ASoC: core: Allow codec_conf DT lookups to match parent of_node

For devices implemented as a MFD it is common to only have a single node
in devicetree representing the whole device. As such when looking up
codec_conf mappings we should match against both the devices of_node and
the devices parent's of_node, as is already done for DAIs and platform
components.
Signed-off-by: NCharles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -1383,7 +1383,12 @@ static void soc_set_name_prefix(struct snd_soc_card *card,
 
 	for (i = 0; i < card->num_configs; i++) {
 		struct snd_soc_codec_conf *map = &card->codec_conf[i];
-		if (map->of_node && component->dev->of_node != map->of_node)
+		struct device_node *component_of_node = component->dev->of_node;
+
+		if (!component_of_node && component->dev->parent)
+			component_of_node = component->dev->parent->of_node;
+
+		if (map->of_node && component_of_node != map->of_node)
 			continue;
 		if (map->dev_name && strcmp(component->name, map->dev_name))
 			continue;