[alsa-devel] [PATCH v2 06/32] ASoC: rt5651: Configure jack-detect source through a device-property

[Mark Brown]

On Fri, Mar 02, 2018 at 10:32:25AM +0100, Hans de Goede wrote:
> On 01-03-18 23:35, Hans de Goede wrote:

> > It is not _that_ fragile, but I agree that it would be good to add
> > a comment about not moving the property-parsing to the codec driver.

> So one other solution which comes to mind here is to move the
> snd_soc_card_jack_new() call into the codec driver's
> rt5651_apply_properties() function (conditional on a jack src being
> set in the properties).

> This would make the machine driver code look like this:
> 
> 	props[cnt++] = PROPERTY_ENTRY_...
> 	props[cnt++] = PROPERTY_ENTRY_...
> 	props[cnt++] = PROPERTY_ENTRY_...
> 	props[cnt++] = PROPERTY_ENTRY_...

> 	ret = device_add_properties(codec->dev, props);
> 	if (ret)
> 		return ret;

> 	ret = rt5651_apply_properties(codec);
> 	if (ret)
> 		return ret;

> Which makes the ordering really clear without needing any
> comments.

It's still unusual to have something outside the driver trigger property
parsing, though the EXPORT_SYMBOL_GPL() would make that apparent.

> This will also make the jack-detect device-properties work with
> devicetree platforms without any changes to their platform code,
> which currently is not the case since the non Intel platform-code
> does not call snd_soc_component_set_jack().

What makes you claim that?  Any board with jack detection wired up will
call that function.  Not all boards have that configured of course but
there's absolutely nothing Intel specific about that interface.

> Thinking more about this I believe that doing the
> snd_soc_card_jack_new() call inside the codec driver based on
> device-properties is a better solution then doing it in the
> machine driver.

No, that's really not a good idea.  Any jacks in the system are part of
the system specific wiring, they're not something that's intrinsic to
the CODEC.  Even with fairly basic setups you've got options like having
a headset jack or separate microphone and headphone jacks.
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