netdev - Re: [PATCH] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link

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Message-ID: <93ffd7a5-2479-4726-b26a-aab10ac09d14@lunn.ch>
Date: Wed, 26 Jul 2023 10:32:00 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Shenwei Wang <shenwei.wang@....com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Shawn Guo <shawnguo@...nel.org>, NXP Linux Team <linux-imx@....com>,
	Russell King <linux@...linux.org.uk>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
	Frank Li <frank.li@....com>
Subject: Re: [PATCH] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link

On Tue, Jul 25, 2023 at 02:49:31PM -0500, Shenwei Wang wrote:
> When using a fixed-link setup, certain devices like the SJA1105 require a
> small pause in the TXC clock line to enable their internal tunable
> delay line (TDL).

The SJA1105 has the problem, so i would expect it to be involved in
the solution. Otherwise, how is this going to work for other MAC
drivers?

Maybe you need to expose a common clock framework clock for the TXC
clock line, which the SJA1105 can disable/enable? That then makes it
clear what other MAC drivers need to do.

      Andrew