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

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Message-ID: <1600b292-df57-4328-baa6-db6467e00096@quicinc.com>
Date: Mon, 1 Sep 2025 11:02:24 +0800
From: Yingying Tang <quic_yintang@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Yijie Yang
	<yijie.yang@....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>,
        Yingying Tang <yintang@....qualcomm.com>,
        <miaoqing.pan@....qualcomm.com>,
        "stone Zhang (Stone)"
	<stonez@....qualcomm.com>,
        <zhichen@....qualcomm.com>
Subject: Re: [PATCH v8 3/3] arm64: dts: qcom: Add base HAMOA-IOT-EVK board



On 8/28/2025 7:18 PM, 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.
> 
>> +		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.
> 
Hi Dmitry, as I described in previous mail, On hamoa platfrom whole wifi module's power supply and enable gpio are voted in UEFI.
Hamoa is PC platform, so BIOS/UEFI behavior is compatible with Windows/ACPI architecture. UEFI is responsible for enabling power supply 
for all devices which may be used in boot phase (such as WLAN may be used to boot from network).

So we need not Wifi chip's power and control GPIO in kernel side, thanks 
>> +
>> +		pinctrl-0 = <&wcn_bt_en>;
>> +		pinctrl-names = "default";
>> +
>