linux-kernel - [PATCH] ARM: dts: imx6q-logicpd: Reduce inrush current on USBH1

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Date:   Tue,  2 Apr 2019 14:32:04 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     adam.ford@...icpd.com, Adam Ford <aford173@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        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: [PATCH] ARM: dts: imx6q-logicpd: Reduce inrush current on USBH1

Some USB peripherals draw more power, and the sourcing regulator
take a little time to turn on.  This patch fixes an issue where
some devices occasionally do not get detected, because the power
isn't quite ready when communication starts, so we add a bit
of a delay.

Fixes: 1c207f911fe9 ("ARM: dts: imx: Add support for Logic PD
i.MX6QD EVM")

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

diff --git a/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi b/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
index db6b5b900826..7731db493cb0 100644
--- a/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
+++ b/arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi
@@ -88,6 +88,7 @@
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
 		gpio = <&gpio7 12 GPIO_ACTIVE_HIGH>;
+		startup-delay-us = <70000>;
 		enable-active-high;
 	};
 
-- 
2.17.1