linux-kernel - Re: [PATCH 20/21] ASoC: codecs: Enable AB8500 CODEC for Device Tree

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Message-ID: <20120726142825.GK3099@opensource.wolfsonmicro.com>
Date:	Thu, 26 Jul 2012 15:28:26 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	arnd@...db.de, sameo@...ux.intel.com, olalilja@...oo.se,
	ola.o.lilja@...ricsson.com, alsa-devel@...a-project.org, lrg@...com
Subject: Re: [PATCH 20/21] ASoC: codecs: Enable AB8500 CODEC for Device Tree

On Thu, Jul 26, 2012 at 03:00:17PM +0100, Lee Jones wrote:
> On 26/07/12 12:50, Mark Brown wrote:

> >Yet again no binding documentation....

> RFC. ;)

> I'll write the documentation when/if the properties are accepted.

No, write the documentation.  It's way too much effort to reverse
engineer the bindings from the code.

> >>+		default :
> >>+			codec->ear_cmv = EAR_CMV_UNKNOWN;
> >>+			dev_err(dev, "Unsuitable earpiece voltage found in DT\n");

> >The platform data code picks a default, can't the DT code do the same?

> No, I don't think that it does? The original code returns -EINVAL
> unless a value is specified.

The code doesn't specify values for the enumeration so it ought to
default to EAR_CMV_0_95V if nothing is specified.

> The original author is keen to have a clear error message in case
> users try to specify non-exact values. I'd rather we fail-out than
> use incorrect values which would be a great deal harder for a user
> to debug.

By that argument all the properties should be mandatory but it's only
this one IIRC.

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