linux-kernel - Re: [lm-sensors] lm90 driver no longer working on PCs in 3.13

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Message-ID: <20140127185031.GA28910@roeck-us.net>
Date:	Mon, 27 Jan 2014 10:50:31 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Mark Brown <broonie@...nel.org>, Jean Delvare <khali@...ux-fr.org>,
	Liam Girdwood <lgirdwood@...il.com>, Wei Ni <wni@...dia.com>,
	linux-kernel@...r.kernel.org,
	LM Sensors <lm-sensors@...sensors.org>
Subject: Re: [lm-sensors] lm90 driver no longer working on PCs in 3.13

On Mon, Jan 27, 2014 at 10:19:24AM -0700, Stephen Warren wrote:
> On 01/26/2014 04:51 PM, Mark Brown wrote:
> > On Sun, Jan 26, 2014 at 02:04:06PM -0800, Guenter Roeck wrote:
> > 
> >> I think I have a better idea: Surround the regulator code, or at least
> >> its error handling, in the lm90 driver with
> > 
> >> 	if (IS_ENABLED(CONFIG_OF)) {
> >> 	}
> > 
> >> Would that be ok ? If yes I'll submit a patch. I'll do the same in
> >> another driver I am working on.
> > 
> > That's not going to have the desired effect in cases where DT is built
> > into the kernel but not in use on the current system (which is a
> > configuration that gets used) ...
> 
> The solution to that particular aspect of the problem is the following:
> 
> if (of_have_populated_dt()) {
> 	...
> 

Turns out that won't help either after Mark's patches to ACPI and
to the regulator core are applied. Right now I don't have a solution
that would work for all systems.

I'll leave it up to Jean to decide how to proceed.

Guenter
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