linux-kernel - Re: [PATCH RFC v2 4/6] arm64: dts: qcom: sm8450-hdk: Enable I2S for HDMI

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Message-ID: <488d9182-175e-47a9-9dc1-f43753d6fdbc@oss.qualcomm.com>
Date: Thu, 9 Oct 2025 14:37:45 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        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
Subject: Re: [PATCH RFC v2 4/6] arm64: dts: qcom: sm8450-hdk: Enable I2S for
 HDMI

On 10/8/25 8:56 PM, Neil Armstrong wrote:
> 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 | 26 +++++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sm8450.dtsi    | 40 +++++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8450-hdk.dts b/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
> index 0c6aa7ddf43263f30595b3f0733ec3e126e38608..7b822086a57c600ae9b5668d6d7a375d0ec55fa7 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 +1018,14 @@ &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 = "primart-mi2s",

"primary-mi2s"

[...]

> +			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;

I doubt output-high for a clock pin is what you want..

> +				};
> +
> +				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;

here too

Konrad