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

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Message-ID: <aYI1QN6g/DbtfIz+@lizhi-Precision-Tower-5810>
Date: Tue, 3 Feb 2026 12:49:52 -0500
From: Frank Li <Frank.li@....com>
To: Sherry Sun <sherry.sun@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	s.hauer@...gutronix.de, festevam@...il.com, imx@...ts.linux.dev,
	kernel@...gutronix.de, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.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.

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
>