linux-kernel - Re: [PATCH v5 09/10] clk: tegra: Implement clocks for Tegra114

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Date:	Mon, 04 Feb 2013 14:01:09 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Prashant Gaikwad <pgaikwad@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Simon Glass <sjg@...omium.org>,
	Mike Turquette <mturquette@...aro.org>,
	Joseph Lo <josephl@...dia.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 09/10] clk: tegra: Implement clocks for Tegra114

On 02/04/2013 03:45 AM, Peter De Schrijver wrote:
> On Mon, Feb 04, 2013 at 08:08:55AM +0100, Prashant Gaikwad wrote:

>>> +       /* xusb_hs_src */
>>> +       val = readl(clk_base + CLK_SOURCE_XUSB_SS_SRC);
>>> +       val |= BIT(25); /* always select PLLU_60M */
>>> +       writel(val, clk_base + CLK_SOURCE_XUSB_SS_SRC);
>>> +
>>> +       clk = clk_register_fixed_factor(NULL, "xusb_hs_src", "pll_u_60M", 0,
>>> +                                       1, 1);
>>> +       clks[xusb_hs_src] = clk;
>>> +
>>
>> With device tree we can directly use pll_u_60M, no need to register 
>> clock with fixed factor 1.
> 
> This is true for now. In the future these clocks will need to be dvfs aware
> though. I think it makes sense to have a separate clock then?

Why does DVFS-awareness require it to be a different clock/ID?
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