linux-kernel - Re: [PATCH 2/2 v7] pinmux: add a driver for the U300 pinmux

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Date:	Wed, 28 Sep 2011 13:58:50 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Barry Song <21cnbao@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Joe Perches <joe@...ches.com>,
	Russell King <linux@....linux.org.uk>,
	Linaro Dev <linaro-dev@...ts.linaro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	David Brown <davidb@...eaurora.org>
Subject: Re: [PATCH 2/2 v7] pinmux: add a driver for the U300 pinmux

On Wed, Sep 28, 2011 at 2:15 AM, Stephen Warren <swarren@...dia.com> wrote:

> But can't debugfs just get its information from the device name field in
> the mapping table? I'm not sure why the need to use that information for
> debugfs prevents the having entries with both the hog flag set and a
> device name set?

That feels unsafe - then you have some string claiming to represent the
device for that pinmux, but the system has not matched that string
against dev_name() for any real device, so it could be a lie, any string
like "foo" would do.

What I do now for U300 is complete resolution by matching dev_name
in the mapping to dev_name(device) on the struct device * actually
instantiated, which means you're 100% sure it is really mapped
to that very device.

I like this since it's much more stringent...

Yours,
Linus Walleij
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