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

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Message-ID: <bcikdrswcqyibzvtygavuev4c5g3lphdmvl5l3xtxlihshaxpl@miwpuwyfacqv>
Date: Wed, 14 Jan 2026 05:14:24 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yijie Yang <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 Wed, Jan 14, 2026 at 10:27:16AM +0800, Yijie Yang wrote:
> 
> 
> 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.

Then:

As a result, implement corresponding changes to OF graph connections
between USB-C connectors and USB host controllers.

Or just drop this phrase completely.

> 
> > 
> > > 
> > > 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
> 

-- 
With best wishes
Dmitry