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

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Message-ID: <Z8r45sR7uy0b4UEQ@65YTFL3.secure.tethers.com>
Date: Fri, 7 Mar 2025 08:47:18 -0500
From: Sam Winchenbach <sam.winchenbach@...mepointer.org>
To: Krzysztof Kozlowski <krzk@...nel.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 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. 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.

Thanks,
-Sam

> Best regards,
> Krzysztof
>