[alsa-devel] [PATCH 4/4 v6] ASoC: simple-card: add Device Tree support
lars at metafoo.de
Wed Feb 20 13:17:57 CET 2013
On 02/20/2013 01:48 AM, Kuninori Morimoto wrote:
> Hi Lars
> Thank you for checking patch
>>> +- simple-audio,dev : phandle and port for CPU/CODEC
>>> +- simple-audio,frame-master : frame master
>>> +- simple-audio,bitclock-master : bitclock master
>>> +#sound-dai-cells integer is required on simple-audio,dev phandle's node
>> Shouldn't the names of '#sound-dai-cells' and 'simple-audio,dev' kind of
>> match? E.g. '#sound-dai-cells' and 'sound-dai'. Maybe drop the sound, since
>> the a in dai kind of implies this.
> Thank you, but I would like to keep "simple-audio" name for it too.
> So, can I use
The requirement to be able to find the DAI via devicetree is not specific to
the simple-audio driver. I'd prefer if we could come up with a common
binding which can be used by multiple drivers. Since you also add the xlate
(or match) function to the sound core it makes sense - in my option - to
also have a generic phandle -> DAI look-up method in the core.
>>> +static struct device_node*
>>> +__asoc_simple_card_parse_of(struct device_node *np,
>>> + struct asoc_simple_dai *dai)
>>> + struct device_node *node;
>>> + char prop;
>>> + /* get "simple-audio,dev = <&phandle port>" */
>>> + snprintf(prop, sizeof(prop), "simple-audio,dev");
>> Why do you need the extra buffer? Can you just pass, "simple-audio,dev"
>> directly to of_parse_phandle?
> Indeed, thank you.
>>> + node = of_parse_phandle(np, prop, 0);
>>> + if (!node)
>>> + return NULL;
>>> + of_node_put(node);
>> You shouldn't drop the reference until you are done processing it. Which in
>> this case is only after the device has been unregistered, since you pass the
>> node on to the ASoC core.
> I see, will fix
> Best regards
> Kuninori Morimoto
> Alsa-devel mailing list
> Alsa-devel at alsa-project.org
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