linux-kernel - Re: [PATCH v4 07/21] ARM: dts: imx7-colibri: fix 1.8V/UHS support

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Date:   Wed, 21 Aug 2019 12:49:50 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "stefan@...er.ch" <stefan@...er.ch>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "michal.vokac@...ft.com" <michal.vokac@...ft.com>,
        Stefan Agner <stefan.agner@...adex.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-imx@....com" <linux-imx@....com>
Subject: Re: [PATCH v4 07/21] ARM: dts: imx7-colibri: fix 1.8V/UHS support

On Mon, 2019-08-19 at 13:18 +0200, Shawn Guo wrote:
> On Mon, Aug 12, 2019 at 02:21:25PM +0000, Philippe Schenker wrote:
> > From: Stefan Agner <stefan.agner@...adex.com>
> > 
> > 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.
> > 
> > Signed-off-by: Stefan Agner <stefan.agner@...adex.com>
> > Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> > Acked-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> > 
> > ---
> > 
> > Changes in v4:
> > - Add Marcel Ziswiler's Ack
> > 
> > Changes in v3:
> > - Add new commit message from Stefan's proposal on ML
> > 
> > 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 5347ed38acb2..c563bb821b5e 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 {
> 
> No reference to them from usdhc1 node?
> 
> Shawn

No. I'd like to have that pinmuxing prepared for someone to add UHS
support to SD. Primary functionality of that pins is something else so
this will have priority.

Philippe

> 
> > +		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
> > +		>;
> > +	};
> > +
> >  	pinctrl_usdhc3: usdhc3grp {
> >  		fsl,pins = <
> >  			MX7D_PAD_SD3_CMD__SD3_CMD		0x59
> > -- 
> > 2.22.0
> >