ASoC: rsnd: add SSIU BUSIF support

Gen2 has BUSIF0-3, Gen3 has BUSIF0-7 on some SSIU.
Current driver is assuming it is using BUSIF0 as default.
Thus, SSI is attaching SSIU (with BUSIF0) by using rsnd_ssiu_attach().
But, TDM split mode also needs other BUSIF to use it.
This patch adds missing SSIU BUSIFx support.

BUSIF is handled by SSIU instead of SSI anymore.
Thus, its settings no longer needed on SSI node on DT.
This patch removes its settings from Document, but driver is still
keeping compatibility. Thus, old DT style is still working.
But, to avoid confusing, it doesn't indicate old compatibility things on
Document. New SoC should have SSIU on DT from this patch.

1) old style DT is still supported (= no rcar_sound,ssiu node on DT)
2) If ssiu is not indicated on playback/capture,
   BUSIF0 will be used as default
	playback = <&ssi3>; /* ssiu30 will be selected */
3) you can select own ssiu
	playback = <&ssi32 &ssi3>; /* ssiu32 will be selected */

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

1 files changed, 12 insertions, 10 deletions

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index e91d3c942ea0..940a7ac69af1 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -134,11 +134,6 @@ int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 	return use_busif;
 }
 
-int rsnd_ssi_get_busif(struct rsnd_dai_stream *io)
-{
-	return 0; /* BUSIF0 only for now */
-}
-
 static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
 {
 	rsnd_mod_write(mod, SSISR, 0);
@@ -745,7 +740,7 @@ static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 {
 	struct device *dev = rsnd_priv_to_dev(priv);
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
-	int ret;
+	int ret = 0;
 
 	/*
 	 * SSIP/SSIU/IRQ are not needed on
@@ -759,10 +754,6 @@ static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 	 * see rsnd_ssi_pcm_new()
 	 */
 
-	ret = rsnd_ssiu_attach(io, mod);
-	if (ret < 0)
-		return ret;
-
 	/*
 	 * SSI might be called again as PIO fallback
 	 * It is easy to manual handling for IRQ request/free
@@ -956,6 +947,17 @@ static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 	int is_play = rsnd_io_is_play(io);
 	char *name;
 
+	/*
+	 * It should use "rcar_sound,ssiu" on DT.
+	 * But, 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.
+	 * see
+	 *	rsnd_ssiu_dma_req()
+	 *	rsnd_dma_of_path()
+	 */
+
 	if (rsnd_ssi_use_busif(io))
 		name = is_play ? "rxu" : "txu";
 	else