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regulator: lochnagar: Add initial binding documentation

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Lochnagar is an evaluation and development board for Cirrus
Logic Smart CODEC and Amp devices. It allows the connection of
most Cirrus Logic devices on mini-cards, as well as allowing
connection of various application processor systems to provide a
full evaluation platform. This driver supports the board
controller chip on the Lochnagar board.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Charles Keepax 2018-11-20 14:16:28 +00:00 committed by Mark Brown
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Documentation/devicetree/bindings/regulator/cirrus,lochnagar.txt Normal file
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Cirrus Logic Lochnagar Audio Development Board
Lochnagar is an evaluation and development board for Cirrus Logic
Smart CODEC and Amp devices. It allows the connection of most Cirrus
Logic devices on mini-cards, as well as allowing connection of
various application processor systems to provide a full evaluation
platform. Audio system topology, clocking and power can all be
controlled through the Lochnagar, allowing the device under test
to be used in a variety of possible use cases.
This binding document describes the binding for the regulator portion
of the driver.
Also see these documents for generic binding information:
[1] Regulator: ../regulator/regulator.txt
This binding must be part of the Lochnagar MFD binding:
[2] ../mfd/cirrus,lochnagar.txt
Optional sub-nodes:
- VDDCORE : Initialisation data for the VDDCORE regulator, which
supplies the CODECs digital core if it has no build regulator for that
purpose.
Required Properties:
- compatible : One of the following strings:
"cirrus,lochnagar2-vddcore"
- SYSVDD-supply: Primary power supply for the Lochnagar.
- MICVDD : Initialisation data for the MICVDD regulator, which
supplies the CODECs MICVDD.
Required Properties:
- compatible : One of the following strings:
"cirrus,lochnagar2-micvdd"
- SYSVDD-supply: Primary power supply for the Lochnagar.
- MIC1VDD, MIC2VDD : Initialisation data for the MICxVDD supplies.
Required Properties:
- compatible : One of the following strings:
"cirrus,lochnagar2-mic1vdd", "cirrus,lochnagar2-mic2vdd"
Optional Properties:
- cirrus,micbias-input : A property selecting which of the CODEC
minicard micbias outputs should be used, valid values are 1 - 4.
- MICBIAS1-supply, MICBIAS2-supply: Regulator supplies for the
MICxVDD outputs, supplying the digital microphones, normally
supplied from the attached CODEC.
- VDD1V8 : Recommended fixed regulator for the VDD1V8 regulator, which supplies the
CODECs analog and 1.8V digital supplies.
Required Properties:
- compatible : Should be set to "regulator-fixed"
- regulator-min-microvolt : Should be set to 1.8V
- regulator-max-microvolt : Should be set to 1.8V
- regulator-boot-on
- regulator-always-on
- vin-supply : Should be set to same supply as SYSVDD
Example:
lochnagar {
lochnagar-micvdd: MICVDD {
compatible = "cirrus,lochnagar2-micvdd";
SYSVDD-supply = <&wallvdd>;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
};
lochnagar-vdd1v8: VDD1V8 {
compatible = "regulator-fixed";
regulator-name = "VDD1V8";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
vin-supply = <&wallvdd>;
};
};