linux-kernel - Re: regulator: Question about the buck_volt_range and MT6311_MAX

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Message-ID: <1438305150.32674.12.camel@mtksdaap41>
Date:	Fri, 31 Jul 2015 09:12:30 +0800
From:	Henry Chen <HenryC.Chen@...iatek.com>
To:	Axel Lin <axel.lin@...ics.com>
CC:	Mark Brown <broonie@...nel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: regulator: Question about the buck_volt_range and MT6311_MAX_UV
 setting

On Thu, 2015-07-30 at 21:10 +0800, Axel Lin wrote:

Hi Axel,

Oh..it was 1.4V on data sheet, but I think you're right, MT6311_MAX_UV
should be 1393750 was more precisely, I will change that.

Thanks.

> Hi Henry,
> Seems something wrong in either buck_volt_range or MT6311_MAX_UV setting.
> 
> .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1
> (1400000 - 600000) / 6250 + 1 = 129
> So .n_voltages = 129.
> 
> From the buck_volt_range:
> The linear range has min_sel: 0, max_sel: 0x7f
> (0 ~ 127, so 128 selector in this range)
> And the max voltage is
> 600000 + 0x7f * 6250 = 1393750
> 
> I don't have the datasheet, so can you double check this?
> Thank,
> Axel
> 
> 


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