linux-kernel - Re: [PATCH 1/2] arm64: dts: imx91-tqma9131: improve eMMC pad configuration

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Message-ID: <aYoy_-v_T-cIHocM@lizhi-Precision-Tower-5810>
Date: Mon, 9 Feb 2026 14:18:23 -0500
From: Frank Li <Frank.li@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Shawn Guo <shawnguo@...nel.org>,
	Markus Niebel <Markus.Niebel@...tq-group.com>,
	linux@...tq-group.com, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: imx91-tqma9131: improve eMMC pad
 configuration

On Mon, Feb 09, 2026 at 04:50:13PM +0100, Alexander Stein wrote:
> From: Markus Niebel <Markus.Niebel@...tq-group.com>
>
> Use DSE x4 an PullUp for CMD an DAT, DSE x4 and PullDown for CLK.
> This improves stability and detection at low temperatures under -25°C.
>
> Fixes: e71db39f0c7c ("arm64: dts: freescale: add initial device tree for TQMa91xx/MBa91xxCA")
> Signed-off-by: Markus Niebel <Markus.Niebel@...tq-group.com>
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
Reviewed-by: Frank Li <Frank.Li@....com>
>  .../boot/dts/freescale/imx91-tqma9131.dtsi    | 20 +++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx91-tqma9131.dtsi b/arch/arm64/boot/dts/freescale/imx91-tqma9131.dtsi
> index 5792952b7a8e1..c99d7bc168483 100644
> --- a/arch/arm64/boot/dts/freescale/imx91-tqma9131.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx91-tqma9131.dtsi
> @@ -272,20 +272,20 @@ pinctrl_reg_usdhc2_vmmc: regusdhc2vmmcgrp {
>  	/* enable SION for data and cmd pad due to ERR052021 */
>  	pinctrl_usdhc1: usdhc1grp {
>  		fsl,pins = /* PD | FSEL 3 | DSE X5 */
> -			   <MX91_PAD_SD1_CLK__USDHC1_CLK		0x5be>,
> +			   <MX91_PAD_SD1_CLK__USDHC1_CLK		0x59e>,
>  			   /* HYS | FSEL 0 | no drive */
>  			   <MX91_PAD_SD1_STROBE__USDHC1_STROBE		0x1000>,
>  			   /* HYS | FSEL 3 | X5 */
> -			   <MX91_PAD_SD1_CMD__USDHC1_CMD		0x400011be>,
> +			   <MX91_PAD_SD1_CMD__USDHC1_CMD		0x4000139e>,
>  			   /* HYS | FSEL 3 | X4 */
> -			   <MX91_PAD_SD1_DATA0__USDHC1_DATA0		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA1__USDHC1_DATA1		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA2__USDHC1_DATA2		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA3__USDHC1_DATA3		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA4__USDHC1_DATA4		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA5__USDHC1_DATA5		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA6__USDHC1_DATA6		0x4000119e>,
> -			   <MX91_PAD_SD1_DATA7__USDHC1_DATA7		0x4000119e>;
> +			   <MX91_PAD_SD1_DATA0__USDHC1_DATA0		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA1__USDHC1_DATA1		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA2__USDHC1_DATA2		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA3__USDHC1_DATA3		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA4__USDHC1_DATA4		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA5__USDHC1_DATA5		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA6__USDHC1_DATA6		0x4000139e>,
> +			   <MX91_PAD_SD1_DATA7__USDHC1_DATA7		0x4000139e>;
>  	};
>
>  	pinctrl_wdog: wdoggrp {
> --
> 2.43.0
>