linux-kernel - Re: [PATCH v4 2/2] dt: power: st: Provide bindings for ST's OPPs

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Date:	Wed, 2 Sep 2015 13:36:39 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robherring2@...il.com>,
	Nishanth Menon <nm@...com>, kernel@...inux.com,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sebastian Reichel <sre@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Ajit Pal Singh <ajitpal.singh@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 2/2] dt: power: st: Provide bindings for ST's OPPs

On 26-08-15, 13:06, Lee Jones wrote:
> On Wed, 12 Aug 2015, Viresh Kumar wrote:
> 
> > On 11-08-15, 16:17, Lee Jones wrote:
> > > This would work if we only had a single variable to contend with, but
> > > what I showed you in my previous example is that we have 3 variables
> > > to consider; cut (version), pcode and substrate.
> > > 
> > > Using the two (simple) examples I provided, how would your suggestion
> > > look in our case?
> > 
> > So the solution I gave is for picking the microvolt based on pcode.
> > The other two (cut, substrate) aren't about picking microvolt, but if
> > the OPP is available or not. Right?
> 
> 'pcode', 'cut' and 'substrate' all determine whether a given set of
> OPPs an be used on the running platform.  I do not believe that you
> can differentiate between them. 
> 
> > If these terms are generic enough, then we can add something similar
> > to what you have added..
> 
> If it makes it easier, you can treat them as version numbers 2.2.1
> <pcode.cut.substrate>, but I don't see how this can help.  Obviously
> this becomes more difficult when you add wild cards to the OPPs, where
> a particular OPP would be suitable for all cuts for example.
> 
> If you still think you can come up with a generic method to lay out
> CPUFreq OPP nodes that will satisfy all vendors and not be a mass of
> 10's of separate nodes, then great.  Again, I'm struggling to see how
> that might be possible.
> 
> What I believe we shouldn't do, is have this blocked forever for the
> sake of adding a couple of vendor properties however.

I agree and can understand the pain you are feeling..

@Rob/Stephen: Please close this thread soon and let Lee get his work
done :)

-- 
viresh
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