linux-kernel - Re: [PATCH v3 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board

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Message-ID: <3906614d-d9df-485c-963b-603e2311bc2c@oss.qualcomm.com>
Date: Wed, 14 Jan 2026 10:27:16 +0800
From: Yijie Yang <yijie.yang@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board



On 1/13/2026 6:52 PM, Dmitry Baryshkov wrote:
> On Tue, Jan 13, 2026 at 06:28:16PM +0800, YijieYang wrote:
>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>
>> The PURWA-IOT-EVK is an evaluation platform for IoT products, composed of
>> the Purwa IoT SoM and a carrier board. Together, they form a complete
>> embedded system capable of booting to UART.
>>
>> PURWA-IOT-EVK uses the PS8833 as a retimer for USB0, unlike HAMOA-IOT-EVK.
>> Meanwhile, USB0 bypasses the SBU selector FSUSB42. As a result, the glink
>> topology differs from that of HAMOA-IOT-EVK.
> 
> What is "glink topology"?

What I’m referring to here is that the graph composed of glink nodes and 
their peers.

> 
>>
>> Make the following peripherals on the carrier board enabled:
>> - UART
>> - On-board regulators
>> - USB Type-C mux
>> - Pinctrl
>> - Embedded USB (EUSB) repeaters
>> - NVMe
>> - pmic-glink
>> - USB DisplayPorts
>> - Bluetooth
>> - WLAN
>> - Audio
>> - PCIe ports for PCIe3 through PCIe6a
>>
>> Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
>> ---
>>   arch/arm64/boot/dts/qcom/Makefile             |   1 +
>>   .../{hamoa-iot-evk.dts => purwa-iot-evk.dts}  | 102 +++++++++++-------
>>   2 files changed, 65 insertions(+), 38 deletions(-)
>>   copy arch/arm64/boot/dts/qcom/{hamoa-iot-evk.dts => purwa-iot-evk.dts} (95%)
>>
>> @@ -1102,9 +1140,7 @@ edp_bl_reg_en: edp-bl-reg-en-state {
>>   		pins = "gpio10";
>>   		function = "normal";
>>   	};
>> -};
>>   
>> -&pmc8380_3_gpios {
> 
> This needs to be fixed in hamoa-iot-evk.dtsi.

Will do.

> 
>>   	pm_sde7_aux_3p3_en: pcie-aux-3p3-default-state {
>>   		pins = "gpio8";
>>   		function = "normal";
>> @@ -1171,16 +1207,6 @@ &smb2360_2_eusb2_repeater {
>>   	vdd3-supply = <&vreg_l8b_3p0>;
>>   };
>>   
>> -&spi11 {
>> -	status = "okay";
>> -
>> -	tpm@0 {
>> -		compatible = "st,st33htpm-spi", "tcg,tpm_tis-spi";
> 
> No TPM on the board?

It has not been verified yet since this patch set was sent out; I will 
add it.

> 
>> -		reg = <0>;
>> -		spi-max-frequency = <20000000>;
>> -	};
>> -};
>> -
>>   &swr0 {
>>   	status = "okay";
>>   
>> @@ -1470,7 +1496,7 @@ &usb_1_ss0_hsphy {
>>   };
>>   
>>   &usb_1_ss0_qmpphy_out {
>> -	remote-endpoint = <&pmic_glink_ss0_ss_in>;
>> +	remote-endpoint = <&retimer_ss0_ss_in>;
>>   };
>>   
>>   &usb_1_ss1_dwc3_hs {
>> -- 
>> 2.34.1
>>
> 

-- 
Best Regards,
Yijie