Re: [PATCH v2 2/2] hwmon: Add driver for Texas Instruments TMP512/513 sensor chips

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On Tue, Oct 01, 2019 at 05:50:32PM +0000, Tremblay, Eric wrote:
> hwmon: Add DT bindings for TMP513 driver
> 
> Signed-off-by: Eric Tremblay <etremblay@xxxxxxxxxxxxxxxxxxxx>
> ---
>  .../devicetree/bindings/hwmon/tmp513.txt      | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/tmp513.txt
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/tmp513.txt b/Documentation/devicetree/bindings/hwmon/tmp513.txt
> new file mode 100644
> index 000000000000..0f61793cbf2f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/tmp513.txt
> @@ -0,0 +1,33 @@
> +TMP513 system monitor sensor
> +-------------------------
> +
> +Require node properties:
> +- compatible: one of
> +		"ti,tmp512"
> +		"ti,tmp513"
> +- reg : the I2C address of the device. This is 0x5c, 0x5d, 0x5e, or 0x5f.
> +- shunt-resistor-uohm : The shunt resistor value in uOhm.
> +
> +Optional properties:
> +- bus-voltage-range: 32V or 16V, default to 32V.
> +- max-expected-current-ma: Maximum expected current value. Default to max possible value.
> +- pga-gain: The gain value for the PGA function. This is 8, 4, 2 or 1. Default to 8.
> +- temp_2_nfactor: nFactor for remote channel 1. Value according to Table 11 in datasheet.
> +- temp_3_nfactor: nFactor for remote channel 2. Value according to Table 11 in datasheet.
> +- temp_4_nfactor: nFactor for remote channel 3. Value according to Table 11 in datasheet,
> +				  TMP513 only.
> +- temp_hysteresis: Hystereris for temperature limits.

There is a standard sysfs attribute for hysteresis values, and I assume this
is one parameter that users might want to change at runtime. Why not use it ?

> +
> +Example:
> +	tmp513@5c {
> +		  compatible = "ti,tmp513";
> +		  reg = <0x5C>;
> +		  shunt-resistor-uohm = <330>;
> +		  bus-voltage-range = <32>;
> +		  pga-gain = <8>;
> +		  max-expected-current-ma = <100>;
> +		  temp_2_nfactor = <0x01>;
> +		  temp_3_nfactor = <0x02>;
> +		  temp_4_nfactor = <0x03>;
> +		  temp_hysteresis = <5>;
> +	};
> -- 
> 2.17.1
> 



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