linux-kernel - Re: [PATCH 1/2] MFD: MAX77693: add MAX77693 MFD driver

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Date:	Mon, 12 Dec 2011 19:03:01 +0900
From:	Donggeun Kim <dg77.kim@...sung.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	sameo@...ux.intel.com, myungjoo.ham@...sung.com,
	kyungmin.park@...sung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] MFD: MAX77693: add MAX77693 MFD driver

On 2011년 12월 12일 18:48, Mark Brown wrote:
> On Mon, Dec 12, 2011 at 06:02:40PM +0900, Donggeun Kim wrote:
>> On 2011년 12월 09일 18:58, Mark Brown wrote:
>>> On Fri, Dec 09, 2011 at 06:15:39PM +0900, Donggeun Kim wrote:
> 
>>>> +	if (max77693_read_reg(i2c, MAX77693_PMIC_REG_PMIC_ID2, &reg_data) < 0) {
> 
>>> I'd suggest also verifying that the ID register has the expected value.
>>> If there's a chip reision register logging it can be helpful.
> 
>> The all expected values for the register are not specified at datasheet.
>> The perpose of the read function is simply checking the existence of the
>> device so that the following operations are stopped for error case.
> 
> With a name like "ID" it's clearly chip idenfication - you should at
> least be displaying the value if it might change as it's likely to be
> useful for diagnostics.
> 
It would be changed to display the value from the register in normal case.

Thanks.
-Donggeun
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