[PATCH 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis

[Chunfeng Yun]

On Fri, 2022-08-19 at 15:15 +0300, Krzysztof Kozlowski wrote:
> On 19/08/2022 12:13, Chunfeng Yun wrote:
> > Add a property to set usb2 phy's pre-emphasis.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
> > ---
> >  Documentation/devicetree/bindings/phy/mediatek,tphy.yaml | 7
> > +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
> > b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
> > index 848edfb1f677..aee2f3027371 100644
> > --- a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
> > @@ -219,6 +219,13 @@ patternProperties:
> >          minimum: 1
> >          maximum: 15
> >  
> > +      mediatek,pre-emphasis:
> > +        description:
> > +          The selection of pre-emphasis (U2 phy)
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        minimum: 1
> > +        maximum: 3
> 
> Instead of hard-coding register values in bindings, you should rather
> describe here feature/effect. If it is in units, use unit suffixes.
> If
> it is some choice, usually string enum is appropriate.
How about changing description as bellow:

"The level of pre-emphasis, increases one level, boosts the relative
amplitudes of signal's higher frequencies components about 4.16% (U2
phy)"

Thanks

> 
> Best regards,
> Krzysztof