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

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Date: Tue, 25 Jul 2023 22:04:37 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
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>,
	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:
> +static bool imx_dwmac_is_fixed_link(struct imx_priv_data *dwmac)
> +{
> +	struct plat_stmmacenet_data *plat_dat;
> +	struct device_node *dn;
> +
> +	if (!dwmac || !dwmac->plat_dat)
> +		return false;
> +
> +	plat_dat = dwmac->plat_dat;
> +	dn = of_get_child_by_name(dwmac->dev->of_node, "fixed-link");
> +	if (!dn)
> +		return false;
> +
> +	if (plat_dat->phy_node == dn || plat_dat->phylink_node == dn)
> +		return true;

Why would the phy_node or the phylink_node ever be pointing at the
fixed-link node?

For one, phylink expects the fwnode being passed to it to be pointing
at the _parent_ node of the fixed-link node, since it looks up from
the parent for "fixed-link" node.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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