Unverified Commit fdb0436c authored Dec 11, 2018 by Olliver Schinagl Committed by Mark Brown Dec 13, 2018

dt-bindings: mfd: axp20x: add support for regulator-ramp-delay for AXP209



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@schinagl.nl>
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent d29f54df

Documentation/devicetree/bindings/mfd/axp20x.txt

+6 −0

Original line number	Diff line number	Diff line
		@@ -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