From: Viresh Kumar <viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Rafael Wysocki <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>,
nm-l0cyMroinI0@public.gmane.org,
sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linaro-kernel-cunTk1MwBs8s++Sfvej+rw@public.gmane.org,
linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
rob.herring-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
"Rafael J. Wysocki"
<rafael.j.wysocki-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 01/16] PM / OPP: Add 'supply-names' binding
Date: Tue, 15 Sep 2015 08:17:47 +0530 [thread overview]
Message-ID: <20150915024747.GI32551@linux> (raw)
In-Reply-To: <55F72C97.2030306-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
On 14-09-15, 15:22, Rob Herring wrote:
> What if we have a 2nd device and supply rail? For example, what if the
> L2$ has a separate rail from the cores but is linked to the OPPs.
Right, so that is the case with the Mediatek SoC as well, AFAIR. How
do we plan to treat L2 devices? For example, in the mediatek cpufreq
driver, they change L2's supplies together with CPUs.
One way to get that done, with such very closely bound devices is to
add two regulators:
cpu-supply = ...;
l2-supply = ...;
And then a property in OPP table:
supply-name = "cpu", "l2";
And maybe fix the order in which the supplies which be updated, based
on the order in which entries are present in the above property.
Any other way you suggest for doing that ?
> Remind me of when do we have multiple regulators for a cpu?
I haven't seen that yet, but its more like what I explained above.
i.e. one for the CPU and other one for the L2 cache.
But, these bindings do apply for other devices as well, where it
should be very much possible.
--
viresh
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next prev parent reply other threads:[~2015-09-15 2:47 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 12:01 [PATCH 00/16] PM / OPP: multiple regulators & opp-transition support Viresh Kumar
2015-09-11 12:01 ` [PATCH 01/16] PM / OPP: Add 'supply-names' binding Viresh Kumar
2015-09-14 20:22 ` Rob Herring
[not found] ` <55F72C97.2030306-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-09-15 2:47 ` Viresh Kumar [this message]
2015-10-08 9:27 ` Viresh Kumar
2015-10-16 0:22 ` Stephen Boyd
2015-10-16 6:02 ` Viresh Kumar
2015-10-16 19:16 ` Stephen Boyd
2015-10-17 4:10 ` Viresh Kumar
2015-10-21 13:18 ` Viresh Kumar
2015-10-22 16:39 ` Mark Brown
2015-10-27 8:19 ` Viresh Kumar
2015-10-28 8:17 ` Mark Brown
[not found] ` <20151028081742.GC28319-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-10-29 23:38 ` Stephen Boyd
2016-03-01 6:45 ` Viresh Kumar
2016-03-01 15:09 ` Nishanth Menon
2016-03-02 2:50 ` Mark Brown
2016-03-02 10:28 ` Viresh Kumar
2016-03-02 11:24 ` Mark Brown
2016-03-02 15:26 ` Nishanth Menon
2016-03-02 15:30 ` Mark Brown
2016-03-02 15:43 ` Nishanth Menon
2015-10-22 16:30 ` Mark Brown
2015-09-11 12:01 ` [PATCH 02/16] PM / OPP: Add 'opp-microvolt-triplets' binding Viresh Kumar
2015-09-14 20:30 ` Rob Herring
2015-09-15 3:30 ` Viresh Kumar
2015-09-19 15:39 ` Mark Brown
2015-09-11 12:01 ` [PATCH 03/16] PM / OPP: Improve debug print messages with pr_fmt Viresh Kumar
2015-09-11 12:02 ` [PATCH 04/16] PM / OPP: Rename routines specific to old bindings with _v1 Viresh Kumar
2015-09-11 12:02 ` [PATCH 05/16] PM / OPP: Parse all power-supply related bindings together Viresh Kumar
2015-09-11 12:02 ` [PATCH 06/16] PM / OPP: Create separate structure for regulator/supplies Viresh Kumar
2015-09-11 12:02 ` [PATCH 07/16] PM / OPP: Add multiple regulators support Viresh Kumar
2015-09-11 12:02 ` [PATCH 08/16] PM / OPP: get/put regulators from OPP core Viresh Kumar
2015-09-11 12:02 ` [PATCH 09/16] PM / OPP: Disable OPPs that aren't supported by the regulators Viresh Kumar
2015-09-11 12:02 ` [PATCH 10/16] PM / OPP: Introduce dev_pm_opp_get_max_volt_latency() Viresh Kumar
2015-09-11 12:02 ` [PATCH 11/16] PM / OPP: Introduce dev_pm_opp_get_max_transition_latency() Viresh Kumar
2015-09-11 12:02 ` [PATCH 12/16] PM / OPP: Parse clock and voltage tolerance for v1 bindings Viresh Kumar
2015-09-11 12:02 ` [PATCH 13/16] PM / OPP: Manage device clk as well Viresh Kumar
2015-09-11 12:02 ` [PATCH 14/16] PM / OPP: Add dev_pm_opp_set_regulator() to specify regulator Viresh Kumar
2015-09-11 12:02 ` [PATCH 15/16] PM / OPP: Add dev_pm_opp_set_rate() Viresh Kumar
2015-09-11 12:02 ` [PATCH 16/16] PM / OPP: don't print error message for deferred probing Viresh Kumar
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