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Subject[PATCH] drm/bridge: sii902x: add audio graph card support
Date
Implement get_dai_id callback of audio HDMI codec
to support ASoC audio graph card.
HDMI audio output has to be connected to sii902x port 3.
get_dai_id callback maps this port to ASoC DAI index 0.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
drivers/gpu/drm/bridge/sii902x.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index dd7aa466b280..daf9ef3cd817 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -158,6 +158,8 @@

#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500

+#define SII902X_AUDIO_PORT_INDEX 3
+
struct sii902x {
struct i2c_client *i2c;
struct regmap *regmap;
@@ -690,11 +692,32 @@ static int sii902x_audio_get_eld(struct device *dev, void *data,
return 0;
}

+static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
+ struct device_node *endpoint)
+{
+ struct of_endpoint of_ep;
+ int ret;
+
+ ret = of_graph_parse_endpoint(endpoint, &of_ep);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * HDMI sound should be located at reg = <3>
+ * Return expected DAI index 0.
+ */
+ if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
+ return 0;
+
+ return -EINVAL;
+}
+
static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
.hw_params = sii902x_audio_hw_params,
.audio_shutdown = sii902x_audio_shutdown,
.digital_mute = sii902x_audio_digital_mute,
.get_eld = sii902x_audio_get_eld,
+ .get_dai_id = sii902x_audio_get_dai_id,
};

static int sii902x_audio_codec_init(struct sii902x *sii902x,
--
2.7.4
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