linux-kernel - [PATCH 11/11] [EXAMPLE] arm64: dts: allwinner: a527-cubie-a5e: Enable I2S and SPDIF output

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Message-ID: <20251020171059.2786070-12-wens@kernel.org>
Date: Tue, 21 Oct 2025 01:10:57 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Chen-Yu Tsai <wens@...nel.org>,
	Jernej Skrabec <jernej@...nel.org>,
	Samuel Holland <samuel@...lland.org>,
	Mark Brown <broonie@...nel.org>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vinod Koul <vkoul@...nel.org>
Cc: linux-sunxi@...ts.linux.dev,
	linux-sound@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 11/11] [EXAMPLE] arm64: dts: allwinner: a527-cubie-a5e: Enable I2S and SPDIF output

This is an example change.

The Radxa Cubie A5E exposes I2S2 and SPDIF on the 40-pin header. Enable
both.

In this example, I2S2 is connected to adafruit speaker bonnet, which
sports a pair of MAX98357A for speaker amplication. SPDIF is connected
to a SPDIF interface card for PCs, which has both coaxial and optical
outputs. The output was connected via optical cable to a dumb SPDIF to
analog audio converter.

Signed-off-by: Chen-Yu Tsai <wens@...nel.org>
---
 .../dts/allwinner/sun55i-a527-cubie-a5e.dts   | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts b/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
index bfdf1728cd14..828d101d28e8 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
+++ b/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
@@ -64,6 +64,46 @@ reg_usb_vbus: vbus {
 		gpio = <&r_pio 0 8 GPIO_ACTIVE_HIGH>;	/* PL8 */
 		enable-active-high;
 	};
+
+	codec: audio-codec {
+		compatible = "maxim,max98360a";
+		#sound-dai-cells = <0>;
+	};
+
+	sound-i2s {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "I2S";
+		simple-audio-card,format = "left_j";
+		simple-audio-card,bitclock-master = <&dailink_cpu>;
+		simple-audio-card,frame-master = <&dailink_cpu>;
+		simple-audio-card,mclk-fs = <128>;
+
+		dailink_cpu: simple-audio-card,cpu {
+			sound-dai = <&i2s2>;
+		};
+
+		dailink0_master: simple-audio-card,codec {
+			sound-dai = <&codec>;
+		};
+	};
+
+	sound-spdif {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "spdif-out";
+
+		simple-audio-card,cpu {
+			sound-dai = <&spdif>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&spdif_out>;
+		};
+	};
+
+	spdif_out: spdif-out {
+		#sound-dai-cells = <0>;
+		compatible = "linux,spdif-dit";
+	};
 };
 
 &ehci0 {
@@ -101,6 +141,12 @@ &gpu {
 	status = "okay";
 };
 
+&i2s2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2s2_pi_pins>;
+	status = "okay";
+};
+
 &mdio0 {
 	ext_rgmii0_phy: ethernet-phy@1 {
 		compatible = "ethernet-phy-ieee802.3-c22";
@@ -344,6 +390,12 @@ &r_pio {
 	vcc-pm-supply = <&reg_aldo3>;
 };
 
+&spdif {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spdif_out_pi_pin>;
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_pb_pins>;
-- 
2.47.3