linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: Add ina3221 documentation

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Date:   Thu, 20 Sep 2018 17:45:07 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Nicolin Chen <nicoleotsuka@...il.com>, jdelvare@...e.com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     afd@...com, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: Add ina3221 documentation

On 09/20/2018 05:07 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@...il.com>
> ---
>   .../devicetree/bindings/hwmon/ina3221.txt     | 23 +++++++++++++++++++
>   1 file changed, 23 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..266c9586c9b1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/ina3221.txt
> @@ -0,0 +1,23 @@
> +ina3221 properties
> +
> +Required properties:
> +- compatible: Must be "ti,ina3221"
> +- reg: I2C address
> +
> +Optional properties:
> +
> +- ti,channel1-name:
> +- ti,channel2-name:
> +- ti,channel3-name:
> +	The names of the input sources (described in the schematics)
> +	Set the names with "NC" to indicate not-connected channels
> +

I don't really think this is a good idea - first to specify sensor
names this way, and much less specifying that "NC" means that a sensor
shall be disconnected/disabled.

Also, if we define devicetree support for this chip, it should include
all configuration options required to configure it. This should at
the very least include shunt resistor values.

Thanks,
Guenter

> +Example:
> +
> +ina3221@40 {
> +	compatible = "ti,ina3221";
> +	reg = <0x40>;
> +	ti,channel1-name = "NC";
> +	ti,channel2-name = "VDD_5V0_EXT";
> +	ti,channel3-name = "VDD_19V";
> +};
>