linux-kernel - Re: [PATCH 07/22] clk: sunxi: Fix PLL6 calculation on sun6i

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Message-ID: <CAGb2v64+UBUZeqsy02K2x+HCh=YAAVz_wLaPVRhdD=F5zT+Ccw@mail.gmail.com>
Date:	Fri, 23 May 2014 22:43:42 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Emilio López <emilio@...pez.com.ar>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-serial@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Luc Verhaegen <libv@...net.be>
Subject: Re: [PATCH 07/22] clk: sunxi: Fix PLL6 calculation on sun6i

Hi,

On Fri, May 23, 2014 at 9:09 PM, Emilio López <emilio@...pez.com.ar> wrote:
> Hi,
>
> El 23/05/14 04:51, Chen-Yu Tsai escribió:
>
>> The N factor for PLL6 counts from 1 to 32, as specified in the A23
>> manual, and shown in Allwinner's original code.
>
>
> Are you sure about this? The A23 manual I'm looking at has a 5-bit field (so
> 0-31) on 12:8, and the examples count from 0 (eg Factor=0 N=1 ... Factor=31
> N=32).

>From the A23 manual:

Factor = 0, N = 1
Factor = 1, N = 2
Factor = 2, N = 3
 and so on


>From the A20 manual:

Factor = 0, N = 0
Factor = 1, N = 1
Factor = 2, N = 2

The "N factor" I referred to in my commit message is the N used in the
calculation,
not what is stored in the bit field.

Hope this makes it clear. :)

Cheers
ChenYu
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