linux-kernel - Re: [PATCH] sdhci: Forward EPROBE_DEFER on vmmc and vqmmc regulators

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Date:	Mon, 07 Apr 2014 14:51:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mike Looijmans <mike.looijmans@...ic.nl>
Cc:	Ben Dooks <ben.dooks@...ethink.co.uk>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, cjb@...top.org, gdjakov@...sol.com
Subject: Re: [PATCH] sdhci: Forward EPROBE_DEFER on vmmc and vqmmc regulators

On Monday 07 April 2014 14:32:20 Mike Looijmans wrote:
> On 04/07/2014 02:25 PM, Arnd Bergmann wrote:
> 
> Judging from the kernel output, regulator_get_optional returns -ENODEV if the 
> supply wasn't found.
> 
> Maybe the API is confusing (or wrong?) here.
> 
> If you change the code as per your suggestion, the SD will not work unless you 
> explicitly assign supplies. And judging from what I've seen so far, I am the 
> first to have ever attached a power supply to this controller...

It's certainly not very "optional" if it returns an error here.

You could try to special-case the "-ENODEV" return here, but I think it
would be better to change the regulator interface to be less confusing.

	Arnd
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