ASoC: Introduce snd_soc_of_get_dai_link_cpus

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>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 7a1650b..d3d3a26 100644 (file)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -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);

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index ce153ac..d8426df 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3390,6 +3390,86 @@ err:
 }
 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();