Support multiple endpoints on cs42L51 codec port
when used in of_graph context.
This patch allows to share the codec port between two CPU DAIs.
Example:
STM32MP157C-DK2 board uses CS42L51 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 (CS42L51)
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:
cs42l51_port: port {
cs42l51_tx_endpoint: endpoint@0 {
remote-endpoint = <&sai2a_endpoint>;
};
cs42l51_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: Olivier Moysan <olivier.moy...@st.com>
---
sound/soc/codecs/cs42l51.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index fd2bd74024c1..80da3cd73e04 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -464,6 +464,13 @@ static int cs42l51_dai_mute(struct snd_soc_dai *dai, int
mute)
return snd_soc_component_write(component, CS42L51_DAC_OUT_CTL, reg);
}
+static int cs42l51_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_dai_ops cs42l51_dai_ops = {
.hw_params = cs42l51_hw_params,
.set_sysclk = cs42l51_set_dai_sysclk,
@@ -526,6 +533,7 @@ static const struct snd_soc_component_driver
soc_component_device_cs42l51 = {
.num_dapm_widgets = ARRAY_SIZE(cs42l51_dapm_widgets),
.dapm_routes = cs42l51_routes,
.num_dapm_routes = ARRAY_SIZE(cs42l51_routes),
+ .of_xlate_dai_id = cs42l51_of_xlate_dai_id,
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
--
2.7.4
