Re: [PATCH v2 1/3] dt-bindings: hwmon: ltc4283: add ltc4284

[Krzysztof Kozlowski]

On Mon, Nov 09, 2026 at 08:56:17AM +0800, Alexis Czezar Torreno wrote:
> The LTC4284 is a negative voltage hot swap controller that drives an
> external N-channel MOSFET to allow a board to be safely inserted and
> removed from a live backplane.
> 
> Note that this device has a MODE pin that is determined by differing
> voltage levels (VEE, VIN, INTVCC, or left open) and cannot be
> controlled via software or GPIO.
> 
> Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@xxxxxxxxxx>
> ---
>  .../devicetree/bindings/hwmon/adi,ltc4283.yaml     | 56 ++++++++++++++++++++--
>  1 file changed, 52 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml
> index 05e2132ad4d8621ab76ee89aa166c131fed08e85..ca62e76f23f1e32df157f138298a4650493b3f08 100644
> --- a/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml
> @@ -10,22 +10,42 @@ maintainers:
>    - Nuno Sá <nuno.sa@xxxxxxxxxx>
>  
>  description: |
> -  The LTC4283 negative voltage hot swap controller drives an external N-channel
> -  MOSFET to allow a board to be safely inserted and removed from a live
> -  backplane.
> +  The LTC4283 and LTC4284 are negative voltage hot swap controllers that drive
> +  external N-channel MOSFETs to allow a board to be safely inserted and removed
> +  from a live backplane.
> +
> +  The LTC4284 features dual-gate drivers with four operating modes (single
> +  driver, parallel, high stress staged start, and low stress staged start)
> +  configured via the hardware MODE pin. The MODE pin must be connected to the
> +  appropriate voltage level (VEE, VIN, INTVCC, or left open) and cannot be
> +  controlled via software or GPIO.
>  
>    https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4283.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4284.pdf
>  
>  properties:
>    compatible:
>      enum:
>        - adi,ltc4283
> +      - adi,ltc4284
>  
>    reg:
>      maxItems: 1
>  
>    adi,rsense-nano-ohms:
> -    description: Value of the sense resistor.
> +    description:
> +      Value of the sense resistor. For LTC4283, this is the resistor connected
> +      between SENSE+/SENSE- pins. For LTC4284, this is the resistor connected
> +      between SENSE1+/SENSE1- pins.
> +
> +  adi,rsense2-nano-ohms:
> +    description:
> +      Value of the SENSE2 current sense resistor. This resistor is connected
> +      between SENSE2+ and SENSE2- pins.
> +
> +  adi,radc-nano-ohms:
> +    description:
> +      Value of the effective resistance seen by the ADC+/ADC- pins.

These two properties are not required by the device? Is there a default
in such case?

Best regards,
Krzysztof