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

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Date:   Fri, 02 Aug 2019 10:51:25 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Philippe Schenker <philippe.schenker@...adex.com>
Cc:     festevam@...il.com, s.hauer@...gutronix.de,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        kernel@...gutronix.de,
        Max Krummenacher <max.krummenacher@...adex.com>,
        mark.rutland@....com, devicetree@...r.kernel.org,
        michal.vokac@...ft.com, shawnguo@...nel.org,
        Stefan Agner <stefan.agner@...adex.com>,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 07/20] ARM: dts: imx7-colibri: fix 1.8V/UHS support

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

> 
> 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.