linux-kernel - Re: [PATCH] regulator: tps6586x: Having slew rate settings for other than SM0/1 is not fatal

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Date:	Wed, 20 Feb 2013 08:53:39 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Mike Rapoport <mike@...pulab.co.il>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: tps6586x: Having slew rate settings for other
 than SM0/1 is not fatal

2013/2/20 Stephen Warren <swarren@...dotorg.org>:
> On 02/16/2013 04:50 AM, Axel Lin wrote:
>> Ignore the setting and show "Only SM0/SM1 can set slew rate" warning is enough,
>> then we can return 0 instead of -EINVAL in tps6586x_regulator_set_slew_rate().
>>
>> Otherwise, probe() fails.
>
> Why does probe() fail; what is trying to set a slew rate on a regulator
> that doesn't support it? At least a few days ago in linux-next, this
> patch wasn't needed AFAIK. Is the problem something new?
>

Oh, sorry for my poor Engilish.
I mean probe fails because of having slew rate settings for other than SM0/1
seems not necessary.

In tps6586x_regulator_set_slew_rate() it uses dev_warn rather than dev_err
for the default case.
We can either using "dev_warn with return 0" or use "dev_err with
return -EINVAL"
in tps6586x_regulator_set_slew_rate().

It looks to me that having slew rate settings for other than SM0/1 should be ok
if it actually is harmless ( because we can just ignore the setting ).

BTW, I read the code but I don't have this hardware.

Axel
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