linux-kernel - Re: [PATCH v2] net: mdio: mux-meson-gxl: set 28th bit in eth

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Message-ID: <Z-ssXdmRLYqKbyn6@shell.armlinux.org.uk>
Date: Tue, 1 Apr 2025 00:59:25 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Da Xue <da@...sconfused.com>
Cc: Andrew Lunn <andrew@...n.ch>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Kevin Hilman <khilman@...libre.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Da Xue <da@...re.computer>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	Jerome Brunet <jbrunet@...libre.com>,
	Jakub Kicinski <kuba@...nel.org>, linux-amlogic@...ts.infradead.org,
	Paolo Abeni <pabeni@...hat.com>,
	"David S . Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org,
	Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v2] net: mdio: mux-meson-gxl: set 28th bit in eth_reg2

On Mon, Mar 31, 2025 at 05:21:08PM -0400, Da Xue wrote:
> I found this on the zircon kernel:
> 
> #define REG2_ETH_REG2_REVERSED (1 << 28)
> 
> pregs->Write32(REG2_ETH_REG2_REVERSED | REG2_INTERNAL_PHY_ID, PER_ETH_REG2);
> 
> I can respin and call it that.

Which interface mode is being used, and what is the MAC connected to?

"Reversed" seems to imply that _this_ end is acting as a PHY rather
than the MAC in the link, so I think a bit more information (the above)
is needed to ensure that this is the correct solution.

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