:22                   ` Lukasz Luba
2020-10-12 10:50                     ` Rafael J. Wysocki
2020-10-12 11:05                       ` Lukasz Luba
2020-10-12 10:59                     ` Ionela Voinescu
2020-10-12 13:48                       ` Lukasz Luba
2020-10-12 16:30                         ` Ionela Voinescu
2020-10-12 18:19                           ` Lukasz Luba
2020-10-12 22:01                             ` Ionela Voinescu
2020-10-13 11:53                               ` Rafael J. Wysocki
2020-10-13 12:39                                 ` Ionela Voinescu
2020-10-15 15:56                                   ` Rafael J. Wysocki
2020-10-15 18:38                                     ` Ionela Voinescu
2020-10-12 13:59                     ` Rob Herring
2020-10-12 16:02                     ` Sudeep Holla [this message]
2020-10-12 15:54                   ` Sudeep Holla
2020-10-12 15:49               ` Sudeep Holla
2020-10-12 16:52                 ` Ionela Voinescu
2020-10-12 17:18                   ` Lukasz Luba
2020-10-14  4:25                     ` Viresh Kumar
2020-10-14  9:11                       ` Lukasz Luba
2020-10-19  8:50                       ` Nicola Mazzucato
2020-10-19  9:46                         ` Viresh Kumar
2020-10-19 13:36                           ` Nicola Mazzucato
2020-10-20 10:48                             ` Viresh Kumar
2020-10-13 13:53               ` Lukasz Luba
2020-10-14  4:20                 ` Viresh Kumar

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