linux-kernel - Re: [PATCH v5 1/6] dt-bindings: iio: filter: Add lpf/hpf freq margins

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Message-ID: <49d6bdfd-a2d3-48e6-aabc-e6674256e5a8@kernel.org>
Date: Sun, 9 Mar 2025 20:55:39 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sam Winchenbach <sam.winchenbach@...mepointer.org>
Cc: linux-kernel@...r.kernel.org, lars@...afoo.de,
 Michael.Hennerich@...log.com, antoniu.miclaus@...log.com, jic23@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org, bpellegrino@...a.org
Subject: Re: [PATCH v5 1/6] dt-bindings: iio: filter: Add lpf/hpf freq margins

On 07/03/2025 14:47, Sam Winchenbach wrote:
> On Fri, Mar 07, 2025 at 09:34:24AM +0100, Krzysztof Kozlowski wrote:
>> On Thu, Mar 06, 2025 at 01:33:09PM -0500, Sam Winchenbach wrote:
>>> Adds two properties to add a margin when automatically finding the
>>> corner frequencies.
>>>
>>> Signed-off-by: Sam Winchenbach <sam.winchenbach@...mepointer.org>
>>> ---
>>>  .../bindings/iio/filter/adi,admv8818.yaml     | 23 +++++++++++++++++++
>>>  1 file changed, 23 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
>>> index b77e855bd594..3f9c61547a78 100644
>>> --- a/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
>>> +++ b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
>>> @@ -44,6 +44,27 @@ properties:
>>>    '#clock-cells':
>>>      const: 0
>>>  
>>> +
>>
>> Unnecessary blank line
>>
> 
> Noted for v6.
> 
>>> +  adi,lpf-margin-hz:
>>> +    description:
>>> +      Sets the minimum distance (in Hz) between the fundamental
>>> +      frequency of `rf_in` and the corner frequency of the low-pass, output
>>> +      filter when operatred in 'auto' mode. The selected low-pass corner
>>> +      frequency will be greater than, or equal to, `rf_in` + `lpf-margin-hz`. If
>>> +      not setting is found that satisfies this relationship the filter will be
>>> +      put into 'bypass'.
>>> +    default: 0
>>
>> hz are 32-bit, not 64-bit, so I think you need:
>>
>>   default: [0, 0]
>>   minItems: 2
>>   maxItems: 2
>>
> 
> I think I finally understand - "-hz" is a schema type defined as a uint32. 

No, it is uint32-array.

> Is that correct? I am really surprised that `dt_binding_check` did not complain about it being 64-bits.  I will update these to `-mhz` and make them uint32 in v6.

so your code worked fine, because it assumed you will pass two 32-bit
integers, so two items. That's why I proposed to define the number of
items, even though it looks odd, but that's result of 32-bit value.

Maybe we need "-hz-64" or "-64-hz" property suffix?

Best regards,
Krzysztof