linux-kernel - Re: [PATCH v3] arm64: dts: imx8mq-kontron-pitx-imx8m: remove off-on-delay-us for regulator-usdhc2-vmmc

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Date:   Mon, 24 Oct 2022 14:26:59 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Heiko Thiery <heiko.thiery@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH v3] arm64: dts: imx8mq-kontron-pitx-imx8m: remove
 off-on-delay-us for regulator-usdhc2-vmmc

Hi Heiko,

On 22-10-24, Heiko Thiery wrote:
> With that delay U-Boot is not able to store the environment variables in
> the SD card. Since the delay is not required it can be remove.

Now I'm curious, since this doesn't tell us the why, it just tell us
about the end result. I'm asking because the NXP EVKs have an issue with
the sd-card power line capacity and we need this delay to reach a level
which is marked as low within the sd-spec.

Regards,
  Marco


> Fixes: 5dbadc848259 (arm64: dts: fsl: add support for Kontron pitx-imx8m board)
> 
> Signed-off-by: Heiko Thiery <heiko.thiery@...il.com>
> ---
> v3:
>  - Improve commit message and explain why it is a fix (thanks to Fabio)
> 
> v2:
>  - add Fixes tag
> 
>  arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts b/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
> index a91c136797f6..21442e04a632 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
> @@ -51,7 +51,6 @@ reg_usdhc2_vmmc: regulator-usdhc2-vmmc {
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> -		off-on-delay-us = <20000>;
>  		enable-active-high;
>  	};
>  };
> -- 
> 2.30.2
> 
>