linux-kernel - [PATCH 5.1 122/122] ARM: dts: imx6q-logicpd: Reduce inrush current on start

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Message-Id: <20190523181721.785614665@linuxfoundation.org>
Date:   Thu, 23 May 2019 21:07:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adam Ford <aford173@...il.com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH 5.1 122/122] ARM: dts: imx6q-logicpd: Reduce inrush current on start

From: Adam Ford <aford173@...il.com>

commit dbb58e291cd47e594b64293bd91a4ce40626513c upstream.

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 to help prevent a situation where the sourcing power supply
cannot source enough current and overloads and the kit fails to
start.

Fixes: 1c207f911fe9 ("ARM: dts: imx: Add support for Logic PD i.MX6QD EVM")
Signed-off-by: Adam Ford <aford173@...il.com>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
+++ b/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
@@ -100,6 +100,7 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 		gpio = <&gpio1 26 GPIO_ACTIVE_HIGH>;
+		startup-delay-us = <70000>;
 		enable-active-high;
 		regulator-always-on;
 	};