linux-kernel - [PATCH 6/8] regulator: dts: enable soft-start and ramp delay for the OLinuXino Lime2

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Date:   Mon, 10 Dec 2018 20:42:17 +0200
From:   Priit Laes <plaes@...es.org>
To:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Olliver Schinagl <oliver@...inagl.nl>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Cc:     Priit Laes <plaes@...es.org>
Subject: [PATCH 6/8] regulator: dts: enable soft-start and ramp delay for the OLinuXino Lime2

From: Olliver Schinagl <oliver@...inagl.nl>

The OLinuXino Lime2 has a big capacitor on its LDO3 output. It is
actually too large, causing the PMIC to shutdown when toggling the LDO3.

By enabling soft-start and ramp delay we increase the time for the
capacitor to charge lowering the current drain on the power regulator.

Signed-off-by: Olliver Schinagl <oliver@...inagl.nl>
Signed-off-by: Priit Laes <plaes@...es.org>
---
 arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
index 55c9086..4e1c590 100644
--- a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
+++ b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
@@ -232,6 +232,8 @@
 	regulator-min-microvolt = <2800000>;
 	regulator-max-microvolt = <2800000>;
 	regulator-name = "vddio-csi0";
+	regulator-soft-start;
+	regulator-ramp-delay = <1600>;
 };
 
 &reg_ldo4 {
-- 
git-series 0.9.1