netdev - Re: [RFC PATCH] net: add net-device TX clock source selection framework

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Message-ID: <tmp2xu6wrgjk43oxzvzpt7gqb6tdgncwhhapjg7jkmhpb525zd@uxabkfcpbghg>
Date: Thu, 31 Jul 2025 13:02:22 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
Cc: "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, 
	"Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.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>, 
	"horms@...nel.org" <horms@...nel.org>, "sdf@...ichev.me" <sdf@...ichev.me>, 
	"almasrymina@...gle.com" <almasrymina@...gle.com>, "asml.silence@...il.com" <asml.silence@...il.com>, 
	"leitao@...ian.org" <leitao@...ian.org>, "kuniyu@...gle.com" <kuniyu@...gle.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH] net: add net-device TX clock source selection
 framework

Wed, Jul 30, 2025 at 04:09:03PM +0200, arkadiusz.kubalewski@...el.com wrote:
>>From: Jiri Pirko <jiri@...nulli.us>
>>Sent: Wednesday, July 30, 2025 2:26 PM
>>
>>Tue, Jul 29, 2025 at 12:45:28PM +0200, arkadiusz.kubalewski@...el.com
>>wrote:
>>
>>[...]
>>
>>>User interface:
>>>- Read /sys/class/net/<device>/tx_clk/<clock_name> to get status (0/1)
>>>- Write "1" to switch to that clock source
>>
>>I wonder, if someone invented a time machine and sent me back to 2005...
>>
>
>Probably temporarily, but this was quickest to invent :S
>
>Creating a single DPLL device for each PF/port seems overshot,
>Could go with extending netdev-genl

That would be my first choice.

>Any other ideas?
>
>Thank you!
>Arkadiusz
>
>>[...]