Issues using simple-audio-card driver with Xilinx Audio Formatter

[Kuninori Morimoto]

Hi Robert

Thank you for your reporting

> asoc-simple-card irxs-audio: parse error -22
> asoc-simple-card: probe of irxs-audio failed with error -22
(snip)
> Inside snd_soc_get_dai_name, snd_soc_component_of_xlate_dai_name is called and
> returns -ENOTSUPP, so we fall into the if block and end up failing out here:
> 
> 			if (id < 0 || id >= pos->num_dai) {
> 				ret = -EINVAL;
> 				continue;
> 			}

Platform support was added to simple-audio-card by someone (I forgot detail),
and I have never use it unfortunately.
But in my quick check, the purpose of asoc_simple_parse_platform() is
setup dlc->of_node

	asoc_simple_parse_dai(...)
	{
		...
=>		dlc->of_node = args.np;
		...
	}

and it will be checked at asoc_simple_canonicalize_platform()

	asoc_simple_canonicalize_platform(...)
	{
		/* Assumes platform == cpu */
=>		if (!dai_link->platforms->of_node)
=>			dai_link->platforms->of_node = dai_link->cpus->of_node;
		...
	}

and will be used at soc-core

(A)	soc_dai_link_sanity_check(...)
	{
		...
		for_each_link_platforms(link, i, platform) {
=>			if (!!platform->name == !!platform->of_node) {
		...
	}

	snd_soc_add_pcm_runtime(...)
	{
		...
(A)		ret = soc_dai_link_sanity_check();
		...

		for_each_link_cpus(dai_link, i, cpu) {
(X)			asoc_rtd_to_cpu(rtd, i) = snd_soc_find_dai(cpu);
			...
		}

		for_each_link_codecs(dai_link, i, codec) {
(X)			asoc_rtd_to_codec(rtd, i) = snd_soc_find_dai(codec);
			...
		}

		for_each_link_platforms(dai_link, i, platform) {
(Y)			for_each_component(component) {
=>				if (!snd_soc_is_matching_component(platform, component))
		...
	}

But, at snd_soc_add_pcm_runtime(),
CPU/Codec needs of_node and DAI name (= X)
Platform  needs of_node              (= Y)

So maybe (I didn't confirm) for platform,
asoc_simple_parse_dai() don't need to call snd_soc_of_get_dai_name() ?

Thank you for your help !!

Best regards
---
Kuninori Morimoto