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dt-bindings: hwmon: Add ina3221 documentation
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Texas Instruments INA3221 is a triple-channel shunt and bus
voltage monitor. This patch adds a DT binding doc for it.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Nicolin Chen authored and Guenter Roeck committed Oct 11, 2018
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44 changes: 44 additions & 0 deletions Documentation/devicetree/bindings/hwmon/ina3221.txt
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Texas Instruments INA3221 Device Tree Bindings

1) ina3221 node
Required properties:
- compatible: Must be "ti,ina3221"
- reg: I2C address

Optional properties:
= The node contains optional child nodes for three channels =
= Each child node describes the information of input source =

- #address-cells: Required only if a child node is present. Must be 1.
- #size-cells: Required only if a child node is present. Must be 0.

2) child nodes
Required properties:
- reg: Must be 0, 1 or 2, corresponding to IN1, IN2 or IN3 port of INA3221

Optional properties:
- label: Name of the input source
- shunt-resistor-micro-ohms: Shunt resistor value in micro-Ohm

Example:

ina3221@40 {
compatible = "ti,ina3221";
reg = <0x40>;
#address-cells = <1>;
#size-cells = <0>;

input@0 {
reg = <0x0>;
status = "disabled";
};
input@1 {
reg = <0x1>;
shunt-resistor-micro-ohms = <5000>;
};
input@2 {
reg = <0x2>;
label = "VDD_5V";
shunt-resistor-micro-ohms = <5000>;
};
};

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