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

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Message-ID: <20250717-furry-hummingbird-of-growth-4f5f1d@kuoka>
Date: Thu, 17 Jul 2025 09:40:18 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Wei Fang <wei.fang@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	richardcochran@...il.com, claudiu.manoil@....com, vladimir.oltean@....com, 
	xiaoning.wang@....com, andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, vadim.fedorenko@...ux.dev, Frank.Li@....com, 
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com, fushi.peng@....com, 
	devicetree@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	imx@...ts.linux.dev, kernel@...gutronix.de
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?

Best regards,
Krzysztof