linux-kernel - [PATCH v3 5/8] arm64: dts: ti: am62x-sk: Add overlay for HDMI audio

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Message-ID: <20230728173438.12995-6-a-bhatia1@ti.com>
Date:   Fri, 28 Jul 2023 23:04:35 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Conor Dooley <conor+dt@...nel.org>
CC:     Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Rahul T R <r-ravikumar@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jai Luthra <j-luthra@...com>,
        Jayesh Choudhary <j-choudhary@...com>,
        Aradhya Bhatia <a-bhatia1@...com>
Subject: [PATCH v3 5/8] arm64: dts: ti: am62x-sk: Add overlay for HDMI audio

From: Jai Luthra <j-luthra@...com>

Enable audio output over HDMI instead of the 3.5mm jack.

A FET switch (U65) on the EVM muxes serial audio lines coming from McASP
between the codec (tlv320aic3106) and the HDMI bridge (sii9022).

By default it uses the codec, but it can be toggled to use the HDMI
bridge by shorting a (J24) header on the board.

Signed-off-by: Jai Luthra <j-luthra@...com>
[a-bhatia1: Cosmetic changes]
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 arch/arm64/boot/dts/ti/Makefile               |  3 ++
 .../boot/dts/ti/k3-am62x-sk-hdmi-audio.dtso   | 40 +++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am62x-sk-hdmi-audio.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 6dd7b6f1d6ab..b814f6c4b860 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -19,6 +19,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-dahlia.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-dev.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-yavia.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am62-lp-sk.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-am62x-sk-hdmi-audio.dtbo
 
 # Boards with AM62Ax SoC
 dtb-$(CONFIG_ARCH_K3) += k3-am62a7-sk.dtb
@@ -58,3 +59,5 @@ dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
 
 # Enable support for device-tree overlays
 DTC_FLAGS_k3-am6548-iot2050-advanced-m2 += -@
+DTC_FLAGS_k3-am625-sk += -@
+DTC_FLAGS_k3-am62-lp-sk += -@
diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-hdmi-audio.dtso b/arch/arm64/boot/dts/ti/k3-am62x-sk-hdmi-audio.dtso
new file mode 100644
index 000000000000..43a0ddc123e5
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-hdmi-audio.dtso
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * Audio playback via HDMI for AM625-SK and AM62-LP SK.
+ *
+ * Links:
+ * AM625 SK: https://www.ti.com/tool/SK-AM62
+ * AM62-LP SK: https://www.ti.com/tool/SK-AM62-LP
+ *
+ * Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+	hdmi_audio: sound-sii9022 {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "AM62x-Sil9022-HDMI";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,bitclock-master = <&hdmi_dailink_master>;
+		simple-audio-card,frame-master = <&hdmi_dailink_master>;
+
+		hdmi_dailink_master: simple-audio-card,cpu {
+			sound-dai = <&mcasp1>;
+			system-clock-direction-out;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&sii9022>;
+		};
+	};
+};
+
+&mcasp1 {
+	auxclk-fs-ratio = <2177>;
+};
+
+&codec_audio {
+	status = "disabled";
+};
-- 
2.40.1