linux-kernel - Re: [PATCH] regulator: rk808: Fix min

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Message-ID: <54335E0B.301@rock-chips.com>
Date:	Tue, 07 Oct 2014 11:29:15 +0800
From:	Chris Zhong <zyw@...k-chips.com>
To:	Mark Brown <broonie@...nel.org>,
	Heiko Stübner <heiko@...ech.de>
CC:	Doug Anderson <dianders@...omium.org>,
	linux-rockchip@...ts.infradead.org,
	Liam Girdwood <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: rk808: Fix min_uV for DCDC1 & DCDC2


On 10/01/2014 06:52 AM, Mark Brown wrote:
> On Tue, Sep 30, 2014 at 06:57:51PM +0200, Heiko Stübner wrote:
>> Am Dienstag, 30. September 2014, 09:43:47 schrieb Doug Anderson:
>>> On Tue, Sep 30, 2014 at 2:44 AM, Chris Zhong <zyw@...k-chips.com> wrote:
>>>> -       REGULATOR_LINEAR_RANGE(700000, 0, 63, 12500),
>>>> +       REGULATOR_LINEAR_RANGE(712500, 0, 63, 12500),
>>> I have no problem with this (and the current "dts" file I see don't go
>>> this low anyway), but it doesn't match the datasheet I have right now
>>> which says "0.700 V" is the min.
>> Then it would be problem.
>> The original statement above says, that a register value of "0" equals 700mV,
>> so changing this in this way would mean everything runs 12.5mV above the
>> target voltage.
>> And I can confirm, that the current datasheet lists 700mV as equallying
>> register value 0.
> Has anyone got a voltmeter?
The latest datasheet has fixed this error.
The register value of "0" equals 712.5mV, so the max value can reach 
1.5v but not 1.4875v.

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