linux-kernel - Re: [PATCH 2/3] ARM: DTS: imx6q-logicpd: Reduce inrush current on start

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Message-ID: <20190320124446.GO4980@dragon>
Date:   Wed, 20 Mar 2019 20:44:48 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ARM: DTS: imx6q-logicpd: Reduce inrush current on
 start

On Wed, Mar 06, 2019 at 08:04:00AM -0600, Adam Ford wrote:
> The main 3.3V regulator sources a series of additional regulators.
> This patch adds a small delay, so when the 3.3V regulator comes
> on it delays a bit before the subsequent regulators can come on.
> This reduces the inrush current a bit on the external DC power
> supply.
> 
> Fixes: 1c207f911fe9 ("ARM: dts: imx: Add support for Logic PD
> i.MX6QD EVM")

Same comment as patch #1.

> 
> Signed-off-by: Adam Ford <aford173@...il.com>

To match the convention, the 'DTS' in subject prefix should be
lowercase.

Shawn

> 
> diff --git a/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi b/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
> index fb01fa6e4224..e31b6923cb72 100644
> --- a/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
> +++ b/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
> @@ -99,6 +99,7 @@
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&gpio1 26 GPIO_ACTIVE_HIGH>;
> +		startup-delay-us = <70000>;
>  		enable-active-high;
>  		regulator-always-on;
>  	};
> -- 
> 2.17.1
>