[PATCH v2] arm64: dts: mediatek: mt8395-nio-12l: Enable Audio DSP and sound card

[Julien Massot <julien.massot@collabora.com>]

Add memory regions for the Audio DSP (ADSP) and Audio Front-End (AFE),
and enable both components in the device tree.

Also, define the required pin configuration and add a sound card node
configured to use the ADSP. This enables audio output through the 3.5mm
headphone jack available on the board.

Signed-off-by: Julien Massot <julien.massot@collabora.com>
---
This patch series adds support for audio playback on the MT8395-based Radxa NIO 12L platform, which uses the integrated MT6359 codec via internal DAI links.

Key additions:
- Support for a new `mediatek,mt8195_mt6359` card configuration that does not rely on external codecs like rt5682.
- Proper memory region declarations and pinctrl setup for the audio front-end (AFE) and audio DSP (ADSP).
- A device tree sound node for headphone audio routing using `DL_SRC_BE` and `AIF1`.
- Enhancements to the DT bindings to document the new compatible string, missing link-name, and additional audio routes (Headphone L/R).
---
Changes in v2:
- The first five commits have already been merged into linux-next; only one remains pending.
- Improved the commit description of the former patch 6/6, now labeled as 1/1.
- Link to v1: https://lore.kernel.org/r/20250417-mt8395-audio-sof-v1-0-30587426e5dd@collabora.com
---
 .../boot/dts/mediatek/mt8395-radxa-nio-12l.dts     | 58 +++++++++++++++++++++-
 1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts b/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
index f2eb1b683eb76f783f5a13f28a78f6e33238b5f0..329c60cc6a6be0b4be8c0b8bb033b32d35302804 100644
--- a/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts
@@ -139,9 +139,21 @@ bl31_secmon_mem: memory@54600000 {
 			no-map;
 		};
 
-		afe_mem: memory@60000000 {
+		adsp_mem: memory@60000000 {
 			compatible = "shared-dma-pool";
-			reg = <0 0x60000000 0 0x1100000>;
+			reg = <0 0x60000000 0 0xf00000>;
+			no-map;
+		};
+
+		afe_dma_mem: memory@60f00000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x60f00000 0 0x100000>;
+			no-map;
+		};
+
+		adsp_dma_mem: memory@61000000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x61000000 0 0x100000>;
 			no-map;
 		};
 
@@ -152,6 +164,16 @@ apu_mem: memory@62000000 {
 	};
 };
 
+&adsp {
+	memory-region = <&adsp_dma_mem>, <&adsp_mem>;
+	status = "okay";
+};
+
+&afe {
+	memory-region = <&afe_dma_mem>;
+	status = "okay";
+};
+
 &cpu0 {
 	cpu-supply = <&mt6359_vcore_buck_reg>;
 };
@@ -514,6 +536,18 @@ &mt6359_vsram_others_ldo_reg {
 &pio {
 	mediatek,rsel-resistance-in-si-unit;
 
+	audio_default_pins: audio-default-pins {
+		pins-cmd-dat {
+			pinmux = <PINMUX_GPIO70__FUNC_AUD_SYNC_MOSI>,
+				 <PINMUX_GPIO69__FUNC_AUD_CLK_MOSI>,
+				 <PINMUX_GPIO71__FUNC_AUD_DAT_MOSI0>,
+				 <PINMUX_GPIO72__FUNC_AUD_DAT_MOSI1>,
+				 <PINMUX_GPIO73__FUNC_AUD_DAT_MISO0>,
+				 <PINMUX_GPIO74__FUNC_AUD_DAT_MISO1>,
+				 <PINMUX_GPIO75__FUNC_AUD_DAT_MISO2>;
+		};
+	};
+
 	dsi0_backlight_pins: dsi0-backlight-pins {
 		pins-backlight-en {
 			pinmux = <PINMUX_GPIO107__FUNC_GPIO107>;
@@ -854,6 +888,26 @@ &scp {
 	status = "okay";
 };
 
+&sound {
+	compatible = "mediatek,mt8195_mt6359";
+	model = "mt8395-evk";
+	pinctrl-names = "default";
+	pinctrl-0 = <&audio_default_pins>;
+	audio-routing =
+		"Headphone", "Headphone L",
+		"Headphone", "Headphone R";
+	mediatek,adsp = <&adsp>;
+	status = "okay";
+
+	headphone-dai-link {
+		link-name = "DL_SRC_BE";
+
+		codec {
+			sound-dai = <&pmic 0>;
+		};
+	};
+};
+
 &spi1 {
 	/* Exposed at 40 pin connector */
 	pinctrl-0 = <&spi1_pins>;

---
base-commit: bc8aa6cdadcc00862f2b5720e5de2e17f696a081
change-id: 20250417-mt8395-audio-sof-baa2c62803df

Best regards,
-- 
Julien Massot <julien.massot@collabora.com>