linux-kernel - Re: [RFC] Migrate to Hz resolution for OPP binding

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Date:	Tue, 20 May 2014 18:11:33 -0500
From:	Nishanth Menon <nm@...com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	dt list <devicetree@...r.kernel.org>
Subject: Re: [RFC] Migrate to Hz resolution for OPP binding

On Tue, May 20, 2014 at 5:30 PM, Sören Brinkmann
<soren.brinkmann@...inx.com> wrote:
> Hi,
>
> I guess this is just to evaluate how big the lynch mob will be. Anyway:
> Triggered by this discussion https://lkml.org/lkml/2014/5/15/46, I
> looked a little into what it would take to migrate everybody to Hz
> frequency resolutions to avoid all the conversions between cpufreq, CCF,
> OPPs, etc.
> Turns out, OPPs are already stored in Hz resolution in the kernel, but the DT
> bindings use kHz resolution to specify them in DT. So, code-wise there
> is just a removal of a multiplication in the OPP parser (see below), but
> then there are the DT bindings...

Yep :( unfortunately, so :(

>
> As plan B, I was thinking to add the property 'operating-points-hz'...
>
> Any better ideas?

property operating-points-hz as a bool perhaps -> that modifies the
description and maintains legacy dtb support sounds OK to me if DT
folks and Rafael are ok with it as well.

Regards,
Nishanth Menon
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