linux-kernel - Re: [PATCH v7 3/5] misc: fuse: Add efuse driver for Tegra

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Date:	Wed, 11 Jun 2014 18:25:51 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Mikko Perttunen <mperttunen@...dia.com>
CC:	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 3/5] misc: fuse: Add efuse driver for Tegra

On Wed, Jun 11, 2014 at 02:47:31PM +0200, Mikko Perttunen wrote:
> On 05/06/14 16:09, Peter De Schrijver wrote:
> ...
> > +int tegra_fuse_readl(u32 offset, u32 *val)
> > +{
> > +       if (!fuse_readl)
> > +               return -ENXIO;
> > +
> > +       *val = fuse_readl(offset);
> > +
> > +       return 0;
> > +}
> > +
> 
> -EPROBE_DEFER would be a better error value, so that drivers can work 

Ok.

> even if they are initially probed before the fuse driver. Of course, if 
> the fuse initialization is moved into machine init then this is a non-issue.

The exported function will always be initialized later because on Tegra20 it
requires APB DMA to be available. If you read the fuses directly, the system
sometimes hangs.

Cheers,

Peter.
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