linux-kernel - [PATCH RFC 5/6] sm8550-hdk: Enable I2S for HDMI

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Message-Id: <20251006-topic-sm8x50-next-hdk-i2s-v1-5-184b15a87e0a@linaro.org>
Date: Mon, 06 Oct 2025 20:37:18 +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 5/6] sm8550-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/sm8550-hdk.dts | 30 ++++++++++++++
 arch/arm64/boot/dts/qcom/sm8550.dtsi    | 73 +++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8550-hdk.dts b/arch/arm64/boot/dts/qcom/sm8550-hdk.dts
index b5d7f0cd443a18b167c94e450b5b9412897b2ba2..29c31a3d380d52155a605b24fff793745ba3b17c 100644
--- a/arch/arm64/boot/dts/qcom/sm8550-hdk.dts
+++ b/arch/arm64/boot/dts/qcom/sm8550-hdk.dts
@@ -215,6 +215,18 @@ sound {
 				"TX SWR_INPUT1", "ADC2_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";
 
@@ -278,6 +290,22 @@ 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>;
+			};
+		};
 	};
 
 	wcn7850-pmu {
@@ -891,6 +919,8 @@ lt9611_codec: hdmi-bridge@2b {
 		pinctrl-0 = <&lt9611_irq_pin>, <&lt9611_rst_pin>;
 		pinctrl-names = "default";
 
+		#sound-dai-cells = <1>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
index 7724dba75db79a9e66a2c61e1ea3607bacfdf5bb..73df93288f6e0ed71ec1e7f5ae09276e7593fd60 100644
--- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
@@ -4956,6 +4956,79 @@ data-pins {
 					drive-strength = <10>;
 				};
 			};
+
+			audio_mclk0_default_state: audio-mclk0-default-state {
+				pins = "gpio125";
+				function = "audio_ext_mclk0";
+				drive-strength = <8>;
+				bias-disable;
+				output-high;
+			};
+
+			i2s0_default_state: i2s0-default-state {
+				sck-pins {
+					pins = "gpio126";
+					function = "i2s0_sck";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+
+				data0-pins {
+					pins = "gpio127";
+					function = "i2s0_data0";
+					drive-strength = <8>;
+					bias-disable;
+				};
+
+				data1-pins {
+					pins = "gpio128";
+					function = "i2s0_data1";
+					drive-strength = <8>;
+					bias-disable;
+				};
+
+				ws-pins {
+					pins = "gpio129";
+					function = "i2s0_ws";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+			};
+
+			audio_mclk1_default_state: audio-mclk1-default-state {
+				pins = "gpio124";
+				function = "audio_ext_mclk1";
+				drive-strength = <8>;
+				bias-disable;
+				output-high;
+			};
+
+			i2s1_default_state: i2s1-default-state {
+				sck-pins {
+					pins = "gpio121";
+					function = "i2s1_sck";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+
+				data0-pins {
+					pins = "gpio122";
+					function = "i2s1_data0";
+					drive-strength = <8>;
+					bias-disable;
+				};
+
+				ws-pins {
+					pins = "gpio123";
+					function = "i2s1_ws";
+					drive-strength = <8>;
+					bias-disable;
+					output-high;
+				};
+			};
 		};
 
 		apps_smmu: iommu@...00000 {

-- 
2.34.1