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

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Date:   Mon, 19 Aug 2019 13:27:55 +0200
From:   Shawn Guo <shawnguo@...nel.org>
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>,
        Mark Rutland <mark.rutland@....com>,
        Michal Vokáč <michal.vokac@...ft.com>,
        Fabio Estevam <festevam@...il.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 v4 11/21] ARM: dts: imx6qdl-apalis: Add sleep state to
 can interfaces

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.

> +	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
>