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Message-ID: <20260205130707.2033197-2-m-shah@ti.com>
Date: Thu, 5 Feb 2026 18:37:07 +0530
From: Moteen Shah <m-shah@...com>
To: <krzk+dt@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
<nm@...com>, <vigneshr@...com>, <kristo@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <u-kumar1@...com>, <gehariprasath@...com>,
<y-abhilashchandra@...com>, <m-shah@...com>
Subject: [PATCH v2 2/2] arm64: dts: ti: Add audio overlay for k3-j721s2-evm
From: Jayesh Choudhary <j-choudhary@...com>
Add device tree overlay to enable analog audio support on J721S2-EVM
using PCM3168A codec connected to McASP4 serializers.
- Add nodes for sound-card, audio codec, I2C3 and McASP4
- Add pinmux for I2C3, McASP4, AUDIO_EXT_REFCLK1 and WKUP_GPIO_0
- Add GPIO expander (TCA6408) for codec control
- Add GPIO hogs to route I2C3 lines and McASP serializers
- Set idle-state to 0 in mux0 and mux1 for McASP signal routing
Reviewed-by: Hari Prasath Gujulan Elango <gehariprasath@...com>
Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
Co-developed-by: Moteen Shah <m-shah@...com>
Signed-off-by: Moteen Shah <m-shah@...com>
---
arch/arm64/boot/dts/ti/Makefile | 4 +
.../boot/dts/ti/k3-j721s2-evm-audio.dtso | 161 ++++++++++++++++++
2 files changed, 165 insertions(+)
create mode 100644 arch/arm64/boot/dts/ti/k3-j721s2-evm-audio.dtso
diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index ba01a929e06f..aadf783fe252 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -140,6 +140,7 @@ k3-j721s2-evm-dtbs := k3-j721s2-common-proc-board.dtb k3-j721s2-evm-gesi-exp-boa
dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm.dtb
dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-pcie1-ep.dtbo
dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-usb0-type-a.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-audio.dtbo
# Boards with J722s SoC
k3-am67a-kontron-sa67-dtbs := k3-am67a-kontron-sa67-base.dtb \
@@ -268,6 +269,8 @@ k3-j721s2-evm-pcie1-ep-dtbs := k3-j721s2-common-proc-board.dtb \
k3-j721s2-evm-pcie1-ep.dtbo
k3-j721s2-evm-usb0-type-a-dtbs := k3-j721s2-common-proc-board.dtb \
k3-j721s2-evm-usb0-type-a.dtbo
+k3-j721s2-evm-audio-dtbs := k3-j721s2-common-proc-board.dtb \
+ k3-j721s2-evm-audio.dtbo
k3-j722s-evm-csi2-quad-rpi-cam-imx219-dtbs := k3-j722s-evm.dtb \
k3-j722s-evm-csi2-quad-rpi-cam-imx219.dtbo
k3-j722s-evm-csi2-quad-tevi-ov5640-dtbs := k3-j722s-evm.dtb \
@@ -330,6 +333,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
k3-j721e-sk-csi2-dual-imx219.dtb \
k3-j721s2-evm-pcie1-ep.dtb \
k3-j721s2-evm-usb0-type-a.dtb \
+ k3-j721s2-evm-audio.dtb \
k3-j722s-evm-csi2-quad-rpi-cam-imx219.dtb \
k3-j722s-evm-csi2-quad-tevi-ov5640.dtb \
k3-j742s2-evm-usb0-type-a.dtb \
diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-evm-audio.dtso b/arch/arm64/boot/dts/ti/k3-j721s2-evm-audio.dtso
new file mode 100644
index 000000000000..e00d9b6cef5b
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-evm-audio.dtso
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Device Tree Overlay for J721S2 Audio Support
+ *
+ * Copyright (C) 2026 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "k3-pinctrl.h"
+
+&{/} {
+ codec_audio: sound {
+ compatible = "ti,j7200-cpb-audio";
+ model = "j721e-cpb";
+
+ ti,cpb-mcasp = <&mcasp4>;
+ ti,cpb-codec = <&pcm3168a_1>;
