From: Daniel Golle Date: Fri, 24 Apr 2026 02:50:23 +0000 (+0100) Subject: ASoC: mediatek: mt2701: add machine driver for on-chip HDMI codec X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4d9c6bbfed7d9a3224a66f3d135cdef21a430168;p=thirdparty%2Flinux.git ASoC: mediatek: mt2701: add machine driver for on-chip HDMI codec 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 Link: https://patch.msgid.link/1dafc8147ee09d44de53b69bca792bdbfe13e8b0.1776998727.git.daniel@makrotopia.org Signed-off-by: Mark Brown --- diff --git a/sound/soc/mediatek/Kconfig b/sound/soc/mediatek/Kconfig index 3a1e1fa3fe5cc..fa076e7854adc 100644 --- a/sound/soc/mediatek/Kconfig +++ b/sound/soc/mediatek/Kconfig @@ -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 diff --git a/sound/soc/mediatek/mt2701/Makefile b/sound/soc/mediatek/mt2701/Makefile index 507fa26c39452..59623d3d3a038 100644 --- a/sound/soc/mediatek/mt2701/Makefile +++ b/sound/soc/mediatek/mt2701/Makefile @@ -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 diff --git a/sound/soc/mediatek/mt2701/mt2701-hdmi.c b/sound/soc/mediatek/mt2701/mt2701-hdmi.c new file mode 100644 index 0000000000000..a84907879c04e --- /dev/null +++ b/sound/soc/mediatek/mt2701/mt2701-hdmi.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mt2701-hdmi.c -- MT2701 HDMI ALSA SoC machine driver + * + * Copyright (c) 2026 Daniel Golle + * + * Based on mt2701-cs42448.c + */ + +#include +#include +#include +#include + +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 "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mt2701-hdmi");