linux-kernel - Re: [PATCH 1/2] arm64: dts: freescale: imx93-phyboard-nash: Add jtag overlay

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Message-ID: <aPt/d9svTeUIRljW@lizhi-Precision-Tower-5810>
Date: Fri, 24 Oct 2025 09:30:31 -0400
From: Frank Li <Frank.li@....com>
To: Primoz Fiser <primoz.fiser@...ik.com>
Cc: Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, upstream@...ts.phytec.de
Subject: Re: [PATCH 1/2] arm64: dts: freescale: imx93-phyboard-nash: Add jtag
 overlay

On Tue, Oct 07, 2025 at 10:40:27AM +0200, Primoz Fiser wrote:
> Add overlay to enable JTAG pins on the board's JTAG (X41) connector.
>
> Signed-off-by: Primoz Fiser <primoz.fiser@...ik.com>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |  2 ++
>  .../freescale/imx93-phyboard-nash-jtag.dtso   | 26 +++++++++++++++++++
>  2 files changed, 28 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index 525ef180481d..c72a6fdc5412 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -356,10 +356,12 @@ dtb-$(CONFIG_ARCH_MXC) += imx93-kontron-bl-osm-s.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin.dtb
>
> +imx93-phyboard-nash-jtag-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-jtag.dtbo
>  imx93-phyboard-nash-peb-wlbt-07-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-peb-wlbt-07.dtbo
>  imx93-phyboard-segin-peb-eval-01-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-eval-01.dtbo
>  imx93-phyboard-segin-peb-wlbt-05-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-wlbt-05.dtbo
>  imx93-phycore-rpmsg-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-segin.dtb imx93-phycore-rpmsg.dtbo
> +dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-jtag.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-peb-wlbt-07.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-eval-01.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-wlbt-05.dtb
> diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso
> new file mode 100644
> index 000000000000..4744eabf95f3
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso
> @@ -0,0 +1,26 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (C) 2025 PHYTEC Messtechnik GmbH
> + * Author: Primoz Fiser <primoz.fiser@...ik.com>
> + */
> +
> +#include "imx93-pinfunc.h"
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&gpio2 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_jtag>;
> +};

Use gpio to set pinctrl to no-gpio mode is strange. I am not sure if there
are better method, but at need comments here to show why have to do that.

Frank
> +
> +&iomuxc {
> +	pinctrl_jtag: jtaggrp {
> +		fsl,pins = <
> +			MX93_PAD_GPIO_IO24__JTAG_MUX_TDO	0x31e
> +			MX93_PAD_GPIO_IO25__JTAG_MUX_TCK	0x31e
> +			MX93_PAD_GPIO_IO26__JTAG_MUX_TDI	0x31e
> +			MX93_PAD_GPIO_IO27__JTAG_MUX_TMS	0x31e
> +		>;
> +	};
> +};
> --
> 2.34.1
>