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dt-bindings: regulator: twl6030: Add retain-on-reset property

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During reset the VMMC regulator doesn't reach 0V and only drops to
1.8V, furthermore the pulse width is under 200us whereas the SD
specification expect 1ms.

For this 2 reasons being able to no reset at all the VMMC during warm
reset and keep the current voltage is a good workaround. The TWL6030
allows this but needs to be aware of it and this configuration should
also be shared with the bootloader.

This is the purpose of this new property: ti,retain-on-reset

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20190725094542.16547-2-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gregory CLEMENT 2019-07-25 11:45:40 +02:00 committed by Mark Brown
parent 610f29e5cc
commit 906c4d5c93
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1 changed files with 7 additions and 0 deletions
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7
Documentation/devicetree/bindings/regulator/twl-regulator.txt
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@ -71,3 +71,10 @@ Example:
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <3000000>;
};
For twl6030 regulators/LDOs:
- ti,retain-on-reset: Does not turn off the supplies during warm
reset. Could be needed for VMMC, as TWL6030
reset sequence for this signal does not comply
with the SD specification.