[PATCH] ASoC: add helper to change platform name for all dailinks

[Pierre-Louis Bossart]

To reuse the same machine drivers with Atom/SST, Skylake and SOF, we
need to change the default platform_name (or platforms->name in the
"modern" representation).

So far, this override was done with an automatic override, which was
broken by a set of changes for DT platforms related to deferred probe
handling.

This automatic override is actually not really needed, the machine
driver can already receive the platform name as a platform_data
parameter. This is used e.g. for HDaudio support where we have
different PCI aliases used for different platforms. We can reuse the
same mechanism and modify the machine drivers to override the dailinks
prior to registrating the card.

This will require additional work for SOF, but with this helper it'll
be just two lines of additional code per machine driver which is
reused, not the end of the world.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
 include/sound/soc.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index b71b05019c68..59873084f3bd 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1583,6 +1583,29 @@ struct snd_soc_dai *snd_soc_card_get_codec_dai(struct snd_soc_card *card,
 	return NULL;
 }
 
+static inline
+int snd_soc_fixup_dai_links_platform_name(struct snd_soc_card *card,
+					  const char *platform_name)
+{
+	struct snd_soc_dai_link *dai_link;
+	int i;
+
+	if (!platform_name) /* nothing to do */
+		return 0;
+
+	/* set platform name for each dailink */
+	for_each_card_prelinks(card, i, dai_link) {
+		/* only single platform is supported for now */
+		dai_link->platforms->name = devm_kstrdup(card->dev,
+							 platform_name,
+							 GFP_KERNEL);
+		if (!dai_link->platforms->name)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_DEBUG_FS
 extern struct dentry *snd_soc_debugfs_root;
 #endif
-- 
2.17.1


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