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

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Date:   Wed, 31 Jul 2019 09:56:05 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Philippe Schenker <philippe.schenker@...adex.com>
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michal Vokáč <michal.vokac@...ft.com>,
        Stefan Agner <stefan.agner@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH v2 07/20] ARM: dts: imx7-colibri: fix 1.8V/UHS support

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.

> 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.