drm/bridge: sii902x: add audio graph card support

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>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Acked-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1562141052-26221-1-git-send-email-olivier.moysan@st.com

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index a323815aa9b623a72758c84a207abb5f6b9d8d62..38f75ac580df48ad47deff264eb4467b6d06b1ba 100644 (file)
--- 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;
@@ -692,11 +694,32 @@ 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,