[PATCH] drm/bridge: sii902x: add audio graph card support

[Philippe CORNU]

Hi Olivier,
and many thanks for your patch.
Good to have the audio graph card support, looks ok.
Reviewed-by: Philippe Cornu <philippe.cornu at st.com>
Philippe :-)

On 7/3/19 10:04 AM, Olivier Moysan wrote:
> 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 at 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,
>