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From: Lukasz Luba <lukasz.luba@arm.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
	vireshk@kernel.org, daniel.lezcano@linaro.org, rjw@rjwysocki.net,
	linux-kernel@vger.kernel.org, robh+dt@kernel.org,
	Nicola Mazzucato <nicola.mazzucato@arm.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	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: Wed, 14 Oct 2020 10:11:30 +0100	[thread overview]
Message-ID: <666fc9cf-ac5a-2289-d838-14c36dc8dfcb@arm.com> (raw)
In-Reply-To: <20201014042531.r7iykzygkvmpsqck@vireshk-i7>



On 10/14/20 5:25 AM, Viresh Kumar wrote:
> On 12-10-20, 18:18, Lukasz Luba wrote:
>> On 10/12/20 5:52 PM, Ionela Voinescu wrote:
>>> On Monday 12 Oct 2020 at 16:49:30 (+0100), Sudeep Holla wrote:
>>>> On Fri, Oct 09, 2020 at 11:09:21AM +0530, Viresh Kumar wrote:
>>>>> - I wonder if we can keep using that instead of creating new bindings
>>>>>     for exact same stuff ? Though the difference here would be that the
>>>>>     OPP may not have any other entries.
>>>>
>>>> Well summarised, sorry for chiming in late. I could have not summarised
>>>> any better. Just saw the big thread and was thinking of summarising.
>>>> If the last point on OPP is possible(i.e. no OPP entries but just use
>>>> it for fetch the information) for $subject patch is trying to achieve,
>>>> then it would be good.
> 
> Under normal circumstances, I wouldn't have suggested empty opp-tables
> for sure but it doesn't seem worth adding another binding to get this
> information out :)
> 
>>>
>>> Just to put in my two pennies worth: using opp-shared (in possibly empty
>>> OPP table) as alternative to cpu-perf-dependencies sounds good enough
>>> to me as well.
>>
>> +1
> 
> Now that (almost) everyone agrees, I don't think we need to make any
> change anywhere, in code or bindings. This should work right now as
> well.  The code should never try to create OPP tables and the core
> will not create one. Your driver (which want to get this information
> out of empty OPP tables) shall call dev_pm_opp_of_get_sharing_cpus(),
> which just parses the DT to get this information out.
> 

Thank you Viresh. We are going to experiment with this and come back
soon.

Regards,
Lukasz

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  reply	other threads:[~2020-10-14  9:13 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
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 [this message]
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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