[PATCH v4 05/10] ASoC: soc-core: Add snd_soc_of_xlate_dai_name() generic helper

[Harendra Gautam]

Some ASoC CPU DAI drivers need to resolve a sound-dai phandle argument
to a DAI name by matching the argument against the component's DAI IDs.
lpass-cpu carries a local implementation of this lookup.

Add snd_soc_of_xlate_dai_name() to soc-core.c as a generic helper
that can be assigned directly to the .of_xlate_dai_name component
driver callback. It iterates the component's DAI list using
for_each_component_dais() and matches by DAI ID.

Signed-off-by: Harendra Gautam <harendra.gautam@xxxxxxxxxxxxxxxx>
---
 include/sound/soc.h  |  3 +++
 sound/soc/soc-core.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index f46b2bc2a022..b772273b7183 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1330,6 +1330,9 @@ int snd_soc_of_parse_tdm_slot(struct device_node *np,
 			      unsigned int *rx_mask,
 			      unsigned int *slots,
 			      unsigned int *slot_width);
+int snd_soc_of_xlate_dai_name(struct snd_soc_component *component,
+			      const struct of_phandle_args *args,
+			      const char **dai_name);
 void snd_soc_of_parse_node_prefix(struct device_node *np,
 				   struct snd_soc_codec_conf *codec_conf,
 				   struct device_node *of_node,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index b9c70268d49f..42c57c24ab70 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3053,6 +3053,39 @@ int snd_soc_of_parse_tdm_slot(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);
 
+/**
+ * snd_soc_of_xlate_dai_name - Resolve a sound-dai phandle argument to a
+ *                             DAI name by searching the component DAI list.
+ * @component: ASoC component to search.
+ * @args:      Phandle arguments from the sound-dai property; args[0] is the
+ *             DAI ID.
+ * @dai_name:  Output pointer set to the matched DAI name on success.
+ *
+ * Return: 0 on success, -EINVAL if args_count != 1 or no match is found.
+ */
+int snd_soc_of_xlate_dai_name(struct snd_soc_component *component,
+			      const struct of_phandle_args *args,
+			      const char **dai_name)
+{
+	struct snd_soc_dai *dai;
+	int id;
+
+	if (args->args_count != 1)
+		return -EINVAL;
+
+	id = args->args[0];
+
+	for_each_component_dais(component, dai) {
+		if (dai->driver->id == id) {
+			*dai_name = snd_soc_dai_name_get(dai);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_xlate_dai_name);
+
 void snd_soc_dlc_use_cpu_as_platform(struct snd_soc_dai_link_component *platforms,
 				     struct snd_soc_dai_link_component *cpus)
 {
-- 
2.34.1