linux-kernel - RE: [PATCH v3 1/4] dt-bindings: net: Add FSD EQoS device tree bindings

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Message-ID: <003001dae194$06218380$12648a80$@samsung.com>
Date: Mon, 29 Jul 2024 14:17:59 +0530
From: "Swathi K S" <swathi.ks@...sung.com>
To: "'Andrew Lunn'" <andrew@...n.ch>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<richardcochran@...il.com>, <alexandre.torgue@...s.st.com>,
	<joabreu@...opsys.com>, <mcoquelin.stm32@...il.com>,
	<alim.akhtar@...sung.com>, <linux-fsd@...la.com>,
	<pankaj.dubey@...sung.com>, <ravi.patel@...sung.com>,
	<netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 1/4] dt-bindings: net: Add FSD EQoS device tree
 bindings



> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: 06 June 2024 18:56
> To: Swathi K S <swathi.ks@...sung.com>
> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> conor+dt@...nel.org; richardcochran@...il.com;
> alexandre.torgue@...s.st.com; joabreu@...opsys.com;
> mcoquelin.stm32@...il.com; alim.akhtar@...sung.com; linux-
> fsd@...la.com; pankaj.dubey@...sung.com; ravi.patel@...sung.com;
> netdev@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-samsung-soc@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH v3 1/4] dt-bindings: net: Add FSD EQoS device tree
bindings
> 
> > > > +  fsd-rx-clock-skew:
> > > > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > > > +    items:
> > > > +      - items:
> > > > +          - description: phandle to the syscon node
> > > > +          - description: offset of the control register
> > > > +    description:
> > > > +      Should be phandle/offset pair. The phandle to the syscon
node.
> > >
> > > What clock are you skew-ing here? And why?
> >
> > As per customer's requirement, we need 2ns delay in fsys block both in
> > TX and RX path.
> 
> Lots of people get RGMII delays wrong. Please look back at the mailing
list
> where there is plenty of discussion about this. I don't want to have to
repeat
> myself yet again...

Sorry for the delay.
We took time to confirm with the board designer regarding this delay.
This is not a mandatory one to have and hence we are dropping clock-skewing
here.

> 
>      Andrew

Thanks,
Swathi