ASoC: tlv320aic32x4: Add multi endpoint support

Support multiple endpoints on TLV320AIC32x4 codec port when
used in of_graph context.

This patch allows to share the codec port between two CPU DAIs.

Example:

Custom STM32MP157C board uses TLV320AIC32x4 audio codec. This codec
is connected to two serial audio interfaces, which are configured
either as rx or tx.

>From AsoC point of view the topolgy is the following:
// 2 CPU DAIs (SAI2A/B), 1 Codec (TLV320AIC32x4)
Playback: CPU-A-DAI(slave) -> (master)CODEC-DAI/port0
Record:   CPU-B-DAI(slave) <- (master)CODEC-DAI/port0

In the DT two endpoints have to be associated to the codec port:
tlv320aic32x4_port: port {
    tlv320aic32x4_tx_endpoint: endpoint@0 {
            remote-endpoint = <&sai2a_endpoint>;
    };
    tlv320aic32x4_rx_endpoint: endpoint@1 {
            remote-endpoint = <&sai2b_endpoint>;
    };
};

However, when the audio graph card parses the codec nodes, it expects
to find DAI interface indexes matching the endpoints indexes.

The current patch forces the use of DAI id 0 for both endpoints,
which allows to share the codec DAI between the two CPU DAIs
for playback and capture streams respectively.
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20240830231007.205707-1-marex@denx.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tlv320aic32x4.c

@@ -1073,6 +1073,13 @@ static int aic32x4_component_probe(struct snd_soc_component *component)
 	return 0;
 }
 
+static int aic32x4_of_xlate_dai_id(struct snd_soc_component *component,
+				   struct device_node *endpoint)
+{
+	/* return dai id 0, whatever the endpoint index */
+	return 0;
+}
+
 static const struct snd_soc_component_driver soc_component_dev_aic32x4 = {
 	.probe			= aic32x4_component_probe,
 	.set_bias_level		= aic32x4_set_bias_level,
@@ -1082,6 +1089,7 @@ static const struct snd_soc_component_driver soc_component_dev_aic32x4 = {
 	.num_dapm_widgets	= ARRAY_SIZE(aic32x4_dapm_widgets),
 	.dapm_routes		= aic32x4_dapm_routes,
 	.num_dapm_routes	= ARRAY_SIZE(aic32x4_dapm_routes),
+	.of_xlate_dai_id	= aic32x4_of_xlate_dai_id,
 	.suspend_bias_off	= 1,
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,
@@ -1203,6 +1211,7 @@ static const struct snd_soc_component_driver soc_component_dev_aic32x4_tas2505 =
 	.num_dapm_widgets	= ARRAY_SIZE(aic32x4_tas2505_dapm_widgets),
 	.dapm_routes		= aic32x4_tas2505_dapm_routes,
 	.num_dapm_routes	= ARRAY_SIZE(aic32x4_tas2505_dapm_routes),
+	.of_xlate_dai_id	= aic32x4_of_xlate_dai_id,
 	.suspend_bias_off	= 1,
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,