linux-kernel - Re: [PATCH 01/13] clk: tegra: Add binding for the Tegra124 DFLL clocksource

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Message-ID: <53C01558.3090607@nvidia.com>
Date:	Fri, 11 Jul 2014 19:48:24 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Andrew Bresticker <abrestic@...omium.org>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 01/13] clk: tegra: Add binding for the Tegra124 DFLL clocksource



On 11/07/14 19:28, Andrew Bresticker wrote:
> On Thu, Jul 10, 2014 at 2:42 PM, Tuomas Tynkkynen <ttynkkynen@...dia.com> wrote:
>> The DFLL is the main clocksource for the fast CPU cluster on Tegra124
>> and also provides automatic CPU rail voltage scaling as well. The DFLL
>> is a separate IP block from the usual Tegra124 clock-and-reset
>> controller, so it gets its own node in the device tree.
>
>> diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
>
>> +- nvidia,pmic-voltage-table: Array of 2-tuples.  Each entry should have the
>> +  form <register-value voltage-in-uV>, indicating the register value that
>> +  needs to be programmed to the PMIC for changing the VDD_CPU voltage to
>> +  the specified voltage. The table must be in ascending order by the voltage.
>
> Instead of listing the register values for each voltage in the DT,
> can't you use regulator_list_voltage() to create this map?
>

I don't see a way to get the register values that way, unless we assume 
that the mapping is linear and doesn't have holes.

-- 
nvpublic
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