linux-kernel - RE: [PATCH v2 net-next 01/14] dt-bindings: ptp: add NETC Timer PTP clock

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Message-ID:
 <PAXPR04MB8510F642E509E915B85062318851A@PAXPR04MB8510.eurprd04.prod.outlook.com>
Date: Thu, 17 Jul 2025 08:30:14 +0000
From: Wei Fang <wei.fang@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
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	<claudiu.manoil@....com>, Vladimir Oltean <vladimir.oltean@....com>, Clark
 Wang <xiaoning.wang@....com>, "andrew+netdev@...n.ch"
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Subject: RE: [PATCH v2 net-next 01/14] dt-bindings: ptp: add NETC Timer PTP
 clock

> On Wed, Jul 16, 2025 at 03:30:58PM +0800, Wei Fang wrote:
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - pci1131,ee02
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +    description:
> > +      The reference clock of NETC Timer, if not present, indicates that
> > +      the system clock of NETC IP is selected as the reference clock.
> 
> If not present...
> 
> > +
> > +  clock-names:
> 
> ... this also is not present...
> 
> > +    description:
> > +      NETC Timer has three reference clock sources, set
> TMR_CTRL[CK_SEL]
> > +      by parsing clock name to select one of them as the reference clock.
> > +      The "system" means that the system clock of NETC IP is used as the
> > +      reference clock.
> > +      The "ccm_timer" means another clock from CCM as the reference
> clock.
> > +      The "ext_1588" means the reference clock comes from external IO
> pins.
> > +    enum:
> > +      - system
> 
> So what does system mean?
> 

"system" is the system clock of the NETC subsystem, we can explicitly specify
this clock as the PTP reference clock of the Timer in the DT node. Or do not
add clock properties to the DT node, it implicitly indicates that the reference
clock of the Timer is the "system" clock.