Re: [PATCH v2 1/2] dt-bindings: net: dp83826: support TX data voltage tuning

[POPESCU Catalin]

On 08.02.24 09:50, Krzysztof Kozlowski wrote:
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> On 08/02/2024 09:48, POPESCU Catalin wrote:
>> On 08.02.24 08:35, Krzysztof Kozlowski wrote:
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>>> On 07/02/2024 18:58, Catalin Popescu wrote:
>>>> Add properties ti,cfg-dac-minus-one-milli-percent and
>>>> ti,cfg-dac-plus-one-milli-percent to support voltage tuning
>>>> of logical levels -1/+1 of the MLT-3 encoded TX data.
>>>>
>>>> Signed-off-by: Catalin Popescu <catalin.popescu@xxxxxxxxxxxxxxxxxxxx>
>>>> ---
>>>> Changes in v2:
>>>>    - squash the 2 DT bindings patches in one single patch
>>>>    - drop redundant "binding" from the DT bindings patch title
>>>>    - rename DT properties and define them as percentage
>>>>    - add default value for each new DT property
>>>> ---
>>>>    .../devicetree/bindings/net/ti,dp83822.yaml    | 18 ++++++++++++++++++
>>>>    1 file changed, 18 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/net/ti,dp83822.yaml b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
>>>> index db74474207ed..6bbd465e51d6 100644
>>>> --- a/Documentation/devicetree/bindings/net/ti,dp83822.yaml
>>>> +++ b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
>>>> @@ -62,6 +62,24 @@ properties:
>>>>           for the PHY.  The internal delay for the PHY is fixed to 3.5ns relative
>>>>           to transmit data.
>>>>
>>>> +  ti,cfg-dac-minus-one-milli-percent:
>>>> +    description: |
>>>> +       DP83826 PHY only.
>>>> +       Sets the voltage ratio (with respect to the nominal value)
>>>> +       of the logical level -1 for the MLT-3 encoded TX data.
>>>> +    enum: [50000, 56250, 62500, 68750, 75000, 81250, 87500, 93750, 100000,
>>>> +           106250, 112500, 118750, 125000, 131250, 137500, 143750, 150000]
>>> I see all values being multiple of basis points, so why not using -bp
>>> suffix?
>> I can read :
>>
>>     "-bp$":
>>       $ref: types.yaml#/definitions/int32-array
>>       description: basis points (1/100 of a percent)
>>
>> In my case it's 1/1000 of a percent. As I'm not sure exactly what the
>> author meant by "basis points", would this apply to my patch as well?
> So please show me the value which does not fit in -bp.

"Basis points" doesn't mean anything to me, that's why I was asking for 
confirmation :)
I don't have any issue to use "-bp" at all, I'm not pusing against.

>
> Best regards,
> Krzysztof
>