linux-kernel - Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding

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Date:	Sat, 31 Oct 2015 07:50:03 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Rafael Wysocki <rjw@...ysocki.net>, robh+dt@...nel.org,
	lee.jones@...aro.org, linaro-kernel@...ts.linaro.org,
	linux-pm@...r.kernel.org, mark.rutland@....com, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, nm@...com,
	devicetree@...r.kernel.org,
	open list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding

On 30-10-15, 15:18, Stephen Boyd wrote:
> A side-note. I wonder if it would be better style to have the
> node name be:
> 
> 		opp@...000000 {

I thought the @... had a special meaning and we might end up creating
some device for the node then? Perhaps I am mistaken.

But then, yeah it will make it more readable as you mentioned.

> At least it seems that the assumption is we can store all the
> possible combinations of OPP values for a particular frequency in
> the same node. Following this style would make dt compilation
> fail if two nodes have the same frequency.

Right.

> Also, this makes it sound like opp-supported-hw is really just
> telling us if this is a supported frequency or not for the
> particular device we're running on.

That's right.

> The current wording makes it

Of the commit log ? Or the way the nodes are written?

> sound like we could have two OPP nodes with the same frequency
> but different voltages inside them, which we're trying to
> discourage by compressing the tables into less nodes.

No no, we can't have two nodes with same frequency.

-- 
viresh
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