linux-kernel - RE: [PATCH] arm64: dts: imx943-evk: add usdhc3 for SDIO WiFi support

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Message-ID:
 <VI0PR04MB121149BC7728CBDCA55B1F6599298A@VI0PR04MB12114.eurprd04.prod.outlook.com>
Date: Wed, 4 Feb 2026 02:12:26 +0000
From: Sherry Sun <sherry.sun@....com>
To: Frank Li <frank.li@....com>
CC: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "festevam@...il.com"
	<festevam@...il.com>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] arm64: dts: imx943-evk: add usdhc3 for SDIO WiFi support

> On Tue, Feb 03, 2026 at 05:14:59PM +0800, Sherry Sun wrote:
> > Add usdhc3 to support M.2 SDIO WiFi on i.MX943 EVK board.
> >
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx943-evk.dts | 63
> ++++++++++++++++++++
> >  1 file changed, 63 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx943-evk.dts
> b/arch/arm64/boot/dts/freescale/imx943-evk.dts
> > index f54404c9bfc9..8f4f6875d036 100644
> > --- a/arch/arm64/boot/dts/freescale/imx943-evk.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx943-evk.dts
> > @@ -20,6 +20,7 @@ aliases {
> >  		i2c5 = &lpi2c6;
> >  		mmc0 = &usdhc1;
> >  		mmc1 = &usdhc2;
> > +		mmc2 = &usdhc3;
> >  		serial0 = &lpuart1;
> >  		serial5 = &lpuart6;
> >  	};
> > @@ -54,6 +55,33 @@ dmic: dmic {
> >  		#sound-dai-cells = <0>;
> >  	};
> >
> > +	reg_m2_pwr: regulator-m2-pwr {
> > +		compatible = "regulator-fixed";
> > +		regulator-name = "M.2-power";
> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +		gpio = <&pcal6416_i2c3_u46 2 GPIO_ACTIVE_HIGH>;
> > +		enable-active-high;
> > +		/*
> > +		 * M.2 device only can be enabled(W_DISABLE1#) after all
> Power
> > +		 * Rails reach their minimum operating voltage (PCI Express
> M.2
> > +		 * Specification r5.1 3.1.4 Power-up Timing).
> > +		 * Set a delay equal to the max value of Tsettle here.
> > +		 */
> > +		startup-delay-us = <5000>;
> > +	};
> > +
> > +	reg_m2_wlan: regulator-wlan {
> > +		compatible = "regulator-fixed";
> > +		regulator-name = "WLAN_EN";
> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +		vin-supply = <&reg_m2_pwr>;
> > +		gpio = <&pcal6416_i2c3_u46 5 GPIO_ACTIVE_HIGH>;
> > +		enable-active-high;
> > +	};
> > +
> > +
> >  	reg_usdhc2_vmmc: regulator-usdhc2 {
> >  		compatible = "regulator-fixed";
> >  		off-on-delay-us = <12000>;
> > @@ -145,6 +173,12 @@ memory@...00000 {
> >  		reg = <0x0 0x80000000 0x0 0x80000000>;
> >  		device_type = "memory";
> >  	};
> > +
> > +	usdhc3_pwrseq: usdhc3_pwrseq {
> > +		compatible = "mmc-pwrseq-simple";
> > +		reset-gpios = <&pcal6416_i2c3_u46 4 GPIO_ACTIVE_LOW>;
> > +	};
> > +
> 
> put usdhc3_pwrseq before @hexvalue nodes.

Thanks, will fix in V2.

Best Regards
Sherry

> 
> Frank
> >  };
> >
> >  &enetc1 {
> > @@ -760,6 +794,18 @@ IMX94_PAD_SD2_RESET_B__GPIO4_IO27	0x31e
> >  		>;
> >  	};
> >
> > +	pinctrl_usdhc3: usdhc3grp {
> > +		fsl,pins = <
> > +			IMX94_PAD_GPIO_IO48__USDHC3_CLK
> 	0x158e
> > +			/* Need to config the SION for CMD pad, refer to
> ERR053138 */
> > +			IMX94_PAD_GPIO_IO49__USDHC3_CMD
> 	0x4000138e
> > +			IMX94_PAD_GPIO_IO50__USDHC3_DATA0
> 	0x138e
> > +			IMX94_PAD_GPIO_IO51__USDHC3_DATA1
> 	0x138e
> > +			IMX94_PAD_GPIO_IO52__USDHC3_DATA2
> 	0x138e
> > +			IMX94_PAD_GPIO_IO53__USDHC3_DATA3
> 	0x138e
> > +		>;
> > +	};
> > +
> >  	pinctrl_xspi1: xspi1grp {
> >  		fsl,pins = <
> >  			IMX94_PAD_XSPI1_SCLK__XSPI1_A_SCLK	0x3fe
> > @@ -802,6 +848,23 @@ &usdhc2 {
> >  	status = "okay";
> >  };
> >
> > +&usdhc3 {
> > +	/*
> > +	 * Only enable SDIO2.0 mode as the corresponding GPIO pads are
> 3.3V, the
> > +	 * max frequency is 50MHz.
> > +	 */
> > +	pinctrl-0 = <&pinctrl_usdhc3>;
> > +	pinctrl-1 = <&pinctrl_usdhc3>;
> > +	pinctrl-names = "default", "sleep";
> > +	bus-width = <4>;
> > +	vmmc-supply = <&reg_m2_wlan>;
> > +	mmc-pwrseq = <&usdhc3_pwrseq>;
> > +	keep-power-in-suspend;
> > +	non-removable;
> > +	wakeup-source;
> > +	status = "okay";
> > +};
> > +
> >  &wdog3 {
> >  	fsl,ext-reset-output;
> >  	status = "okay";
> > --
> > 2.37.1
> >