linux-kernel - Re: [PATCH v4 11/21] ARM: dts: imx6qdl-apalis: Add sleep state to can interfaces

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Message-ID: <4c318f310babcf655be8db79abcfce547daea284.camel@toradex.com>
Date:   Wed, 21 Aug 2019 13:15:53 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "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>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-imx@....com" <linux-imx@....com>
Subject: Re: [PATCH v4 11/21] ARM: dts: imx6qdl-apalis: Add sleep state to can
 interfaces

On Mon, 2019-08-19 at 13:27 +0200, Shawn Guo wrote:
> On Mon, Aug 12, 2019 at 02:21:31PM +0000, Philippe Schenker wrote:
> > This patch prepares the devicetree for the new Ixora V1.2 where we
> > are
> > able to turn off the supply of the can transceiver. This implies to
> > use
> > a sleep state on transmission pins in order to prevent backfeeding.
> > 
> > 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: None
> > Changes in v2:
> > - Changed commit title to '...imx6qdl-apalis:...'
> > 
> >  arch/arm/boot/dts/imx6qdl-apalis.dtsi | 27 +++++++++++++++++++++---
> > ---
> >  1 file changed, 21 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > index 7c4ad541c3f5..59ed2e4a1fd1 100644
> > --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > @@ -148,14 +148,16 @@
> >  };
> >  
> >  &can1 {
> > -	pinctrl-names = "default";
> > -	pinctrl-0 = <&pinctrl_flexcan1>;
> 
> This line doesn't need to be changed.

You're right, but by adding pinctrl_flexcan1_sleep here, I'd like to
emphasize between "default" and "sleep" and change that.

Since it's only used in this file I don't see any problems.

Philippe
> 
> > +	pinctrl-names = "default", "sleep";
> > +	pinctrl-0 = <&pinctrl_flexcan1_default>;
> > +	pinctrl-1 = <&pinctrl_flexcan1_sleep>;
> >  	status = "disabled";
> >  };
> >  
> >  &can2 {
> > -	pinctrl-names = "default";
> > -	pinctrl-0 = <&pinctrl_flexcan2>;
> > +	pinctrl-names = "default", "sleep";
> > +	pinctrl-0 = <&pinctrl_flexcan2_default>;
> > +	pinctrl-1 = <&pinctrl_flexcan2_sleep>;
> >  	status = "disabled";
> >  };
> >  
> > @@ -599,19 +601,32 @@
> >  		>;
> >  	};
> >  
> > -	pinctrl_flexcan1: flexcan1grp {
> 
> Ditto.  I take them as unnecessary changes.
> 
> Shawn
> 
> > +	pinctrl_flexcan1_default: flexcan1defgrp {
> >  		fsl,pins = <
> >  			MX6QDL_PAD_GPIO_7__FLEXCAN1_TX 0x1b0b0
> >  			MX6QDL_PAD_GPIO_8__FLEXCAN1_RX 0x1b0b0
> >  		>;
> >  	};
> >  
> > -	pinctrl_flexcan2: flexcan2grp {
> > +	pinctrl_flexcan1_sleep: flexcan1slpgrp {
> > +		fsl,pins = <
> > +			MX6QDL_PAD_GPIO_7__GPIO1_IO07 0x0
> > +			MX6QDL_PAD_GPIO_8__GPIO1_IO08 0x0
> > +		>;
> > +	};
> > +
> > +	pinctrl_flexcan2_default: flexcan2defgrp {
> >  		fsl,pins = <
> >  			MX6QDL_PAD_KEY_COL4__FLEXCAN2_TX 0x1b0b0
> >  			MX6QDL_PAD_KEY_ROW4__FLEXCAN2_RX 0x1b0b0
> >  		>;
> >  	};
> > +	pinctrl_flexcan2_sleep: flexcan2slpgrp {
> > +		fsl,pins = <
> > +			MX6QDL_PAD_KEY_COL4__GPIO4_IO14 0x0
> > +			MX6QDL_PAD_KEY_ROW4__GPIO4_IO15 0x0
> > +		>;
> > +	};
> >  
> >  	pinctrl_gpio_bl_on: gpioblon {
> >  		fsl,pins = <
> > -- 
> > 2.22.0
> >