ASoC: rsnd: clarify scu.c area

scu.c cares SRU(Gen1) / SCU(Gen2) / SSIU(Gen2)

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

1 files changed, 14 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/scu.c b/sound/soc/sh/rcar/scu.c
index 076aa71bc102..1adc85825f4e 100644
--- a/sound/soc/sh/rcar/scu.c
+++ b/sound/soc/sh/rcar/scu.c
@@ -41,6 +41,20 @@ struct rsnd_scu {
  */
 
 /*
+ * scu.c is caring...
+ *
+ * Gen1
+ *
+ * [mem] -> [SRU] -> [SSI]
+ *        |--------|
+ *
+ * Gen2
+ *
+ * [mem] -> [SCU] -> [SSIU] -> [SSI]
+ *        |-----------------|
+ */
+
+/*
  *      How to use SRC bypass mode for debugging
  *
  * SRC has bypass mode, and it is useful for debugging.