ASoC: fsl-asoc-card: merge spdif support from imx-spdif.c

The imx-spdif machine driver creates audio card to directly use an
S/PDIF device. However, it doesn't support interacting with an ASRC.
fsl-asoc-card already has the support to create audio card which can
use the ASRC.

Merge the S/PDIF support from imx-spdif into driver fsl-asoc-card
to extend the support of S/PDIF audio card with the use of ASRC devices.

fsl-asoc-card uses slightly different DT properties than imx-spdif:
* the "spdif-controller" property from imx-spdif is named "audio-cpu" in
  fsl-asoc-card.
* fsl-asoc-card uses codecs explicitly declared in DT
  with "audio-codec".
  With an SPDIF, codec drivers spdif_transmitter and
  spdif_receiver should be used.
  Driver imx-spdif used instead the dummy codec and a pair of
  boolean properties, "spdif-in" and "spdif-out".

To keep backward compatibility, support for "spdif-controller",
"spdif-in" and "spdif-out" is also added to fsl-asoc-card.
However, it is recommended to use the new properties if possible.
It is better to declare transmitter and/or receiver in DT
than using the dummy codec.

DTs using compatible "fsl,imx-audio-spdif" are still compatible, and
fsl-asoc-card will behave the same as imx-spdif
for these DTs.

Signed-off-by: Elinor Montmasson <elinor.montmasson@savoirfairelinux.com>
Link: https://patch.msgid.link/20240627083104.123357-5-elinor.montmasson@savoirfairelinux.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 0 insertions, 103 deletions

diff --git a/sound/soc/fsl/imx-spdif.c b/sound/soc/fsl/imx-spdif.c
deleted file mode 100644
index 1e57939a7e29..000000000000
--- a/sound/soc/fsl/imx-spdif.c
+++ /dev/null
@@ -1,103 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-//
-// Copyright (C) 2013 Freescale Semiconductor, Inc.
-
-#include <linux/module.h>
-#include <linux/of_platform.h>
-#include <sound/soc.h>
-
-struct imx_spdif_data {
-	struct snd_soc_dai_link dai;
-	struct snd_soc_card card;
-};
-
-static int imx_spdif_audio_probe(struct platform_device *pdev)
-{
-	struct device_node *spdif_np, *np = pdev->dev.of_node;
-	struct imx_spdif_data *data;
-	struct snd_soc_dai_link_component *comp;
-	int ret = 0;
-
-	spdif_np = of_parse_phandle(np, "spdif-controller", 0);
-	if (!spdif_np) {
-		dev_err(&pdev->dev, "failed to find spdif-controller\n");
-		ret = -EINVAL;
-		goto end;
-	}
-
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
-	comp = devm_kzalloc(&pdev->dev, sizeof(*comp), GFP_KERNEL);
-	if (!data || !comp) {
-		ret = -ENOMEM;
-		goto end;
-	}
-
-	/*
-	 * CPU == Platform
-	 * platform is using soc-generic-dmaengine-pcm
-	 */
-	data->dai.cpus		=
-	data->dai.platforms	= comp;
-	data->dai.codecs	= &snd_soc_dummy_dlc;
-
-	data->dai.num_cpus	= 1;
-	data->dai.num_codecs	= 1;
-	data->dai.num_platforms	= 1;
-
-	data->dai.name = "S/PDIF PCM";
-	data->dai.stream_name = "S/PDIF PCM";
-	data->dai.cpus->of_node = spdif_np;
-	data->dai.playback_only = true;
-	data->dai.capture_only = true;
-
-	if (of_property_read_bool(np, "spdif-out"))
-		data->dai.capture_only = false;
-
-	if (of_property_read_bool(np, "spdif-in"))
-		data->dai.playback_only = false;
-
-	if (data->dai.playback_only && data->dai.capture_only) {
-		dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
-		goto end;
-	}
-
-	data->card.dev = &pdev->dev;
-	data->card.dai_link = &data->dai;
-	data->card.num_links = 1;
-	data->card.owner = THIS_MODULE;
-
-	ret = snd_soc_of_parse_card_name(&data->card, "model");
-	if (ret)
-		goto end;
-
-	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
-	if (ret)
-		dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
-
-end:
-	of_node_put(spdif_np);
-
-	return ret;
-}
-
-static const struct of_device_id imx_spdif_dt_ids[] = {
-	{ .compatible = "fsl,imx-audio-spdif", },
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
-
-static struct platform_driver imx_spdif_driver = {
-	.driver = {
-		.name = "imx-spdif",
-		.pm = &snd_soc_pm_ops,
-		.of_match_table = imx_spdif_dt_ids,
-	},
-	.probe = imx_spdif_audio_probe,
-};
-
-module_platform_driver(imx_spdif_driver);
-
-MODULE_AUTHOR("Freescale Semiconductor, Inc.");
-MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:imx-spdif");