ASoC: rsnd: dvc: add rsnd_dvc_of_node()

This patch adds rsnd_dvc_of_node() to get DVC subnode from DT.
This is prepare for new DT bindings for 1st DMAC

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/dvc.c b/sound/soc/sh/rcar/dvc.c
index d7f9ed959c4e..e0990180e1ea 100644
--- a/sound/soc/sh/rcar/dvc.c
+++ b/sound/soc/sh/rcar/dvc.c
@@ -24,6 +24,9 @@ struct rsnd_dvc {
         struct rsnd_kctrl_cfg_s rdown;  /* Ramp Rate Down */
 };
 
+#define rsnd_dvc_of_node(priv) \
+        of_get_child_by_name(rsnd_priv_to_dev(priv)->of_node, "rcar_sound,dvc")
+
 #define rsnd_mod_to_dvc(_mod)   \
         container_of((_mod), struct rsnd_dvc, mod)