linux-kernel - Re: [PATCH v2 07/20] ARM: dts: imx7-colibri: fix 1.8V/UHS support

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Message-ID: <90509acd1da1aa85699952e012fa1034255f1a06.camel@toradex.com>
Date:   Mon, 5 Aug 2019 07:18:59 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "stefan@...er.ch" <stefan@...er.ch>
CC:     Max Krummenacher <max.krummenacher@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "michal.vokac@...ft.com" <michal.vokac@...ft.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Stefan Agner <stefan.agner@...adex.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-imx@....com" <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 07/20] ARM: dts: imx7-colibri: fix 1.8V/UHS support

On Fri, 2019-08-02 at 10:51 +0200, Stefan Agner wrote:
> On 2019-07-31 16:52, Philippe Schenker wrote:
> > On Wed, 2019-07-31 at 09:56 -0300, Fabio Estevam wrote:
> > > On Wed, Jul 31, 2019 at 9:38 AM Philippe Schenker
> > > <philippe.schenker@...adex.com> wrote:
> > > > From: Stefan Agner <stefan.agner@...adex.com>
> > > > 
> > > > Add pinmuxing and do not specify voltage restrictions in the
> > > > module level device tree.
> > > 
> > > It would be nice to explain the reason for doing this.
> > 
> > This commit is in preparation of another patch that didn't made into this
> > patchset (downstream stuff in there). But I will do another patch on top
> > that
> > will use this patch here. That should anyway be in mainline.
> 
> I guess what Fabio meant here is explain this patch.
> 
> The commit message really could be improved, e.g.:
> 
> Add pinmuxing and do not specify voltage restrictions for the usdhc
> instance
> available on the modules edge connector. This allows to use SD-cards
> with
> higher transfer modes if supported by the carrier board.
> 
> --
> Stefan

Ah, sorry Fabio. I indeed understood you wrong and thanks Stefan for clarifying.
I have the new message in for v3.

Philippe

> 
> > Philippe
> > 
> > > > Signed-off-by: Stefan Agner <stefan.agner@...adex.com>
> > > > Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> > > > ---
> > > > 
> > > > Changes in v2: None
> > > > 
> > > >  arch/arm/boot/dts/imx7-colibri.dtsi | 23 ++++++++++++++++++++++-
> > > >  1 file changed, 22 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi
> > > > b/arch/arm/boot/dts/imx7-
> > > > colibri.dtsi
> > > > index 16d1a1ed1aff..67f5e0c87fdc 100644
> > > > --- a/arch/arm/boot/dts/imx7-colibri.dtsi
> > > > +++ b/arch/arm/boot/dts/imx7-colibri.dtsi
> > > > @@ -326,7 +326,6 @@
> > > >  &usdhc1 {
> > > >         pinctrl-names = "default";
> > > >         pinctrl-0 = <&pinctrl_usdhc1 &pinctrl_cd_usdhc1>;
> > > > -       no-1-8-v;
> > > >         cd-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
> > > >         disable-wp;
> > > >         vqmmc-supply = <&reg_LDO2>;
> > > > @@ -671,6 +670,28 @@
> > > >                 >;
> > > >         };
> > > > 
> > > > +       pinctrl_usdhc1_100mhz: usdhc1grp_100mhz {
> > > > +               fsl,pins = <
> > > > +                       MX7D_PAD_SD1_CMD__SD1_CMD       0x5a
> > > > +                       MX7D_PAD_SD1_CLK__SD1_CLK       0x1a
> > > > +                       MX7D_PAD_SD1_DATA0__SD1_DATA0   0x5a
> > > > +                       MX7D_PAD_SD1_DATA1__SD1_DATA1   0x5a
> > > > +                       MX7D_PAD_SD1_DATA2__SD1_DATA2   0x5a
> > > > +                       MX7D_PAD_SD1_DATA3__SD1_DATA3   0x5a
> > > > +               >;
> > > > +       };
> > > > +
> > > > +       pinctrl_usdhc1_200mhz: usdhc1grp_200mhz {
> > > > +               fsl,pins = <
> > > > +                       MX7D_PAD_SD1_CMD__SD1_CMD       0x5b
> > > > +                       MX7D_PAD_SD1_CLK__SD1_CLK       0x1b
> > > > +                       MX7D_PAD_SD1_DATA0__SD1_DATA0   0x5b
> > > > +                       MX7D_PAD_SD1_DATA1__SD1_DATA1   0x5b
> > > > +                       MX7D_PAD_SD1_DATA2__SD1_DATA2   0x5b
> > > > +                       MX7D_PAD_SD1_DATA3__SD1_DATA3   0x5b
> > > > +               >;
> > > > +       };
> > > 
> > > You add the entries for 100MHz and 200MHz, but I don't see them being
> > > referenced anywhere.