linux-kernel - Re: [PATCH net-next 01/12] dt-bindings: ptp: add bindings for NETC Timer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250714103104.vyrkxke7cmknxvqj@skbuf>
Date: Mon, 14 Jul 2025 13:31:04 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Wei Fang <wei.fang@....com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, "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>,
	"robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"richardcochran@...il.com" <richardcochran@...il.com>,
	Claudiu Manoil <claudiu.manoil@....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>
Subject: Re: [PATCH net-next 01/12] dt-bindings: ptp: add bindings for NETC
 Timer

On Mon, Jul 14, 2025 at 01:28:04PM +0300, Wei Fang wrote:
> I do not understand, the property is to indicate which pin the board is
> used to out PPS signal, as I said earlier, these pins are multiplexed with
> other devices, so different board design may use different pins to out
> this PPS signal.

Did you look at the 'pins' API in ptp, as used by other drivers, to set
a function per pin?

> The PPS interface (echo x > /sys/class/ptp/ptp0/pps_enable) provided
> by the current PTP framework only supports enabling or disabling the
> PPS signal. This is obviously limited for PTP devices with multiple channels.

For what we call "PPS" I think you should be looking at the periodic
output (perout) function. "PPS" is to emit events towards the local
system.