ASoC: rsnd: add TDM Split mode support

This patch adds TDM Split mode support. rsnd driver is assuming
audio-graph-scu-card is used for Sound Card.

This is very simple sample DT settings to use it.

	sound_card: sound {
		compatible = "audio-graph-scu-card";
		...
		convert-channels = <8>; /* TDM Split */

		dais = <&rsnd_port0     /* playback ch1/ch2 */
			&rsnd_port1     /* playback ch3/ch4 */
			&rsnd_port2     /* playback ch5/ch6 */
			&rsnd_port3     /* playback ch7/ch8 */
			>;
	};

	audio-codec {
		...
		port {
			codec_0: endpoint@1 {
				remote-endpoint = <&rsnd_ep0>;
			};
			codec_1: endpoint@2 {
				remote-endpoint = <&rsnd_ep1>;
			};
			codec_2: endpoint@3 {
				remote-endpoint = <&rsnd_ep2>;
			};
			codec_3: endpoint@4 {
				remote-endpoint = <&rsnd_ep3>;
			};
		};
	};

	&rcar_sound {
		...
		ports {
			rsnd_port0: port@0 {
				rsnd_ep0: endpoint {
					remote-endpoint = <&codec_0>;
					...
					playback = <&ssiu30 &ssi3>;
				};
			};
			rsnd_port1: port@1 {
				rsnd_ep1: endpoint {
					remote-endpoint = <&codec_1>;
					...
					playback = <&ssiu31 &ssi3>;
				};
			};
			rsnd_port2: port@2 {
				rsnd_ep2: endpoint {
					remote-endpoint = <&codec_2>;
					...
					playback = <&ssiu32 &ssi3>;
				};
			};
			rsnd_port3: port@3 {
				rsnd_ep3: endpoint {
					remote-endpoint = <&codec_3>;
					...
					playback = <&ssiu33 &ssi3>;
				};
			};
		};
	};

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

1 files changed, 13 insertions, 8 deletions

diff --git a/sound/soc/sh/rcar/ssiu.c b/sound/soc/sh/rcar/ssiu.c
index 0609a0c5f9f9..650b14e99b05 100644
--- a/sound/soc/sh/rcar/ssiu.c
+++ b/sound/soc/sh/rcar/ssiu.c
@@ -16,6 +16,10 @@ struct rsnd_ssiu {
 	int id_sub;
 };
 
+/* SSI_MODE */
+#define TDM_EXT		(1 << 0)
+#define TDM_SPLIT	(1 << 8)
+
 #define rsnd_ssiu_nr(priv) ((priv)->ssiu_nr)
 #define rsnd_mod_to_ssiu(_mod) container_of((_mod), struct rsnd_ssiu, mod)
 #define for_each_rsnd_ssiu(pos, priv, i)				\
@@ -165,14 +169,15 @@ static int rsnd_ssiu_init_gen2(struct rsnd_mod *mod,
 
 	ssiu->usrcnt++;
 
-	if (rsnd_runtime_is_tdm(io)) {
-		/*
-		 * TDM Extend Mode
-		 * see
-		 *	rsnd_ssi_config_init()
-		 */
-		mode = 0x1;
-	}
+	/*
+	 * TDM Extend/Split Mode
+	 * see
+	 *	rsnd_ssi_config_init()
+	 */
+	if (rsnd_runtime_is_tdm(io))
+		mode = TDM_EXT;
+	else if (rsnd_runtime_is_tdm_split(io))
+		mode = TDM_SPLIT;
 
 	rsnd_mod_write(mod, SSI_MODE, mode);