linux-kernel - Re: [PATCH net-next 06/11] net: dsa: rzn1-a5psw: Add support for optional timestamp clock

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Message-ID: <20251121193942.gsogugfoa6nafwzf@skbuf>
Date: Fri, 21 Nov 2025 21:39:42 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Clément Léger <clement.leger@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Simon Horman <horms@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Russell King <linux@...linux.org.uk>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next 06/11] net: dsa: rzn1-a5psw: Add support for
 optional timestamp clock

On Fri, Nov 21, 2025 at 11:35:32AM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Add support for an optional "ts" (timestamp) clock to the RZN1 A5PSW
> driver. Some SoC variants provide a dedicated clock source for
> timestamping or time synchronization features within the Ethernet
> switch IP.
> 
> Request and enable this clock during probe if defined in the device tree.
> If the clock is not present, the driver continues to operate normally.
> 
> This change prepares the driver for Renesas RZ/T2H and RZ/N2H SoCs, where
> the Ethernet switch includes a timestamp clock input.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---

What is the impact to the current driver if you get the clock and
disable it? I'm trying to understand if it's possible to only enable it
when using a feature that requires it.