[alsa-devel] Applied "ASoC: sgtl5000: add multi endpoint support" to the asoc tree

[Mark Brown]

The patch

   ASoC: sgtl5000: add multi endpoint support

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.6

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 06bf8ea4f8ae34f91e60d27c8065f55d7a88c682 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex at denx.de>
Date: Thu, 19 Dec 2019 22:32:19 +0100
Subject: [PATCH] ASoC: sgtl5000: add multi endpoint support

Support multiple endpoints on SGTL5000 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 SGTL5000 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 (SGTL5000)
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:
sgtl5000_port: port {
    sgtl5000_tx_endpoint: endpoint at 0 {
	    remote-endpoint = <&sai2a_endpoint>;
    };
    sgtl5000_rx_endpoint: endpoint at 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 at denx.de>
Cc: Mark Brown <broonie at kernel.org>
Link: https://lore.kernel.org/r/20191219213219.366073-1-marex@denx.de
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/codecs/sgtl5000.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index e949b372cead..d5130193b4a2 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1514,6 +1514,13 @@ static int sgtl5000_probe(struct snd_soc_component *component)
 	return ret;
 }
 
+static int sgtl5000_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 sgtl5000_driver = {
 	.probe			= sgtl5000_probe,
 	.set_bias_level		= sgtl5000_set_bias_level,
@@ -1523,6 +1530,7 @@ static const struct snd_soc_component_driver sgtl5000_driver = {
 	.num_dapm_widgets	= ARRAY_SIZE(sgtl5000_dapm_widgets),
 	.dapm_routes		= sgtl5000_dapm_routes,
 	.num_dapm_routes	= ARRAY_SIZE(sgtl5000_dapm_routes),
+	.of_xlate_dai_id	= sgtl5000_of_xlate_dai_id,
 	.suspend_bias_off	= 1,
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,
-- 
2.20.1