linux-kernel - Re: [PATCH v2 5/5] arm64: dts: qcom: x1e78100-t14s: Enable audio headset support

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Message-ID: <z34vbkdvocuxjtnqwce7rbiwerrp4gmgfamxreo5swts4pvt54@h5u7tfmjdz5j>
Date: Thu, 20 Mar 2025 15:58:24 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: srinivas.kandagatla@...aro.org
Cc: peda@...ntia.se, broonie@...nel.org, andersson@...nel.org,
        krzk+dt@...nel.org, ivprusov@...utedevices.com,
        luca.ceresoli@...tlin.com, zhoubinbin@...ngson.cn,
        paulha@...nsource.cirrus.com, lgirdwood@...il.com, robh@...nel.org,
        conor+dt@...nel.org, konradybcio@...nel.org, perex@...ex.cz,
        tiwai@...e.com, linux-sound@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, johan+linaro@...nel.org
Subject: Re: [PATCH v2 5/5] arm64: dts: qcom: x1e78100-t14s: Enable audio
 headset support

On Thu, Mar 20, 2025 at 11:56:33AM +0000, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> On Lenovo ThinkPad T14s, the headset is connected via a HiFi mux to
> support CTIA and OMTP headsets. This switch is used to minimise pop and
> click during headset type switching.
> 
> Enable the mux controls required to power this switch along with wiring up
> gpio that control the headset switching.
> 
> Without this, headset audio will be very noisy and might see headset
> detection errors.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../qcom/x1e78100-lenovo-thinkpad-t14s.dts    | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> index b2c2347f54fa..b40775c20493 100644
> --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
> @@ -19,6 +19,16 @@ / {
>  	compatible = "lenovo,thinkpad-t14s", "qcom,x1e78100", "qcom,x1e80100";
>  	chassis-type = "laptop";
>  
> +	/* two muxes together support CTIA and OMTP switching */
> +	us_euro_mux_ctrl: mux-controller {

This node should find its place so that the nodes are sorted
alphabetically.

> +		compatible = "gpio-mux";
> +		pinctrl-0 = <&us_euro_hs_sel>;
> +		pinctrl-names = "default";
> +		mux-supply = <&vreg_l16b_2p5>;
> +		#mux-control-cells = <0>;
> +		mux-gpios = <&tlmm 68 GPIO_ACTIVE_HIGH>;
> +	};
> +
>  	wcd938x: audio-codec {
>  		compatible = "qcom,wcd9385-codec";
>  

[...]

> @@ -942,6 +960,13 @@ int-n-pins {
>  		};
>  	};
>  
> +	us_euro_hs_sel: us-euro-hs-sel-state {

This one also should be moved to keep them sorted.

LGTM otherwise.

> +		pins = "gpio68";
> +		function = "gpio";
> +		bias-pull-down;
> +		drive-strength = <2>;
> +	};
> +
>  	kybd_default: kybd-default-state {
>  		pins = "gpio67";
>  		function = "gpio";
> -- 
> 2.39.5
> 

-- 
With best wishes
Dmitry