[PATCH v5 13/14] ASoC: rsnd: Support unprefixed DT node names for RZ/G3E

[John Madieu <john.madieu@gmail.com>]

The RZ/G3E device tree binding uses standard unprefixed node names
('ssi', 'ssiu', 'src', 'dvc', 'mix', 'ctu', 'dai') instead of the
legacy 'rcar_sound,' prefixed names used by R-Car bindings.

Convert rsnd_parse_of_node() from a macro into a function that tries
the legacy prefixed name first, then falls back to the unprefixed
name by stripping the "rcar_sound," prefix. This makes the driver
work transparently with both old and new bindings.

While at it, update the of_node_name_eq() calls in core.c which compare
against RSND_NODE_DAI directly (bypassing rsnd_parse_of_node()),
and fix the related comments in ssiu.c, ssi.c, and dma.c that
reference hardcoded "rcar_sound,ssiu" / "rcar_sound,ssi" names.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
---

Changes:

v5: New patch.

 sound/soc/renesas/rcar/core.c | 27 +++++++++++++++++++++++++--
 sound/soc/renesas/rcar/dma.c  |  8 ++++----
 sound/soc/renesas/rcar/rsnd.h |  4 ++--
 sound/soc/renesas/rcar/ssi.c  |  8 ++++----
 sound/soc/renesas/rcar/ssiu.c |  8 ++++----
 5 files changed, 39 insertions(+), 16 deletions(-)

diff --git a/sound/soc/renesas/rcar/core.c b/sound/soc/renesas/rcar/core.c
index cb31af8a34d4..93cacac1c98a 100644
--- a/sound/soc/renesas/rcar/core.c
+++ b/sound/soc/renesas/rcar/core.c
@@ -1235,6 +1235,27 @@ int rsnd_node_count(struct rsnd_priv *priv, struct device_node *node, char *name
 	return i;
 }
 
+struct device_node *rsnd_parse_of_node(struct rsnd_priv *priv, const char *name)
+{
+	struct device_node *np = rsnd_priv_to_dev(priv)->of_node;
+	struct device_node *node;
+	const char *unprefixed;
+
+	node = of_get_child_by_name(np, name);
+	if (node)
+		return node;
+
+	/*
+	 * RZ/G3E binding uses unprefixed node names (e.g. "ssi" instead
+	 * of "rcar_sound,ssi"). Try stripping the "rcar_sound," prefix.
+	 */
+	unprefixed = strchr(name, ',');
+	if (unprefixed)
+		node = of_get_child_by_name(np, unprefixed + 1);
+
+	return node;
+}
+
 static struct device_node*
 	rsnd_pick_endpoint_node_for_ports(struct device_node *e_ports,
 					  struct device_node *e_port)
@@ -1273,7 +1294,8 @@ static int rsnd_dai_of_node(struct rsnd_priv *priv, int *is_graph)
 	of_node_put(node);
 
 	for_each_child_of_node_scoped(np, node) {
-		if (!of_node_name_eq(node, RSND_NODE_DAI))
+		if (!of_node_name_eq(node, RSND_NODE_DAI) &&
+		    !of_node_name_eq(node, "dai"))
 			continue;
 
 		priv->component_dais[i] = of_get_child_count(node);
@@ -1525,7 +1547,8 @@ static int rsnd_dai_probe(struct rsnd_priv *priv)
 		}
 	} else {
 		for_each_child_of_node_scoped(np, node) {
-			if (!of_node_name_eq(node, RSND_NODE_DAI))
+			if (!of_node_name_eq(node, RSND_NODE_DAI) &&
+			    !of_node_name_eq(node, "dai"))
 				continue;
 
 			for_each_child_of_node_scoped(node, dai_np) {
diff --git a/sound/soc/renesas/rcar/dma.c b/sound/soc/renesas/rcar/dma.c
index 71dfa23018a5..39f43e935cde 100644
--- a/sound/soc/renesas/rcar/dma.c
+++ b/sound/soc/renesas/rcar/dma.c
@@ -794,11 +794,11 @@ static void rsnd_dma_of_path(struct rsnd_mod *this,
 	int nr, i, idx;
 
