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dt-bindings: arm: Add support for SCMI Regulators

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Add devicetree bindings to support regulators based on SCMI Voltage
Domain Protocol.

Link: https://lore.kernel.org/r/20201119191051.46363-5-cristian.marussi@arm.com
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2020-11-19 19:10:50 +00:00 committed by Sudeep Holla
parent 3cea11cd5e
commit 0f80fcec08
1 changed files with 43 additions and 0 deletions
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43
Documentation/devicetree/bindings/arm/arm,scmi.txt
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@ -62,6 +62,29 @@ Required properties:
- #power-domain-cells : Should be 1. Contains the device or the power
domain ID value used by SCMI commands.
Regulator bindings for the SCMI Regulator based on SCMI Message Protocol
------------------------------------------------------------
An SCMI Regulator is permanently bound to a well defined SCMI Voltage Domain,
and should be always positioned as a root regulator.
It does not support any current operation.
SCMI Regulators are grouped under a 'regulators' node which in turn is a child
of the SCMI Voltage protocol node inside the desired SCMI instance node.
This binding uses the common regulator binding[6] but, due to SCMI abstractions,
supports only a subset of its properties as specified below amongst Optional
properties.
Required properties:
- reg : shall identify an existent SCMI Voltage Domain.
Optional properties:
- regulator-name
- regulator-min-microvolt / regulator-max-microvolt
- regulator-always-on / regulator-boot-on
- regulator-max-step-microvolt
- regulator-coupled-with / regulator-coupled-max-spread
Sensor bindings for the sensors based on SCMI Message Protocol
--------------------------------------------------------------
SCMI provides an API to access the various sensors on the SoC.
@ -105,6 +128,7 @@ Required sub-node properties:
[3] Documentation/devicetree/bindings/thermal/thermal*.yaml
[4] Documentation/devicetree/bindings/sram/sram.yaml
[5] Documentation/devicetree/bindings/reset/reset.txt
[6] Documentation/devicetree/bindings/regulator/regulator.yaml
Example:
@ -169,6 +193,25 @@ firmware {
reg = <0x16>;
#reset-cells = <1>;
};
scmi_voltage: protocol@17 {
reg = <0x17>;
regulators {
regulator_devX: regulator@0 {
reg = <0x0>;
regulator-max-microvolt = <3300000>;
};
regulator_devY: regulator@9 {
reg = <0x9>;
regulator-min-microvolt = <500000>;
regulator-max-microvolt = <4200000>;
};
...
};
};
};
};