linux-kernel - Re: [PATCH v2 1/2] pmbus: add regulator support

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Date:	Sat, 23 Aug 2014 07:00:44 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	atull <atull@...nsource.altera.com>,
	Mark Brown <broonie@...nel.org>
CC:	jdelvare@...e.de, lm-sensors@...sensors.org, lgirdwood@...il.com,
	linux-kernel@...r.kernel.org, delicious.quinoa@...il.com,
	dinguyen@...nsource.altera.com, yvanderv@...nsource.altera.com
Subject: Re: [PATCH v2 1/2] pmbus: add regulator support

On 08/22/2014 05:31 PM, atull wrote:
> On Fri, 22 Aug 2014, Mark Brown wrote:
>
>> On Fri, Aug 22, 2014 at 04:11:33PM -0500, atull@...nsource.altera.com wrote:
>>
>>> +	if (pdata && pdata->reg_init_data) {
>>> +		config.init_data = pdata->reg_init_data;
>>> +	} else {
>>> +		config.init_data = of_get_regulator_init_data(dev, np);
>>> +		if (!config.init_data)
>>> +			return -ENOMEM;
>>> +	}
>>
>> It should be fine to start with no init data - just let the regulator
>> core worry about it.  This will allow users to read back the state even
>> if they can't change anything which is useful for system bringup or
>> general debugging.
>>
>
> of_get_regulator_init_data() will only have an error if it cannot alloc
> the regulator_init_data struct.  That's why I did -ENOMEM.  If there
> is no platform data and nothing about the regulator in the device tree, we
> should end up with a zeroed out regulator_init_data.
>
Yes, but if OF is not defined it will return NULL as well. Unless I am
missing something, that means that the code will now fail if there is
no platform init data and OF is not configured.

Guenter

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