 	/*
-	 * It should use "rcar_sound,ssiu" on DT.
-	 * But, we need to keep compatibility for old version.
+	 * It should use "rcar_sound,ssiu" (R-Car) or "ssiu" (RZ/G3E) on DT.
+	 * We need to keep compatibility for old version.
 	 *
-	 * If it has "rcar_sound.ssiu", it will be used.
-	 * If not, "rcar_sound.ssi" will be used.
+	 * If it has "rcar_sound.ssiu" or "ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" or "ssi" will be used.
 	 * see
 	 *	rsnd_ssiu_dma_req()
 	 *	rsnd_ssi_dma_req()
diff --git a/sound/soc/renesas/rcar/rsnd.h b/sound/soc/renesas/rcar/rsnd.h
index 70e395d3c6ef..0d2436beb718 100644
--- a/sound/soc/renesas/rcar/rsnd.h
+++ b/sound/soc/renesas/rcar/rsnd.h
@@ -482,8 +482,8 @@ int rsnd_runtime_is_tdm_split(struct rsnd_dai_stream *io);
 /*
  * DT
  */
-#define rsnd_parse_of_node(priv, node)					\
-	of_get_child_by_name(rsnd_priv_to_dev(priv)->of_node, node)
+struct device_node *rsnd_parse_of_node(struct rsnd_priv *priv, const char *name);
+
 #define RSND_NODE_DAI	"rcar_sound,dai"
 #define RSND_NODE_SSI	"rcar_sound,ssi"
 #define RSND_NODE_SSIU	"rcar_sound,ssiu"
diff --git a/sound/soc/renesas/rcar/ssi.c b/sound/soc/renesas/rcar/ssi.c
index c65435551283..c00c6f9f5c9d 100644
--- a/sound/soc/renesas/rcar/ssi.c
+++ b/sound/soc/renesas/rcar/ssi.c
@@ -1010,11 +1010,11 @@ static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 	char *name;
 
 	/*
-	 * It should use "rcar_sound,ssiu" on DT.
-	 * But, we need to keep compatibility for old version.
+	 * It should use "rcar_sound,ssiu" (R-Car) or "ssiu" (RZ/G3E) on DT.
+	 * We need to keep compatibility for old version.
 	 *
-	 * If it has "rcar_sound.ssiu", it will be used.
-	 * If not, "rcar_sound.ssi" will be used.
+	 * If it has "rcar_sound.ssiu" or "ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" or "ssi" will be used.
 	 * see
 	 *	rsnd_ssiu_dma_req()
 	 *	rsnd_dma_of_path()
diff --git a/sound/soc/renesas/rcar/ssiu.c b/sound/soc/renesas/rcar/ssiu.c
index f483389868d2..8fb0ec5dc791 100644
--- a/sound/soc/renesas/rcar/ssiu.c
+++ b/sound/soc/renesas/rcar/ssiu.c
@@ -401,11 +401,11 @@ static struct dma_chan *rsnd_ssiu_dma_req(struct rsnd_dai_stream *io,
 	char *name;
 
 	/*
-	 * It should use "rcar_sound,ssiu" on DT.
-	 * But, we need to keep compatibility for old version.
+	 * It should use "rcar_sound,ssiu" (R-Car) or "ssiu" (RZ/G3E) on DT.
+	 * We need to keep compatibility for old versions.
 	 *
-	 * If it has "rcar_sound.ssiu", it will be used.
-	 * If not, "rcar_sound.ssi" will be used.
+	 * If it has "rcar_sound.ssiu" or "ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" or "ssi" will be used.
 	 * see
 	 *	rsnd_ssi_dma_req()
 	 *	rsnd_dma_of_path()
-- 
2.25.1