diff mbox series

[5/8] dt-bindings: mfd: axp20x: Add software based soft_start for AXP209 LDO3

Message ID 25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544466940.git-series.plaes@plaes.org (mailing list archive)
State New, archived
Headers show
Series This is a second edition of a series that implements voltage | expand

Commit Message

Priit Laes Dec. 10, 2018, 6:42 p.m. UTC 
From: Olliver Schinagl <oliver@schinagl.nl>

In the past, there have been words on various lists that if LDO3 is
disabled in u-boot, but enabled in the DTS, the axp209 driver would
fail to continue/hang. Several enable/disable patches have been
issues to devicetree's in both the kernel and u-boot to address
this issue.

What really happened however, was that the AXP209 shuts down without
a notice and without setting an interrupt. This is caused when LDO3
gets overloaded, for example with large capacitors on the LDO3 output.

Normally, we would expect that AXP209 would source 200 mA as per
datasheet and set and trigger an interrupt when being overloaded.
For some reason however, this does not happen.

As a work-around, implement software-based 'regulator-soft-start'
property for AXP209 LDO3 regulator, which is used to first bring up
the LDO3 to the lowest possible voltage and then enable the LDO.

After that, we can set the requested voltage as usual.

Combining this setting with the regulator-ramp-delay allows LDO3 to
come up slowly and staggered, potentially reducing overall inrush current.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Priit Laes <plaes@plaes.org>
---
 Documentation/devicetree/bindings/mfd/axp20x.txt | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/mfd/axp20x.txt b/Documentation/devicetree/bindings/mfd/axp20x.txt
index c626605..2af4ff9 100644
--- a/Documentation/devicetree/bindings/mfd/axp20x.txt
+++ b/Documentation/devicetree/bindings/mfd/axp20x.txt
@@ -37,6 +37,9 @@  more information:
 - regulator-ramp-delay: sets the ramp up delay in uV/us
 			AXP20x/DCDC2: 1600, 800
 			AXP20x/LDO3:  1600, 800
+- regulator-soft-start:	enable the output at the lowest possible voltage and
+			only then set the desired voltage
+			AXP20x/LDO3: software-based implementation
 
 Optional properties:
 - x-powers,dcdc-freq: defines the work frequency of DC-DC in KHz