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Subject: Re: [PATCH v3 4/5] PM / Domains: Add support for multi PM domains per
 device to genpd
To:     Lucas Stach <dev@lynxeye.de>, Ulf Hansson <ulf.hansson@linaro.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        <linux-pm@vger.kernel.org>
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From:   Jon Hunter <jonathanh@nvidia.com>
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Date:   Thu, 31 May 2018 13:47:48 +0100
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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/

-- 
nvpublic