linux-kernel - Re: [RESEND PATCH 1/2] dt-bindings: phy: mediatek,xsphy: add property to set disconnect threshold

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Message-ID: <20250211-destiny-crablike-ab17a2814b7a@spud>
Date: Tue, 11 Feb 2025 18:30:28 +0000
From: Conor Dooley <conor@...nel.org>
To: Chunfeng Yun (云春峰) <Chunfeng.Yun@...iatek.com>
Cc: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"vkoul@...nel.org" <vkoul@...nel.org>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [RESEND PATCH 1/2] dt-bindings: phy: mediatek,xsphy: add
 property to set disconnect threshold

On Sun, Feb 09, 2025 at 03:34:12AM +0000, Chunfeng Yun (云春峰) wrote:
> On Mon, 2025-01-13 at 18:30 +0000, Conor Dooley wrote:
> > On Sat, Jan 11, 2025 at 10:15:41PM +0800, Chunfeng Yun wrote:
> > > Add a property to tune usb2 phy's disconnect threshold.
> > > And add a compatible for mt8196.
> > > 
> > > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > > ---
> > > based on kernel 6.13-rc1
> > > 
> > > this property is porting from t-phy driver, due to the u2 phy are
> > > similar.
> > > ---
> > >  Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml | 8
> > > ++++++++
> > >  1 file changed, 8 insertions(+)
> > > 
> > > diff --git
> > > a/Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml
> > > b/Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml
> > > index a9e3139fd421..2e012d5e1da1 100644
> > > --- a/Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml
> > > +++ b/Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml
> > > @@ -49,6 +49,7 @@ properties:
> > >        - enum:
> > >            - mediatek,mt3611-xsphy
> > >            - mediatek,mt3612-xsphy
> > > +          - mediatek,mt8196-xsphy
> > >        - const: mediatek,xsphy
> > >  
> > >    reg:
> > > @@ -129,6 +130,13 @@ patternProperties:
> > >          minimum: 1
> > >          maximum: 7
> > >  
> > > +      mediatek,discth:

Just make it "disconnect-threshold" please.

> > > +        description:
> > > +          The selection of disconnect threshold (U2 phy)
> > > +        $ref: /schemas/types.yaml#/definitions/uint32
> > > +        minimum: 1
> > > +        maximum: 15
> > 
> > What unit is this? Unitless? How are the values determined?
> No unit, it's a level, may be treat it as an index to select different
> threshold.

So this is a register value of some sort? What is the actual threshold
measured in?

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