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

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Message-ID: <CAEyMn7ZVT+jR1sH6-RB8C6GnLF4bYvnd8f154AGKKZiPzmGbDA@mail.gmail.com>
Date:   Mon, 24 Oct 2022 15:07:57 +0200
From:   Heiko Thiery <heiko.thiery@...il.com>
To:     Marco Felsch <m.felsch@...gutronix.de>
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 Marco,

Am Mo., 24. Okt. 2022 um 14:58 Uhr schrieb Marco Felsch
<m.felsch@...gutronix.de>:
>
> 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.

I think I have to re-check that and especially why U-Boot is not able
with that setting to access the SD card for writing the environment.

Thanks!

>
> Regards,
>   Marco