linux-kernel - Re: [PATCH RFT] regulator: pbias: Convert to use regmap helper functions

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Message-ID: <CAFRkauACGODncvyPs0nNC+pkr4f55Xrhgn1hmAJbKHB+GoaVWA@mail.gmail.com>
Date:	Fri, 7 Mar 2014 23:57:03 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Balaji T K <balajitk@...com>
Cc:	Chris Ball <chris@...ntf.net>, Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Florian Vaussard <florian.vaussard@...l.ch>,
	Stefan Roese <sr@...x.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH RFT] regulator: pbias: Convert to use regmap helper functions

2014-03-07 23:25 GMT+08:00 Balaji T K <balajitk@...com>:
> On Thursday 06 March 2014 06:40 PM, Axel Lin wrote:
>>
>> This patch converts this driver to use the regmap helper functions
>> provided by
>> regulator core.
>>
>> This fixes a few issues in current implementation:
>>
>> 1) In original code, the set voltage does not check max_uV,
>>     which means if request max_uV < 1800000, it will still set the voltage
>>     to 1800000.
>>
>
> Hi Axel,
>
> May be I am not getting your logic here, why would max_uV be less than
> min_uV

I think this is an unlikely case here.
>
> The intention was to set vmode to 0 for any voltage request lesser than
> 1.8V.

This statement sounds wrong to me.
For example, If the request voltage range is 1.0V ~ 1.5V.
We should return error rather than set the voltage to 1.8V (which may
damage the device).

> With regmap conversion, set voltage of 0V will become invalid. However
> since pbias is not set to 0V anywhere, I think it shouldn't be an issue.
ok.

> Will test and confirm.

Thanks,
Axel
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