linux-kernel - Re: [PATCH 1/1] arm64: dts: qcom: lemans-evk: Add Mezzanine

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Message-ID: <27c91542-820e-49bd-870a-d492be21958a@oss.qualcomm.com>
Date: Fri, 30 Jan 2026 11:51:19 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Umang Chheda <umang.chheda@....qualcomm.com>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, richardcochran@...il.com
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, mohd.anwar@....qualcomm.com,
        krishna.chundru@....qualcomm.com, monish.chunara@....qualcomm.com
Subject: Re: [PATCH 1/1] arm64: dts: qcom: lemans-evk: Add Mezzanine

On 1/29/26 6:28 PM, Umang Chheda wrote:
> The Mezzanine is an hardware expansion add-on board designed
> to be stacked on top of Lemans EVK.
> 
> It has following peripherals :
> 
> - 4x Type A USB ports in host mode.
> - TC9563 PCIe switch, which has following three downstream ports (DSP) :
>    - 1st DSP connects M.2 E-key connector for connecting WLAN endpoints.
>    - 2nd DSP connects M.2 B-key connector for connecting cellular modems.
>    - 3rd DSP with support for Dual Ethernet ports.
> - eMMC.
> - Additional 2.5GbE Ethernet PHY connected to native EMAC with support for
>   MAC Address configuration via NVMEM.
> - EEPROM.
> - LVDS Display.
> - 2*mini DP.
> 
> Add support for following peripherals :
> - TC9563 PCIe Switch.
> - Additional 2.5GbE Ethernet Port.
> - EEPROM.
> 
> Written with inputs from :
>     Mohd Ayaan Anwar <mohd.anwar@....qualcomm.com> - Ethernet.
>     Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com> - PCIe
>     Monish Chunara <monish.chunara@....qualcomm.com> - EEPROM.
> 
> Signed-off-by: Umang Chheda <umang.chheda@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile             |   4 +
>  .../boot/dts/qcom/lemans-evk-mezzanine.dtso   | 301 ++++++++++++++++++
>  2 files changed, 305 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/lemans-evk-mezzanine.dtso
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index f80b5d9cf1e8..79449004adfd 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -43,6 +43,10 @@ dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-camera.dtb
>  lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo
> 
>  dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-el2.dtb
> +
> +lemans-evk-mezzanine-dtbs	:= lemans-evk.dtb lemans-evk-mezzanine.dtbo
> +
> +dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-mezzanine.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= milos-fairphone-fp6.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8216-samsung-fortuna3g.dtb
> diff --git a/arch/arm64/boot/dts/qcom/lemans-evk-mezzanine.dtso b/arch/arm64/boot/dts/qcom/lemans-evk-mezzanine.dtso
> new file mode 100644
> index 000000000000..a0dc6daec754
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/lemans-evk-mezzanine.dtso
> @@ -0,0 +1,301 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +
> +&{/} {
> +	model = "Qualcomm Technologies, Inc. Lemans-evk Mezzanine";
> +
> +	vreg_sys_pwr: regulator-vreg-sys-pwr {
> +		compatible = "regulator-fixed";
> +		regulator-name = "VREG_SYS_PWR";
> +
> +		regulator-always-on;
> +		regulator-boot-on;

nit: usually we put these at the end

[...]

> +&tlmm {
> +	ethernet1_default: ethernet1-default-state {
> +		ethernet1_mdc: ethernet1-mdc-pins {

You can drop the labels for these inner entries, as you never
reference them

Konrad