linux-kernel - [PATCH RFC 6/6] sm8450-hdk: Enable I2S for HDMI

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Message-Id: <20251006-topic-sm8x50-next-hdk-i2s-v1-6-184b15a87e0a@linaro.org>
Date: Mon, 06 Oct 2025 20:37:19 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Srinivas Kandagatla <srini@...nel.org>, 
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH RFC 6/6] sm8450-hdk: Enable I2S for HDMI

Add the necessary nodes to configure the right I2S interface
to output audio via the DSI HDMI bridge.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 arch/arm64/boot/dts/qcom/sm8450-hdk.dts | 30 +++++++++++++++++++++++++
 arch/arm64/boot/dts/qcom/sm8450.dtsi    | 40 +++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8450-hdk.dts b/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
index 0c6aa7ddf43263f30595b3f0733ec3e126e38608..c8fd4c8c6bc644ccb5f9fb05c099f27513b86e99 100644
--- a/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
+++ b/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
@@ -667,6 +667,8 @@ lt9611_codec: hdmi-bridge@2b {
 		pinctrl-names = "default";
 		pinctrl-0 = <&lt9611_irq_pin &lt9611_rst_pin>;
 
+		#sound-dai-cells = <1>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
@@ -1016,6 +1018,18 @@ &sound {
 			"TX SWR_INPUT0", "ADC3_OUTPUT",
 			"TX SWR_INPUT1", "ADC4_OUTPUT";
 
+	pinctrl-0 = <&i2s0_default_state>, <&audio_mclk0_default_state>;
+	pinctrl-names = "default";
+	clocks = <&q6prmcc LPASS_CLK_ID_PRI_MI2S_IBIT LPASS_CLK_ATTRIBUTE_COUPLE_NO>,
+		 <&q6prmcc LPASS_CLK_ID_MCLK_1 LPASS_CLK_ATTRIBUTE_COUPLE_NO>;
+	clock-names = "pri-mi2s",
+		      "pri-mclk";
+
+	assigned-clocks = <&q6prmcc LPASS_CLK_ID_PRI_MI2S_IBIT LPASS_CLK_ATTRIBUTE_COUPLE_NO>,
+			  <&q6prmcc LPASS_CLK_ID_MCLK_1 LPASS_CLK_ATTRIBUTE_COUPLE_NO>;
+	assigned-clock-rates = <1536000>,
+				       <24576000>;
+
 	wcd-playback-dai-link {
 		link-name = "WCD Playback";
 
@@ -1079,6 +1093,22 @@ platform {
 			sound-dai = <&q6apm>;
 		};
 	};
+
+	prim-mi2s-dai-link {
+		link-name = "Primary MI2S Playback";
+
+		cpu {
+			sound-dai = <&q6apmbedai PRIMARY_MI2S_RX>;
+		};
+
+		codec {
+			sound-dai = <&lt9611_codec 0>;
+		};
+
+		platform {
+			sound-dai = <&q6apm>;
+		};
+	};
 };
 
 &swr0 {
diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
index 23420e6924728cb80fc9e44fb4d7e01fbffae21f..5ddc1169e8c23327261820f7baa31983a3eb0bf8 100644
--- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
@@ -4288,6 +4288,46 @@ qup_uart20_default: qup-uart20-default-state {
 				pins = "gpio76", "gpio77", "gpio78", "gpio79";
 				function = "qup20";
 			};
+
+			audio_mclk0_default_state: audio-mclk0-default-state {
+				pins = "gpio125";
+				function = "pri_mi2s";
+				drive-strength = <8>;
+				bias-disable;
+				output-high;
+			};
+
+			i2s0_default_state: i2s0-default-state {
+				sck-pins {
+					pins = "gpio126";
+					function = "mi2s0_sck";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+
+				data0-pins {
+					pins = "gpio127";
+					function = "mi2s0_data0";
+					drive-strength = <8>;
+					bias-disable;
+				};
+
+				data1-pins {
+					pins = "gpio128";
+					function = "mi2s0_data1";
+					drive-strength = <8>;
+					bias-disable;
+				};
+
+				ws-pins {
+					pins = "gpio129";
+					function = "mi2s0_ws";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+			};
 		};
 
 		lpass_tlmm: pinctrl@...0000 {

-- 
2.34.1