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SubjectRe: [PATCH v4 1/2] dt-bindings: hwmon: Add ina3221 documentation
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On 09/22/2018 09:11 PM, Nicolin Chen wrote:
> 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>
> ---
> Changelog
> v3->v4:
> * Removed the attempt of putting labels in the node names
> * Added a new optional label property in the child node
> * Updated examples accordingly
> v2->v3:
> * Added a simple subject in the line 1
> * Fixed the shunt resistor value in the example
> v1->v2:
> * Dropped channel name properties
> * Added child node definitions.
> * * Added shunt resistor property in the child node
> * * Added status property to indicate connection status
> * * Changed to use child node name as the label of input source
>
> .../devicetree/bindings/hwmon/ina3221.txt | 42 +++++++++++++++++++
> 1 file changed, 42 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/hwmon/ina3221.txt
>
> diff --git a/Documentation/devicetree/bindings/hwmon/ina3221.txt b/Documentation/devicetree/bindings/hwmon/ina3221.txt
> new file mode 100644
> index 000000000000..7d90bfe34adb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/ina3221.txt
> @@ -0,0 +1,42 @@
> +Texas Instruments INA3221 Device Tree Bindings
> +
> +1) ina3221 node
> + Required properties:
> + - compatible: Must be "ti,ina3221"
> + - reg: I2C address
> +
> + = The node contains optional child nodes for three channels =
> + = Each child node describes the information of input source =
> +
> + Example:
> +
> + ina3221@40 {
> + compatible = "ti,ina3221";
> + reg = <0x40>;
> + [ child node definitions... ]
> + };
> +
> +2) child nodes
> + Required properties:
> + - input-id: Must be 1, 2 or 3
> +
> + Optional properties:
> + - input-label: Name of the input source
> + - shunt-resistor: Shunt resistor value in micro-Ohm
> + - status: Should be "disabled" if no input source
> +
> + Example:
> +
> + input1 {
> + input-id = <0x1>;

We'll have to find a better name for this. Feel free to look up examples in the
existing devicetree descriptions. The one that seems to be used most of the time
to indicate a channel index or id is "reg". It should also start with 0 - there
is no real reason for it to start with 1; it only makes the code more complex.

> + status = "disabled";
> + };
> + input2 {
> + input-id = <0x2>;
> + shunt-resistor = <5000>;

I would suggest shunt-resistor-micro-ohms as per
Documentation/devicetree/bindings/property-units.txt.

> + };
> + input3 {
> + input-id = <0x3>;
> + input-label = "VDD_5V";
> + shunt-resistor = <5000>;
> + };
>

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