linux-kernel - RE: [PATCH v2 net-next 02/14] dt-bindings: net: add nxp,netc-timer property

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Message-ID:
 <PAXPR04MB851091A05F842B7E3CC33D3E8851A@PAXPR04MB8510.eurprd04.prod.outlook.com>
Date: Thu, 17 Jul 2025 03:23:22 +0000
From: Wei Fang <wei.fang@....com>
To: Frank Li <frank.li@....com>, "robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>
CC: "richardcochran@...il.com" <richardcochran@...il.com>, Claudiu Manoil
	<claudiu.manoil@....com>, Vladimir Oltean <vladimir.oltean@....com>, Clark
 Wang <xiaoning.wang@....com>, "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>, "s.hauer@...gutronix.de"
	<s.hauer@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>, "F.S.
 Peng" <fushi.peng@....com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE: [PATCH v2 net-next 02/14] dt-bindings: net: add nxp,netc-timer
 property

> On Wed, Jul 16, 2025 at 03:30:59PM +0800, Wei Fang wrote:
> > NETC is a multi-function PCIe Root Complex Integrated Endpoint (RCiEP)
> > that contains multiple PCIe functions, such as ENETC and Timer. Timer
> > provides PTP time synchronization functionality and ENETC provides the
> > NIC functionality.
> >
> > For some platforms, such as i.MX95, it has only one timer instance, so
> > the binding relationship between Timer and ENETC is fixed. But for
> > some platforms, such as i.MX943, it has 3 Timer instances, by setting
> > the EaTBCR registers of the IERB module, we can specify any Timer
> > instance to be bound to the ENETC instance.
> >
> > Therefore, add "nxp,netc-timer" property to bind ENETC instance to a
> > specified Timer instance so that ENETC can support PTP synchronization
> > through Timer.
> >
> > Signed-off-by: Wei Fang <wei.fang@....com>
> >
> > ---
> > v2 changes:
> > new patch
> > ---
> >  .../devicetree/bindings/net/fsl,enetc.yaml    | 23 +++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/net/fsl,enetc.yaml
> > b/Documentation/devicetree/bindings/net/fsl,enetc.yaml
> > index ca70f0050171..ae05f2982653 100644
> > --- a/Documentation/devicetree/bindings/net/fsl,enetc.yaml
> > +++ b/Documentation/devicetree/bindings/net/fsl,enetc.yaml
> > @@ -44,6 +44,13 @@ properties:
> >      unevaluatedProperties: false
> >      description: Optional child node for ENETC instance, otherwise use
> NETC EMDIO.
> >
> > +  nxp,netc-timer:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      Specifies a reference to a node representing a NETC Timer device,
> > +      which provides time synchronization as required for IEEE 1588 and
> > +      IEEE 802.1AS-2020.
> > +
> 
> I think it is quite common. add ptp-timer ethernet-controller.yaml?
> 

Good suggestion, but I'd like to ask for the opinions of others.
Rob, Krzysztof, Conor, what do you think?