linux-kernel - Re: [PATCH v7 05/16] clk: tegra: Add DFLL DVCO reset control for Tegra124

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Date:	Mon, 16 Feb 2015 11:40:01 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Mikko Perttunen <mikko.perttunen@...si.fi>
CC:	<swarren@...dotorg.org>, <thierry.reding@...il.com>,
	<gnurou@...il.com>, <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
	<mturquette@...aro.org>, <pwalmsley@...dia.com>,
	<vinceh@...dia.com>, <pgaikwad@...dia.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <tuomas.tynkkynen@....fi>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Subject: Re: [PATCH v7 05/16] clk: tegra: Add DFLL DVCO reset control for
 Tegra124

On Fri, Feb 13, 2015 at 12:39:03PM +0200, Mikko Perttunen wrote:
> On 02/12/2015 04:19 PM, Peter De Schrijver wrote:
> >On Thu, Jan 08, 2015 at 03:22:08PM +0200, Mikko Perttunen wrote:
> >>From: Paul Walmsley <pwalmsley@...dia.com>
> >>
> >>The DVCO present in the DFLL IP block has a separate reset line,
> >>exposed via the CAR IP block.  This reset line is asserted upon SoC
> >>reset.  Unless something (such as the DFLL driver) deasserts this
> >>line, the DVCO will not oscillate, although reads and writes to the
> >>DFLL IP block will complete.
> >>
> >>Thanks to Aleksandr Frid <afrid@...dia.com> for identifying this and
> >>saving hours of debugging time.
> >>
> >
> >Should this be done as a reset driver?
> 
> Probably through the already existing CAR reset driver. This reset
> doesn't fit well with the existing numbering scheme there, though.
> Perhaps a magic high-valued constant that represents it.
> 

Indeed. Just like only the lower part of the clock IDs map have a realtion
with the hardware registers. The rest is just arbitrary numbers.

Cheers,

Peter.
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