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regulator: added support for suspend states

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Some systems need to set regulators to specific states when they enter
low power modes, especially around CPUs. There are many of these modes
depending on the particular runtime state.

Currently the regulator consumers are not granted permission to change
suspend state of regulator devices, the constraints are configured at
startup.  In order to allow changes in a vlotage range, we need to add
new properties for voltage range and a flag to give permission to
change the suspend voltage and suspend on/off in suspend mode.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chunyan Zhang 2018-01-26 21:08:43 +08:00 committed by Mark Brown
parent 4fbd8d194f
commit 057c76440c
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1 changed files with 10 additions and 2 deletions
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12
Documentation/devicetree/bindings/regulator/regulator.txt
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@ -42,8 +42,16 @@ Optional properties:
- regulator-state-[mem/disk] node has following common properties:
- regulator-on-in-suspend: regulator should be on in suspend state.
- regulator-off-in-suspend: regulator should be off in suspend state.
- regulator-suspend-microvolt: regulator should be set to this voltage
in suspend.
- regulator-suspend-min-microvolt: minimum voltage may be set in
suspend state.
- regulator-suspend-max-microvolt: maximum voltage may be set in
suspend state.
- regulator-suspend-microvolt: the default voltage which regulator
would be set in suspend. This property is now deprecated, instead
setting voltage for suspend mode via the API which regulator
driver provides is recommended.
- regulator-changeable-in-suspend: whether the default voltage and
the regulator on/off in suspend can be changed in runtime.
- regulator-mode: operating mode in the given suspend state.
The set of possible operating modes depends on the capabilities of
every hardware so the valid modes are documented on each regulator