linux-kernel - Re: [PATCH v1 2/2] ARM: dts: imx6q-apalis: add can power-up delay on ixora board

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Message-ID: <20231127025218.GR87953@dragon>
Date:   Mon, 27 Nov 2023 10:52:18 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Andrejs Cainikovs <andrejs.cainikovs@...il.com>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Andrejs Cainikovs <andrejs.cainikovs@...adex.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v1 2/2] ARM: dts: imx6q-apalis: add can power-up delay on
 ixora board

On Fri, Oct 20, 2023 at 05:30:22PM +0200, Andrejs Cainikovs wrote:
> From: Andrejs Cainikovs <andrejs.cainikovs@...adex.com>
> 
> Newer variants of Ixora boards require a power-up delay when powering up
> the CAN transceiver of up to 1ms.
> 
> Cc: stable@...r.kernel.org

Why is only the iMX6 change required for stable?

Shawn

> Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@...adex.com>
> ---
>  arch/arm/boot/dts/nxp/imx/imx6q-apalis-ixora-v1.2.dts | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/nxp/imx/imx6q-apalis-ixora-v1.2.dts b/arch/arm/boot/dts/nxp/imx/imx6q-apalis-ixora-v1.2.dts
> index 717decda0ceb..3ac7a4501620 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx6q-apalis-ixora-v1.2.dts
> +++ b/arch/arm/boot/dts/nxp/imx/imx6q-apalis-ixora-v1.2.dts
> @@ -76,6 +76,7 @@ reg_can1_supply: regulator-can1-supply {
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&pinctrl_enable_can1_power>;
>  		regulator-name = "can1_supply";
> +		startup-delay-us = <1000>;
>  	};
>  
>  	reg_can2_supply: regulator-can2-supply {
> @@ -85,6 +86,7 @@ reg_can2_supply: regulator-can2-supply {
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&pinctrl_enable_can2_power>;
>  		regulator-name = "can2_supply";
> +		startup-delay-us = <1000>;
>  	};
>  };
>  
> -- 
> 2.34.1
>