linux-kernel - RE: [PATCH] arm64: dts: imx93-9x9-qsb: add CAN support

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Message-ID:
 <DU0PR04MB94968BBFFF9FC757C177C14E90DFA@DU0PR04MB9496.eurprd04.prod.outlook.com>
Date: Thu, 27 Nov 2025 02:01:47 +0000
From: Bough Chen <haibo.chen@....com>
To: Frank Li <frank.li@....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" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] arm64: dts: imx93-9x9-qsb: add CAN support

> -----Original Message-----
> From: Frank Li <frank.li@....com>
> Sent: 2025年11月27日 0:22
> To: Bough Chen <haibo.chen@....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
> Subject: Re: [PATCH] arm64: dts: imx93-9x9-qsb: add CAN support
> 
> On Wed, Nov 26, 2025 at 02:20:07PM +0800, Haibo Chen wrote:
> 
> subject suggested,  add CAN support overlay file
> 
> > CAN1 and Micfil share pins on imx93-9x9-qsb board, use TMUX1574RSVR to
> > control the connection: put sel to high, select CAN1, put sel to low,
> > select Micfil. In default, sel keep low.
> >
> > To support CAN1, need to put the sel to high. Besides, CAN1 use phy
> > TJA1057GT/3.
> >
> > ---
> > Signed-off-by: Haibo Chen <haibo.chen@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/Makefile             |  2 +
> >  .../boot/dts/freescale/imx93-9x9-qsb-can1.dtso     | 63
> ++++++++++++++++++++++
> >  2 files changed, 65 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/Makefile
> > b/arch/arm64/boot/dts/freescale/Makefile
> > index
> >
> f30d3fd724d0ce6b38f7bef10e3970ac34f70f4a..1142d3312c8651b4292837bce3
> cb
> > e46ab95f7e09 100644
> > --- a/arch/arm64/boot/dts/freescale/Makefile
> > +++ b/arch/arm64/boot/dts/freescale/Makefile
> > @@ -373,7 +373,9 @@ dtb-$(CONFIG_ARCH_MXC) +=
> > imx91-tqma9131-mba91xxca.dtb
> >  dtb-$(CONFIG_ARCH_MXC) += imx93-9x9-qsb.dtb
> >
> >  imx93-9x9-qsb-i3c-dtbs += imx93-9x9-qsb.dtb imx93-9x9-qsb-i3c.dtbo
> > +imx93-9x9-qsb-can1-dtbs += imx93-9x9-qsb.dtb imx93-9x9-qsb-can1.dtbo
> 
> Keep order by alphabet.
> 
> >  dtb-$(CONFIG_ARCH_MXC) += imx93-9x9-qsb-i3c.dtb
> > +dtb-$(CONFIG_ARCH_MXC) += imx93-9x9-qsb-can1.dtb
> 
> the same here
> 
> can1 should before i3c.

Okay

> 
> >
> >  dtb-$(CONFIG_ARCH_MXC) += imx93-11x11-evk.dtb
> >  dtb-$(CONFIG_ARCH_MXC) += imx93-14x14-evk.dtb diff --git
> > a/arch/arm64/boot/dts/freescale/imx93-9x9-qsb-can1.dtso
> > b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb-can1.dtso
> > new file mode 100644
> > index
> >
> 0000000000000000000000000000000000000000..62d4fa6c21d794f91da59f51
> 1d6f
> > 0162037e9271
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb-can1.dtso
> > @@ -0,0 +1,63 @@
> ...
> > +
> > +&pcal6524 {
> > +	/*
> > +	 * mic-can-sel-hog have property 'output-low', dt overlay don't
> > +	 * support /delete-property/. Both 'output-low' and 'output-high'
> > +	 * will be exist under hog nodes if overlay file set 'output-high'.
> > +	 * Workaround is disable this hog and create new hog with
> > +	 * 'output-high'.
> > +	 */
> > +	mic-can-sel-hog {
> > +		status = "disabled";
> > +	};
> 
> are you sure 'status' work for hogs?

Yes, I test on board, this method works.

Any better solution?

Regards
Haibo Chen
> 
> Frank
> > +
> > +	/*
> > +	 * Config the MIC/CAN_SEL to high, chose B
> > +	 * port, connect to CAN.
> > +	 */
> > +	mic-can-high-sel-hog {
> > +		gpio-hog;
> > +		gpios = <0x11 0x00>;
> > +		output-high;
> > +	};
> > +};
> >
> > ---
> > base-commit: 422f3140bbcb657e1b86c484296972ab76f6d1ff
> > change-id: 20251125-b4-9391-can-dts-2f4849978fc2
> >
> > Best regards,
> > --
> > Haibo Chen <haibo.chen@....com>
> >