From: Viresh Kumar <viresh.kumar@linaro.org>
To: Rob Herring <robh@kernel.org>
Cc: Rafael Wysocki <rjw@rjwysocki.net>,
nm@ti.com, sboyd@codeaurora.org, linaro-kernel@lists.linaro.org,
linux-pm@vger.kernel.org, rob.herring@linaro.org,
lee.jones@linaro.org, Mark Brown <broonie@kernel.org>,
devicetree@vger.kernel.org,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
open list <linux-kernel@vger.kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Pawel Moll <pawel.moll@arm.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [PATCH 01/16] PM / OPP: Add 'supply-names' binding
Date: Thu, 8 Oct 2015 14:57:09 +0530 [thread overview]
Message-ID: <20151008092709.GC18898@linux> (raw)
In-Reply-To: <20150915024747.GI32551@linux>
Rob,
On 15-09-15, 08:17, Viresh Kumar wrote:
> 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.
Not sure if you still have any objections to this patch?
--
viresh
next prev parent reply other threads:[~2015-10-08 9:27 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
2015-10-08 9:27 ` Viresh Kumar [this message]
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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