From: Jon Hunter <jonathanh@nvidia.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Kevin Hilman <khilman@kernel.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
Stanimir Varbanov <stanimir.varbanov@linaro.org>,
Stephen Boyd <sboyd@codeaurora.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Linux PM list <linux-pm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>
Subject: Re: [RFC PATCH 0/3] PM / Domains: Add support for devices that require multiple domains
Date: Mon, 13 Mar 2017 14:27:59 +0000 [thread overview]
Message-ID: <161ee6b9-7a76-c7b4-3cb4-06259fef4898@nvidia.com> (raw)
In-Reply-To: <CAMuHMdVfkD935iJdsmTLA4HTsqXW1M21TxJfGZTmXqSPwQqY8A@mail.gmail.com>
Hi Geert,
On 13/03/17 14:19, Geert Uytterhoeven wrote:
> Hi Jon,
>
> On Mon, Mar 13, 2017 at 3:09 PM, Jon Hunter <jonathanh@nvidia.com> wrote:
>> On 13/03/17 11:45, Ulf Hansson wrote:
>>> +Björn
>>>
>>> On 13 March 2017 at 10:37, Jon Hunter <jonathanh@nvidia.com> wrote:
>>>> Looks like there is still some interest/needs in/for this. Any thoughts
>>>> on how we can move this forward?
>>>
>>> At the Linaro Connect last week, I was talking to Björn, Rajendra and
>>> Stephen more about these related issues.
>>>
>>> It definitely seems like we need to progress with this somehow,
>>> meaning we need a solution for being able to associate a device with
>>> more than one PM domain. In that context, I don't think genpd based on
>>> its current design, is a good fit to solve the problem.
>>>
>>> Instead I think we need something entirely new (perhaps some code can
>>> be borrowed from genpd), which is more similar to the clock/regulator
>>> framework. In other words, what you also were suggesting in a earlier
>>> reply.
>>> In this way, the driver/subsystem gains full flexibility of managing
>>> its device's PM domains, which seems like the best future-proof
>>> solution.
>>
>> I agree, I think that that would give us the most flexibility to handle
>> whatever scenario. However, I was thinking that we could still use the
>> genpd core to register pm-domains with and control. My thought was to
>> allow devices to have a bindings with multiple pm-domains ...
>>
>> dev-xyz {
>> ...
>> power-domains = <&domain-a>, <&domain-b>;
>> };
>>
>> Then in the genpd core we do having something like ...
>>
>> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
>> index e697dec9d25b..d1ae6ddf4903 100644
>> --- a/drivers/base/power/domain.c
>> +++ b/drivers/base/power/domain.c
>> @@ -2026,6 +2026,15 @@ int genpd_dev_pm_attach(struct device *dev)
>> "samsung,power-domain", 0);
>> if (!pd_args.np)
>> return -ENOENT;
>> + } else if (ret > 1) {
>> + /*
>> + * If there are more than one PM domain defined for a device,
>> + * then these need to be manually controlled by the device
>> + * driver because the genpd core cannot bind a device with
>
> Which device driver?
> The driver for the device that belongs to multiple PM domains?
Yes, exactly. So maybe I would need to say ... "manually controlled by
the driver for *this* device ..."
Jon
--
nvpublic
next prev parent reply other threads:[~2017-03-13 14:29 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 10:28 [RFC PATCH 0/3] PM / Domains: Add support for devices that require multiple domains Jon Hunter
2016-09-20 10:28 ` [RFC PATCH 1/3] PM / Domains: Add helper functions for finding and attaching PM domains Jon Hunter
2016-09-20 10:28 ` [RFC PATCH 2/3] PM / Domains: Add support for devices with multiple domains Jon Hunter
2016-09-20 17:54 ` Jon Hunter
2016-09-21 8:53 ` Geert Uytterhoeven
2016-09-21 10:01 ` Jon Hunter
2016-09-21 14:37 ` Jon Hunter
2016-09-21 14:57 ` Geert Uytterhoeven
2016-09-23 12:57 ` Jon Hunter
2016-09-23 14:27 ` Geert Uytterhoeven
2016-09-30 8:05 ` Jon Hunter
2016-10-07 9:14 ` Kevin Hilman
2016-10-10 11:24 ` Jon Hunter
2016-09-20 10:28 ` [RFC PATCH 3/3] dt-bindings: Add support for devices with multiple PM domains Jon Hunter
2016-10-06 6:04 ` [RFC PATCH 0/3] PM / Domains: Add support for devices that require multiple domains Rajendra Nayak
2016-10-06 8:25 ` Jon Hunter
2016-10-06 8:43 ` Rajendra Nayak
2016-10-31 10:44 ` Jon Hunter
2016-11-02 8:56 ` Rajendra Nayak
2016-11-16 13:11 ` Ulf Hansson
2016-11-17 2:31 ` Rajendra Nayak
2016-11-17 15:39 ` Stanimir Varbanov
2016-11-22 13:05 ` Ulf Hansson
2016-11-23 3:48 ` Rajendra Nayak
2016-10-06 12:22 ` Ulf Hansson
2016-10-10 11:18 ` Jon Hunter
2016-10-10 14:04 ` Ulf Hansson
2016-10-11 9:15 ` Jon Hunter
2016-11-03 14:20 ` Jon Hunter
2016-11-16 10:48 ` Jon Hunter
2016-11-16 12:53 ` Rafael J. Wysocki
2016-11-22 11:12 ` Jon Hunter
2016-11-22 13:31 ` Ulf Hansson
2016-11-22 14:28 ` Jon Hunter
2016-11-22 18:26 ` Kevin Hilman
2016-11-22 18:41 ` Jon Hunter
2016-11-24 2:30 ` Stephen Boyd
2016-11-29 11:33 ` Marek Szyprowski
2016-12-15 11:38 ` Jon Hunter
2016-11-22 21:55 ` Rafael J. Wysocki
2016-11-23 9:29 ` Jon Hunter
2016-11-23 13:15 ` Rafael J. Wysocki
2017-02-28 15:18 ` Jon Hunter
2017-02-28 15:29 ` Geert Uytterhoeven
2017-03-13 9:37 ` Jon Hunter
2017-03-13 11:45 ` Ulf Hansson
2017-03-13 14:09 ` Jon Hunter
2017-03-13 14:19 ` Geert Uytterhoeven
2017-03-13 14:27 ` Jon Hunter [this message]
2017-03-13 14:38 ` Geert Uytterhoeven
2017-03-13 14:51 ` Jon Hunter
2017-03-13 14:42 ` Ulf Hansson
2017-03-15 8:57 ` Jon Hunter
2017-03-15 3:47 ` Nayak, Rajendra
2017-03-15 9:03 ` Jon Hunter
2017-03-01 6:19 ` Rajendra Nayak
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=161ee6b9-7a76-c7b4-3cb4-06259fef4898@nvidia.com \
--to=jonathanh@nvidia.com \
--cc=bjorn.andersson@linaro.org \
--cc=geert@linux-m68k.org \
--cc=khilman@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=rjw@rjwysocki.net \
--cc=rnayak@codeaurora.org \
--cc=sboyd@codeaurora.org \
--cc=stanimir.varbanov@linaro.org \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).