+
+ clocks = <&k3_clks 213 0>, <&k3_clks 213 1>,
+ <&k3_clks 157 299>, <&k3_clks 157 328>;
+ clock-names = "cpb-mcasp-auxclk", "cpb-mcasp-auxclk-48000",
+ "cpb-codec-scki", "cpb-codec-scki-48000";
+ };
+
+ i2c_mux: mux-controller-2 {
+ compatible = "gpio-mux";
+ #mux-state-cells = <1>;
+ mux-gpios = <&wkup_gpio0 54 GPIO_ACTIVE_HIGH>;
+ idle-state = <1>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_i2c3_mux_pins_default>;
+ };
+};
+
+&main_pmx0 {
+ mcasp4_pins_default: mcasp4-default-pins {
+ pinctrl-single,pins = <
+ J721S2_IOPAD(0x0c8, PIN_OUTPUT_PULLDOWN, 1) /* (AD28) MCASP4_ACLKX */
+ J721S2_IOPAD(0x06c, PIN_OUTPUT_PULLDOWN, 1) /* (V26) MCASP4_AFSX */
+ J721S2_IOPAD(0x068, PIN_INPUT_PULLDOWN, 1) /* (U28) MCASP4_AXR1 */
+ J721S2_IOPAD(0x0c4, PIN_OUTPUT_PULLDOWN, 1) /* (AB26) MCASP4_AXR2 */
+ J721S2_IOPAD(0x070, PIN_OUTPUT_PULLDOWN, 1) /* (R27) MCASP4_AXR3 */
+ >;
+ };
+
+ audio_ext_refclk1_pins_default: audio-ext-refclk1-default-pins {
+ pinctrl-single,pins = <
+ J721S2_IOPAD(0x078, PIN_OUTPUT, 1) /* (Y25) MCAN2_RX.AUDIO_EXT_REFCLK1 */
+ >;
+ };
+};
+
+&wkup_pmx2 {
+ main_i2c3_mux_pins_default: main-i2c3-mux-default-pins {
+ pinctrl-single,pins = <
+ J721S2_WKUP_IOPAD(0x038, PIN_OUTPUT, 7) /* (B27) WKUP_GPIO0_54 */
+ >;
+ };
+};
+
+&exp2 {
+ p09-hog {
+ /* P09 - MCASP/TRACE_MUX_S0 */
+ gpio-hog;
+ gpios = <9 GPIO_ACTIVE_HIGH>;
+ output-low;
+ line-name = "MCASP/TRACE_MUX_S0";
+ };
+
+ p10-hog {
+ /* P10 - MCASP/TRACE_MUX_S1 */
+ gpio-hog;
+ gpios = <10 GPIO_ACTIVE_HIGH>;
+ output-high;
+ line-name = "MCASP/TRACE_MUX_S1";
+ };
+};
+
+&mux0 {
+ idle-state = <0>;
+};
+
+&mux1 {
+ idle-state = <0>;
+};
+
+&scm_conf {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ audio_refclk1: clock-controller@...4 {
+ compatible = "ti,am62-audio-refclk";
+ reg = <0x42e4 0x4>;
+ clocks = <&k3_clks 157 299>;
+ assigned-clocks = <&k3_clks 157 299>;
+ assigned-clock-parents = <&k3_clks 157 328>;
+ #clock-cells = <0>;
+ };
+};
+
+&k3_clks {
+ /* Configure AUDIO_EXT_REFCLK1 pin as output */
+ pinctrl-names = "default";
+ pinctrl-0 = <&audio_ext_refclk1_pins_default>;
+};
+
+&main_i2c3 {
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_i2c3_pins_default>;
+ clock-frequency = <400000>;
+ mux-states = <&i2c_mux 1>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ exp3: gpio@20 {
+ compatible = "ti,tca6408";
+ reg = <0x20>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-line-names = "CODEC_RSTZ", "CODEC_SPARE1",
+ "UB926_RESETN", "UB926_LOCK",
+ "UBS926_PWR_SW_CNTRL", "UB926_TUNER_RESET",
+ "UB926_GPIO_SPARE";
+ };
+
+ pcm3168a_1: audio-codec@44 {
+ compatible = "ti,pcm3168a";
+ reg = <0x44>;
+ #sound-dai-cells = <1>;
+ reset-gpios = <&exp3 0 GPIO_ACTIVE_LOW>;
+ clocks = <&audio_refclk1>;
+ clock-names = "scki";
+ VDD1-supply = <&vsys_3v3>;
+ VDD2-supply = <&vsys_3v3>;
+ VCCAD1-supply = <&vsys_5v0>;
+ VCCAD2-supply = <&vsys_5v0>;
+ VCCDA1-supply = <&vsys_5v0>;
+ VCCDA2-supply = <&vsys_5v0>;
+ };
+};
+
+&mcasp4 {
+ status = "okay";
+ #sound-dai-cells = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&mcasp4_pins_default>;
+ op-mode = <0>; /* MCASP_IIS_MODE */
+ tdm-slots = <2>;
+ auxclk-fs-ratio = <256>;
+ serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
+ 0 2 1 1
+ 0 0 0 0
+ 0 0 0 0
+ 0 0 0 0
+ >;
+};
--
2.34.1
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