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

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Message-ID: <2qa3kn6gw4f5qlncq6iwgxattfbbztu42gpcbekqfghcrdg3l5@z7zsx44xch7a>
Date: Tue, 13 Jan 2026 12:52:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: YijieYang <yijie.yang@....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 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"?

> 
> 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.

>  	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?

> -		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
> 

-- 
With best wishes
Dmitry