linux-kernel - Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

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Date:	Thu, 8 Aug 2013 18:07:52 +0800
From:	Wei Ni <wni@...dia.com>
To:	Alexander Shiyan <shc_work@...l.ru>
CC:	Guenter Roeck <linux@...ck-us.net>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

On 08/08/2013 05:57 PM, Alexander Shiyan wrote:
>> On 08/08/2013 04:42 PM, Guenter Roeck wrote:
>>> On 08/07/2013 11:56 PM, Wei Ni wrote:
>>>> The device lm90 can be controlled by the vdd rail.
>>>> Adding the power control support to power on/off the vdd rail.
>>>> And make sure that power is enabled before accessing the device.
>>>>
>>>> Signed-off-by: Wei Ni <wni@...dia.com>
>>>> ---
>>>>   drivers/hwmon/lm90.c |   49 +++++++++++++++++++++++++++++++++++++++++++++++++
> [...]
>>> I consider the messages unnecessary and confusing. You are polluting the log
>>> of pretty much every PC user who has one of the supported chips in the system,
>>> and of everyone else not using regulators for this chip.
>>
>> Ok, I will remove these codes.
>> So I will write something like:
>> if (!IS_ERR(data->lm90_reg)) {
>>     ret = regulator_enable(data->lm90_reg);
>>     if (ret < 0) {
>>         dev_err();
>>         return ret;
>>     }
>> } else {
>>     if (PTR_ERR(data->lm90_reg) == -EPROBE_DEFER)
>>         return -EPRPBE_DEFER;
>>
>>         data->lm90_reg = !!IS_ERR(data->lm90_reg);

BTW, since it may return EPROBE_DEFER, these codes should be put in the
beginning of the probe() function, should before allocate lm90_data.

> 
> No. You do not need this line.
> 
> Just use in remove():
> if (!IS_ERR(data->lm90_reg))
> regulator_disable(data->lm90_reg);
> 
> ---
> 

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