* [PATCH V2] ARM: dts: imx6q-logicpd: Reduce inrush current on start
@ 2019-04-02 19:19 Adam Ford
2019-04-11 5:45 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Adam Ford @ 2019-04-02 19:19 UTC (permalink / raw)
To: linux-arm-kernel
Cc: adam.ford, Adam Ford, Rob Herring, Mark Rutland, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
NXP Linux Team, devicetree, linux-kernel
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@gmail.com>
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V2] ARM: dts: imx6q-logicpd: Reduce inrush current on start
2019-04-02 19:19 [PATCH V2] ARM: dts: imx6q-logicpd: Reduce inrush current on start Adam Ford
@ 2019-04-11 5:45 ` Shawn Guo
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2019-04-11 5:45 UTC (permalink / raw)
To: Adam Ford
Cc: linux-arm-kernel, adam.ford, Rob Herring, Mark Rutland,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
NXP Linux Team, devicetree, linux-kernel
On Tue, Apr 02, 2019 at 02:19:08PM -0500, 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 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@gmail.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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