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@xxxxxxxxxxx>
---
include/sound/soc.h | 4 +++
sound/soc/soc-core.c | 80 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 84 insertions(+)
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 0ab664500b8f..0bf9d1d0768c 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1266,6 +1266,10 @@ 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);
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 0bf05d98ec0d..a97476ec01ab 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3400,6 +3400,86 @@ 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();
--
2.33.0
