ASoC: tlv320adcx140: Add the config to configure Tx ASI output

Add code to allow the ASI Tx output to be placed into High-z mode
during unused ASI cycles.  This allows for other devices that may be on
the bus to drive the ASI out. By default the 320adcx140 sends 0's for
unused cycles.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200915190606.1744-4-dmurphy@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index cf5cbe314f7e847bba50888cf3998311ccb9fb4b..28dbd7d5e1495d70cbb10ffb60a14d830dc5eec5 100644 (file)
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -876,6 +876,7 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
        u32 gpi_input_val = 0;
        int i;
        int ret;
+       bool tx_high_z;
 
        ret = device_property_read_u32(adcx140->dev, "ti,mic-bias-source",
                                      &bias_source);
@@ -967,6 +968,16 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
        if (ret)
                dev_err(adcx140->dev, "setting MIC bias failed %d\n", ret);
 
+       tx_high_z = device_property_read_bool(adcx140->dev, "ti,asi-tx-drive");
+       if (tx_high_z) {
+               ret = regmap_update_bits(adcx140->regmap, ADCX140_ASI_CFG0,
+                                ADCX140_TX_FILL, ADCX140_TX_FILL);
+               if (ret) {
+                       dev_err(adcx140->dev, "Setting Tx drive failed %d\n", ret);
+                       goto out;
+               }
+       }
+
        adcx140_pwr_ctrl(adcx140, true);
 out:
        return ret;

diff --git a/sound/soc/codecs/tlv320adcx140.h b/sound/soc/codecs/tlv320adcx140.h
index 94c6d1fd2977c7d1283a7e642ea85ba12caafeca..107bd7927d9ca4d6d85bb6fe1c99069df38a1297 100644 (file)
--- a/sound/soc/codecs/tlv320adcx140.h
+++ b/sound/soc/codecs/tlv320adcx140.h
@@ -146,5 +146,6 @@
 #define ADCX140_GPO_CFG_MAX            4
 #define ADCX140_GPO_DRV_MAX            5
 
+#define ADCX140_TX_FILL    BIT(0)
 
 #endif /* _TLV320ADCX140_ */