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Date:   Fri, 28 Oct 2022 16:41:08 +0200
From:   Marco Felsch <m.felsch@pengutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc:     robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        shawnguo@kernel.org, s.hauer@pengutronix.de,
        devicetree@vger.kernel.org, Peng Fan <peng.fan@nxp.com>,
        linux-kernel@vger.kernel.org, Haibo Chen <haibo.chen@nxp.com>,
        linux-imx@nxp.com, kernel@pengutronix.de, festevam@gmail.com,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V2 14/15] arm64: dts: imx8m[m, p]-evk: change to use
 off-on-delay-us in regulator
Message-ID: <20221028144108.3ytq77yxkc5f64jk@pengutronix.de>
References: <20221024031351.4135651-1-peng.fan@oss.nxp.com>
 <20221024031351.4135651-15-peng.fan@oss.nxp.com>
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On 22-10-24, Peng Fan (OSS) wrote:
> From: Haibo Chen <haibo.chen@nxp.com>
> 
> Some SD Card controller and power circuitry has increased capacitance,
> so the usual toggling of regulator to power the card off and on
> is insufficient.
> 
> According to SD spec, for sd card power reset operation, the sd card
> supply voltage needs to be lower than 0.5v and keep over 1ms, otherwise,
> next time power back the sd card supply voltage to 3.3v, sd card can't
> support SD3.0 mode again.
> 
> This patch add the off-on-delay-us, make sure the sd power reset behavior
> is align with the specification. Without this patch, when do quick system
> suspend/resume test, some sd card can't work at SD3.0 mode after system
> resume back.
> 
> Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-evk.dts  | 2 +-
>  arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 +
>  arch/arm64/boot/dts/freescale/imx8mq-evk.dts  | 1 +
>  3 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> index c93387fcd498..898735965ac9 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> @@ -22,7 +22,7 @@ reg_sd1_vmmc: sd1_regulator {
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&gpio2 10 GPIO_ACTIVE_HIGH>;
> -		off-on-delay = <20000>;

I can't find the "off-on-delay" property you're deleting here in
upstream.

> +		off-on-delay-us = <20000>;
>  		startup-delay-us = <100>;
>  		enable-active-high;
>  	};
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> index ce450965e837..fdbcd2483efc 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> @@ -56,6 +56,7 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> +		off-on-delay-us = <20000>;
>  		enable-active-high;
>  	};
>  
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> index 82387b9cb800..07d9fb2aacf8 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> @@ -46,6 +46,7 @@ reg_usdhc2_vmmc: regulator-vsd-3v3 {
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> +		off-on-delay-us = <20000>;
>  		enable-active-high;
>  	};
>  
> -- 
> 2.37.1
> 
> 
>