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ASoC: mediatek: mt2701: add machine driver for on-chip HDMI codec

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Add a simple ASoC machine driver that wires the MT2701/MT7623N
AFE HDMI playback path to the on-chip HDMI transmitter exposed
as a generic hdmi-audio-codec "i2s-hifi" DAI.

The driver binds to "mediatek,mt2701-hdmi-audio". MT7623N device
trees carry "mediatek,mt7623n-hdmi-audio" as a board-specific
fallback, matching the dt-binding.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://patch.msgid.link/1dafc8147ee09d44de53b69bca792bdbfe13e8b0.1776998727.git.daniel@makrotopia.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Daniel Golle 2026-04-24 03:50:23 +01:00 committed by Mark Brown
parent 0e2f1d39c2
commit 4d9c6bbfed
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3 changed files with 125 additions and 0 deletions
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10
sound/soc/mediatek/Kconfig
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@ -26,6 +26,16 @@ config SND_SOC_MT2701_CS42448
Select Y if you have such device.
If unsure select "N".
config SND_SOC_MT2701_HDMI
tristate "ASoC Audio driver for MT2701 with on-chip HDMI codec"
depends on SND_SOC_MT2701
select SND_SOC_HDMI_CODEC
help
This adds the ASoC machine driver for MediaTek MT2701 and
MT7623N boards routing the AFE I2S back-end to the on-chip
HDMI transmitter via the generic HDMI codec.
If unsure select "N".
config SND_SOC_MT2701_WM8960
tristate "ASoc Audio driver for MT2701 with WM8960 codec"
depends on SND_SOC_MT2701 && I2C

1
sound/soc/mediatek/mt2701/Makefile
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@ -5,4 +5,5 @@ obj-$(CONFIG_SND_SOC_MT2701) += snd-soc-mt2701-afe.o
# machine driver
obj-$(CONFIG_SND_SOC_MT2701_CS42448) += mt2701-cs42448.o
obj-$(CONFIG_SND_SOC_MT2701_HDMI) += mt2701-hdmi.o
obj-$(CONFIG_SND_SOC_MT2701_WM8960) += mt2701-wm8960.o

114
sound/soc/mediatek/mt2701/mt2701-hdmi.c Normal file
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@ -0,0 +1,114 @@
// SPDX-License-Identifier: GPL-2.0
/*
* mt2701-hdmi.c -- MT2701 HDMI ALSA SoC machine driver
*
* Copyright (c) 2026 Daniel Golle <daniel@makrotopia.org>
*
* Based on mt2701-cs42448.c
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
enum {
DAI_LINK_FE_HDMI_OUT,
DAI_LINK_BE_HDMI_I2S,
};
SND_SOC_DAILINK_DEFS(fe_hdmi_out,
DAILINK_COMP_ARRAY(COMP_CPU("PCM_HDMI")),
DAILINK_COMP_ARRAY(COMP_DUMMY()),
DAILINK_COMP_ARRAY(COMP_EMPTY()));
SND_SOC_DAILINK_DEFS(be_hdmi_i2s,
DAILINK_COMP_ARRAY(COMP_CPU("HDMI I2S")),
DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "i2s-hifi")),
DAILINK_COMP_ARRAY(COMP_EMPTY()));
static struct snd_soc_dai_link mt2701_hdmi_dai_links[] = {
[DAI_LINK_FE_HDMI_OUT] = {
.name = "HDMI Playback",
.stream_name = "HDMI Playback",
.trigger = { SND_SOC_DPCM_TRIGGER_POST,
SND_SOC_DPCM_TRIGGER_POST },
.dynamic = 1,
.playback_only = 1,
SND_SOC_DAILINK_REG(fe_hdmi_out),
},
[DAI_LINK_BE_HDMI_I2S] = {
.name = "HDMI BE",
.no_pcm = 1,
.playback_only = 1,
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBC_CFC,
SND_SOC_DAILINK_REG(be_hdmi_i2s),
},
};
static struct snd_soc_card mt2701_hdmi_soc_card = {
.name = "mt2701-hdmi",
.owner = THIS_MODULE,
.dai_link = mt2701_hdmi_dai_links,
.num_links = ARRAY_SIZE(mt2701_hdmi_dai_links),
};
static int mt2701_hdmi_machine_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = &mt2701_hdmi_soc_card;
struct device *dev = &pdev->dev;
struct device_node *platform_node;
struct device_node *codec_node;
struct snd_soc_dai_link *dai_link;
int ret;
int i;
platform_node = of_parse_phandle(dev->of_node, "mediatek,platform", 0);
if (!platform_node)
return dev_err_probe(dev, -EINVAL,
"Property 'mediatek,platform' missing\n");
for_each_card_prelinks(card, i, dai_link) {
if (dai_link->platforms->name)
continue;
dai_link->platforms->of_node = platform_node;
}
codec_node = of_parse_phandle(dev->of_node, "mediatek,audio-codec", 0);
if (!codec_node) {
of_node_put(platform_node);
return dev_err_probe(dev, -EINVAL,
"Property 'mediatek,audio-codec' missing\n");
}
mt2701_hdmi_dai_links[DAI_LINK_BE_HDMI_I2S].codecs->of_node = codec_node;
card->dev = dev;
ret = devm_snd_soc_register_card(dev, card);
of_node_put(platform_node);
of_node_put(codec_node);
return ret;
}
static const struct of_device_id mt2701_hdmi_machine_dt_match[] = {
{ .compatible = "mediatek,mt2701-hdmi-audio" },
{ .compatible = "mediatek,mt7623n-hdmi-audio" },
{}
};
MODULE_DEVICE_TABLE(of, mt2701_hdmi_machine_dt_match);
static struct platform_driver mt2701_hdmi_machine = {
.driver = {
.name = "mt2701-hdmi",
.of_match_table = mt2701_hdmi_machine_dt_match,
},
.probe = mt2701_hdmi_machine_probe,
};
module_platform_driver(mt2701_hdmi_machine);
MODULE_DESCRIPTION("MT2701 HDMI ALSA SoC machine driver");
MODULE_AUTHOR("Daniel Golle <daniel@makrotopia.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mt2701-hdmi");