[PATCH v2 10/29] ASoC: tas2764: Configure zeroing of SDOUT slots

[James Calligeros <jcalligeros99@gmail.com>]

From: Martin Povišer <povik+lin@cutebit.org>

The codec has an option to zero out certain TDM slots on its SDOUT
output according to a preconfigured mask (otherwise the output is, for
the duration of unused slots, in a Hi-Z state). Configure this feature
based on a mask read from the devicetree.

Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
 sound/soc/codecs/tas2764.c | 23 +++++++++++++++++++++++
 sound/soc/codecs/tas2764.h | 11 +++++++++++
 2 files changed, 34 insertions(+)

diff --git a/sound/soc/codecs/tas2764.c b/sound/soc/codecs/tas2764.c
index e4003a724c8c09303882ee36fc11133cf5c78b57..a2b7d0352d4f636c2bf7185715c0f1143ba8150e 100644
--- a/sound/soc/codecs/tas2764.c
+++ b/sound/soc/codecs/tas2764.c
@@ -40,6 +40,7 @@ struct tas2764_priv {
 
 	int v_sense_slot;
 	int i_sense_slot;
+	u32 sdout_zero_mask;
 
 	bool dac_powered;
 	bool unmuted;
@@ -594,6 +595,23 @@ static int tas2764_codec_probe(struct snd_soc_component *component)
 	if (ret < 0)
 		return ret;
 
+	if (tas2764->sdout_zero_mask) {
+		for (i = 0; i < 4; i++) {
+			ret = snd_soc_component_write(component, TAS2764_SDOUT_HIZ_1 + i,
+						      (tas2764->sdout_zero_mask >> (i * 8)) & 0xff);
+
+			if (ret < 0)
+				return ret;
+		}
+
+		ret = snd_soc_component_update_bits(component, TAS2764_SDOUT_HIZ_9,
+						    TAS2764_SDOUT_HIZ_9_FORCE_0_EN,
+						    TAS2764_SDOUT_HIZ_9_FORCE_0_EN);
+
+		if (ret < 0)
+			return ret;
+	}
+
 	if (tas2764->devid == DEVID_SN012776) {
 		ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 					TAS2764_PWR_CTRL_BOP_SRC,
@@ -736,6 +754,11 @@ static int tas2764_parse_dt(struct device *dev, struct tas2764_priv *tas2764)
 	if (ret)
 		tas2764->v_sense_slot = 2;
 
+	ret = fwnode_property_read_u32(dev->fwnode, "ti,sdout-force-zero-mask",
+				       &tas2764->sdout_zero_mask);
+	if (ret)
+		tas2764->sdout_zero_mask = 0;
+
 	return 0;
 }
 
diff --git a/sound/soc/codecs/tas2764.h b/sound/soc/codecs/tas2764.h
index b814715b41ff6e9a714c30ae204e7792351428b6..00296b8b1f7584e7520bd6ed749a09681f16ea09 100644
--- a/sound/soc/codecs/tas2764.h
+++ b/sound/soc/codecs/tas2764.h
@@ -117,4 +117,15 @@
 
 #define TAS2764_BOP_CFG0                TAS2764_REG(0X0, 0x1d)
 
+#define TAS2764_SDOUT_HIZ_1		TAS2764_REG(0x1, 0x3d)
+#define TAS2764_SDOUT_HIZ_2		TAS2764_REG(0x1, 0x3e)
+#define TAS2764_SDOUT_HIZ_3		TAS2764_REG(0x1, 0x3f)
+#define TAS2764_SDOUT_HIZ_4		TAS2764_REG(0x1, 0x40)
+#define TAS2764_SDOUT_HIZ_5		TAS2764_REG(0x1, 0x41)
+#define TAS2764_SDOUT_HIZ_6		TAS2764_REG(0x1, 0x42)
+#define TAS2764_SDOUT_HIZ_7		TAS2764_REG(0x1, 0x43)
+#define TAS2764_SDOUT_HIZ_8		TAS2764_REG(0x1, 0x44)
+#define TAS2764_SDOUT_HIZ_9		TAS2764_REG(0x1, 0x45)
+#define TAS2764_SDOUT_HIZ_9_FORCE_0_EN	BIT(7)
+
 #endif /* __TAS2764__ */

-- 
2.48.1