linux-kernel - Re: [PATCH v8 3/3] arm64: dts: qcom: Add base HAMOA-IOT-EVK board

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Message-ID: <2de9fa44-0d77-4631-9d09-32c48a93a7f6@oss.qualcomm.com>
Date: Mon, 1 Sep 2025 16:00:35 +0800
From: Yijie Yang <yijie.yang@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 3/3] arm64: dts: qcom: Add base HAMOA-IOT-EVK board



On 2025-08-28 19:18, Dmitry Baryshkov wrote:
> On Thu, Aug 28, 2025 at 12:48:47PM +0800, Yijie Yang wrote:
>> The HAMOA-IOT-EVK is an evaluation platform for IoT products, composed of
>> the Hamoa IoT SoM and a carrier board. Together, they form a complete
>> embedded system capable of booting to UART.
>>
>> This change enables the following peripherals on the carrier board:
>> - UART
>> - On-board regulators
>> - USB Type-C mux
>> - Pinctrl
>> - Embedded USB (EUSB) repeaters
>> - NVMe
>> - pmic-glink
>> - USB DisplayPorts
>> - Bluetooth
>> - Graphic
>> - Audio
>>
>> Written in collaboration with Quill Qi (Audio) <le.qi@....qualcomm.com>,
>> Jie Zhang (Graphics) <quic_jiezh@...cinc.com>, Shuai Zhang (Bluetooth)
>> <quic_shuaz@...cinc.com>, and Yongxing Mou (USB DisplayPorts)
>> <quic_yongmou@...cinc.com>.
>>
>> Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
>> ---
>>   arch/arm64/boot/dts/qcom/Makefile          |    1 +
>>   arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 1247 ++++++++++++++++++++++++++++
>>   2 files changed, 1248 insertions(+)
>>
>> +
>> +	wcd938x: audio-codec {
>> +		compatible = "qcom,wcd9385-codec";
>> +
>> +		pinctrl-0 = <&wcd_default>;
>> +		pinctrl-names = "default";
>> +
>> +		reset-gpios = <&tlmm 191 GPIO_ACTIVE_LOW>;
>> +
>> +		qcom,micbias1-microvolt = <1800000>;
>> +		qcom,micbias2-microvolt = <1800000>;
>> +		qcom,micbias3-microvolt = <1800000>;
>> +		qcom,micbias4-microvolt = <1800000>;
>> +		qcom,mbhc-buttons-vthreshold-microvolt = <75000 150000 237000 500000
>> +		500000 500000 500000 500000>;
> 
> Other platforms use a single line here. If you don't want to do it,
> align data to start from the same column rather than restarting from the
> column 1.

I will update it to a single line.

> 
>> +		qcom,mbhc-headset-vthreshold-microvolt = <1700000>;
>> +		qcom,mbhc-headphone-vthreshold-microvolt = <50000>;
>> +		qcom,rx-device = <&wcd_rx>;
>> +		qcom,tx-device = <&wcd_tx>;
>> +
>> +		vdd-buck-supply = <&vreg_l15b_1p8>;
>> +		vdd-rxtx-supply = <&vreg_l15b_1p8>;
>> +		vdd-io-supply = <&vreg_l15b_1p8>;
>> +		vdd-mic-bias-supply = <&vreg_bob1>;
>> +
>> +		#sound-dai-cells = <1>;
>> +	};
>> +
>> +	wcn7850-pmu {
>> +		compatible = "qcom,wcn7850-pmu";
>> +
>> +		vdd-supply = <&vreg_wcn_0p95>;
>> +		vddio-supply = <&vreg_l15b_1p8>;
>> +		vddaon-supply = <&vreg_wcn_0p95>;
>> +		vdddig-supply = <&vreg_wcn_0p95>;
>> +		vddrfa1p2-supply = <&vreg_wcn_1p9>;
>> +		vddrfa1p8-supply = <&vreg_wcn_1p9>;
>> +
>> +		bt-enable-gpios = <&tlmm 116 GPIO_ACTIVE_HIGH>;
> 
> Okay, so how is WiFi controlled? Is there a GPIO? The DT should be
> describing the hardware, not the UEFI behaviour.
> 
>> +
>> +		pinctrl-0 = <&wcn_bt_en>;
>> +		pinctrl-names = "default";
>> +
> 

-- 
Best Regards,
Yijie