[alsa-devel] [PATCH] ASoC: rsnd: adg :: AUDIO-CLKOUTn can synchronizes with L/R clock.

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>

AUDIO-CLKOUTn can synchronizes with L/R clock, and Salvator board
needs it. Otherwise, specific frequency sound will be noisy.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
 .../devicetree/bindings/sound/renesas,rsnd.txt         |  2 ++
 sound/soc/sh/rcar/adg.c                                | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index c7b29df..065d9c8 100644
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -373,6 +373,8 @@ Optional properties:
 - #clock-cells			: it must be 0 if your system has audio_clkout
 				  it must be 1 if your system has audio_clkout0/1/2/3
 - clock-frequency		: for all audio_clkout0/1/2/3
+- clkout-lr-synchronous		: boolean property. it indicates that audio_clkoutn
+				  synchronizes with lr-clock.
 
 SSI subnode properties:
 - interrupts			: Should contain SSI interrupt for PIO transfer
diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c
index c4c51a4..1586271 100644
--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -33,11 +33,15 @@ struct rsnd_adg {
 	struct clk *clkout[CLKOUTMAX];
 	struct clk_onecell_data onecell;
 	struct rsnd_mod mod;
+	u32 flags;
 
 	int rbga_rate_for_441khz; /* RBGA */
 	int rbgb_rate_for_48khz;  /* RBGB */
 };
 
+#define LRCLK_SYNC	(1 << 0)
+#define adg_mode_flags(adg)	(adg->flags)
+
 #define for_each_rsnd_clk(pos, adg, i)		\
 	for (i = 0;				\
 	     (i < CLKMAX) &&			\
@@ -355,6 +359,16 @@ found_clock:
 
 	rsnd_adg_set_ssi_clk(ssi_mod, data);
 
+	if (adg_mode_flags(adg) & LRCLK_SYNC) {
+		struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
+		u32 ckr = 0;
+
+		if (0 == (rate % 8000))
+			ckr = 0x80000000;
+
+		rsnd_mod_bset(adg_mod, SSICKR, 0x80000000, ckr);
+	}
+
 	dev_dbg(dev, "ADG: %s[%d] selects 0x%x for %d\n",
 		rsnd_mod_name(ssi_mod), rsnd_mod_id(ssi_mod),
 		data, rate);
@@ -532,6 +546,7 @@ int rsnd_adg_probe(struct rsnd_priv *priv)
 {
 	struct rsnd_adg *adg;
 	struct device *dev = rsnd_priv_to_dev(priv);
+	struct device_node *np = dev->of_node;
 
 	adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL);
 	if (!adg) {
@@ -545,6 +560,9 @@ int rsnd_adg_probe(struct rsnd_priv *priv)
 	rsnd_adg_get_clkin(priv, adg);
 	rsnd_adg_get_clkout(priv, adg);
 
+	if (of_get_property(np, "clkout-lr-synchronous", NULL))
+		adg->flags = LRCLK_SYNC;
+
 	priv->adg = adg;
 
 	return 0;
-- 
1.9.1