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ASoC: Introduce snd_soc_of_get_dai_link_cpus

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This function is an analogue of snd_soc_of_get_dai_link_codecs to help
machine drivers read CPU DAI lists from devicetrees.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220331000449.41062-5-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Martin Povišer 2022-03-31 02:04:48 +02:00 committed by Mark Brown
parent 1a8ee4cf84
commit 900dedd7e4
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2 changed files with 84 additions and 0 deletions
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4
include/sound/soc.h
View file

@ -1263,6 +1263,10 @@ int snd_soc_of_get_dai_link_codecs(struct device *dev,
struct device_node *of_node,
struct snd_soc_dai_link *dai_link);
void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link);
int snd_soc_of_get_dai_link_cpus(struct device *dev,
struct device_node *of_node,
struct snd_soc_dai_link *dai_link);
void snd_soc_of_put_dai_link_cpus(struct snd_soc_dai_link *dai_link);
int snd_soc_add_pcm_runtime(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link);

80
sound/soc/soc-core.c
View file

@ -3390,6 +3390,86 @@ int snd_soc_of_get_dai_link_codecs(struct device *dev,
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);
/*
* snd_soc_of_put_dai_link_cpus - Dereference device nodes in the codecs array
* @dai_link: DAI link
*
* Dereference device nodes acquired by snd_soc_of_get_dai_link_cpus().
*/
void snd_soc_of_put_dai_link_cpus(struct snd_soc_dai_link *dai_link)
{
struct snd_soc_dai_link_component *component;
int index;
for_each_link_cpus(dai_link, index, component) {
if (!component->of_node)
break;
of_node_put(component->of_node);
component->of_node = NULL;
}
}
EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_cpus);
/*
* snd_soc_of_get_dai_link_cpus - Parse a list of CPU DAIs in the devicetree
* @dev: Card device
* @of_node: Device node
* @dai_link: DAI link
*
* Is analogous to snd_soc_of_get_dai_link_codecs but parses a list of CPU DAIs
* instead.
*
* Returns 0 for success
*/
int snd_soc_of_get_dai_link_cpus(struct device *dev,
struct device_node *of_node,
struct snd_soc_dai_link *dai_link)
{
struct of_phandle_args args;
struct snd_soc_dai_link_component *component;
char *name;
int index, num_codecs, ret;
/* Count the number of CODECs */
name = "sound-dai";
num_codecs = of_count_phandle_with_args(of_node, name,
"#sound-dai-cells");
if (num_codecs <= 0) {
if (num_codecs == -ENOENT)
dev_err(dev, "No 'sound-dai' property\n");
else
dev_err(dev, "Bad phandle in 'sound-dai'\n");
return num_codecs;
}
component = devm_kcalloc(dev,
num_codecs, sizeof(*component),
GFP_KERNEL);
if (!component)
return -ENOMEM;
dai_link->cpus = component;
dai_link->num_cpus = num_codecs;
/* Parse the list */
for_each_link_cpus(dai_link, index, component) {
ret = of_parse_phandle_with_args(of_node, name,
"#sound-dai-cells",
index, &args);
if (ret)
goto err;
component->of_node = args.np;
ret = snd_soc_get_dai_name(&args, &component->dai_name);
if (ret < 0)
goto err;
}
return 0;
err:
snd_soc_of_put_dai_link_codecs(dai_link);
dai_link->cpus = NULL;
dai_link->num_cpus = 0;
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_cpus);
static int __init snd_soc_init(void)
{
snd_soc_debugfs_init();