linux-kernel - Re: [PATCH v3 4/5] PM / Domains: Add support for multi PM domains per device to genpd

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Message-ID: <191ed832-3b15-f47d-c171-4039da665b36@nvidia.com>
Date:   Thu, 31 May 2018 13:47:48 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Lucas Stach <dev@...xeye.de>, Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        <linux-pm@...r.kernel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Todor Tomov <todor.tomov@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 4/5] PM / Domains: Add support for multi PM domains per
 device to genpd


On 31/05/18 12:40, Lucas Stach wrote:
> Hi Ulf,
> 
> Am Donnerstag, den 31.05.2018, 12:59 +0200 schrieb Ulf Hansson:
>> To support devices being partitioned across multiple PM domains, let's
>> begin with extending genpd to cope with these kind of configurations.
>>
>> Therefore, add a new exported function genpd_dev_pm_attach_by_id(), which
>> is similar to the existing genpd_dev_pm_attach(), but with the difference
>> that it allows its callers to provide an index to the PM domain that it
>> wants to attach.
>>
>> Note that, genpd_dev_pm_attach_by_id() shall only be called by the driver
>> core / PM core, similar to how the existing dev_pm_domain_attach() makes
>> use of genpd_dev_pm_attach(). However, this is implemented by following
>> changes on top.
> 
> by_id() APIs are not really intuitive to use for driver writers. Other
> subsystems have solved this by providing a "-names" property to give
> the phandles a bit more meaning and then providing a by_name API. I
> would really appreciate if PM domains could move in the same direction.

As discussed here [0], there are plans to add that.

Cheers
Jon

[0] https://patchwork.ozlabs.org/patch/921938/

-- 
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