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

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Message-ID: <aPuvYwwG5N84MwGA@lizhi-Precision-Tower-5810>
Date: Fri, 24 Oct 2025 12:54:59 -0400
From: Frank Li <Frank.li@....com>
To: Alberto Merciai <alb3rt0.m3rciai@...il.com>
Cc: Primoz Fiser <primoz.fiser@...ik.com>, 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 Fri, Oct 24, 2025 at 04:36:40PM +0200, Alberto Merciai wrote:
> On Fri, Oct 24, 2025 at 09:30:31AM -0400, Frank Li wrote:
> > 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.
> >
>
> In old imx6 platform we use pinctrl_hog for that purpose, is not?

It'd better than gpio, but I am not sure if pinctrl_hog still be supported
because I have not seen it for the long time.

Frank
>
> > 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
> > >
> >