linux-kernel - Re: [PATCH] regulator: 88pm800: add regulator driver

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Message-ID: <CAK=oMXeCUgc5E1ZaXcbrbUB6XGD135a7zRD-CC5apEytx2j=fw@mail.gmail.com>
Date:	Tue, 28 May 2013 10:32:09 +0800
From:	yi zhang <yizhang.mrvl@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>, cxie4@...vell.com,
	jett.zhou@...vell.com, linux-kernel@...r.kernel.org,
	Yi Zhang <yizhang@...vell.com>
Subject: Re: [PATCH] regulator: 88pm800: add regulator driver

HI, Brown:

2013/5/26 Mark Brown <broonie@...nel.org>:
> On Fri, May 24, 2013 at 11:01:45AM +0800, yi zhang wrote:
>> 2013/5/23 Mark Brown <broonie@...nel.org>:
>> > On Wed, May 22, 2013 at 08:10:53PM +0800, yizhang.mrvl@...il.com wrote:
>
>> >> +static const unsigned int BUCK1_table[] = {
>> >> +     /* 0x00-0x4F: from 0.6 to 1.5875V with step 0.0125V */
>> >> +     /* 0x50-0x7F: from 1.6 to 1.8V with step 0.05V */
>
>> > Write this out as code, don't use a big table for large sets of
>> > voltages.
>
>>      The voltage table is "const", if we write it out as code, seems
>> it's hard for us
>>      to keep this attribute;
>>      And the voltage of this BUCK is not linear(it's separated as two parts),
>>      seems I shouldn't use the framework helpers to implement it; Right?
>>       what do you think?
>
> You should open code the mapping functions but you should still do this
> as calcuations, it's faster and produces smaller code.  You'll need a
> small function with an if statement.
          Sorry I'm a little confused:
          You mean I should use a function for example
"create_buck_table()" to create the BUCK voltage table?
           such as:
           void create_buck_table()
           {
                   if (voltage < 1587500) {
                             /* initialize the BUCK_table */
                   } else
                             /* initialize the BUCK_table */
           }

          thanks;
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