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 14:56:30 +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

On 22-10-24, Heiko Thiery wrote:
> Hi Marco,
> 
> Am Mo., 24. Okt. 2022 um 14:34 Uhr schrieb Marco Felsch
> <m.felsch@...gutronix.de>:
> >
> > 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.
> 
> I must admit that I do not know at all why this entry was made. I have
> now looked at the dtbs of the imx8 EVKs and except for imx8dxl-evk.dts
> I see no delay here.

Please see <20221024031351.4135651-10-peng.fan@....nxp.com>, they will
be added.

Regards,
  Marco