linux-kernel - [PATCH v2 3/8] dt-bindings: mfd: axp20x: add support for regulator-ramp-delay for AXP209

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Message-Id: <78eafc64831c50005fe5d186c174440d48a865e3.1544512919.git-series.plaes@plaes.org>
Date:   Tue, 11 Dec 2018 17:17:07 +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 v2 3/8] dt-bindings: mfd: axp20x: add support for regulator-ramp-delay for AXP209

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

The AXP209 supports ramping up voltages on several regulators such as
DCDC2 and LDO3, therefore we can use the standard 'regulator-ramp-delay'
property for those 2 regulators.

Note that the voltage ramp only works when the regulator is already
enabled. E.g. when going from say 0.7 V to 3.6 V.

When turning on the regulator, no voltage ramp is performed in hardware.

What this means, is that if the bootloader brings up the voltage at 0.7 V,
the ramp delay property is properly applied. If however, the bootloader
leaves the power off, no ramp delay is applied when the power is
enabled by the regulator framework.

Signed-off-by: Olliver Schinagl <oliver@...inagl.nl>
Signed-off-by: Priit Laes <plaes@...es.org>
Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
---
 Documentation/devicetree/bindings/mfd/axp20x.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/axp20x.txt b/Documentation/devicetree/bindings/mfd/axp20x.txt
index 188f037..c626605 100644
--- a/Documentation/devicetree/bindings/mfd/axp20x.txt
+++ b/Documentation/devicetree/bindings/mfd/axp20x.txt
@@ -32,6 +32,12 @@ Required properties:
 - interrupt-controller: The PMIC has its own internal IRQs
 - #interrupt-cells: Should be set to 1
 
+Supported common regulator properties, see ../regulator/regulator.txt for
+more information:
+- regulator-ramp-delay: sets the ramp up delay in uV/us
+			AXP20x/DCDC2: 1600, 800
+			AXP20x/LDO3:  1600, 800
+
 Optional properties:
 - x-powers,dcdc-freq: defines the work frequency of DC-DC in KHz
 		      AXP152/20X: range:  750-1875, Default: 1.5 MHz
-- 
git-series 0.9.1