netdev - Re: [PATCH v3 net-next 1/6] net: phy: realtek: configure SerDes mode for rtl822xb PHYs

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Message-ID: <ZgxbL03HMl41LHqb@shell.armlinux.org.uk>
Date: Tue, 2 Apr 2024 20:23:27 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Eric Woudstra <ericwouds@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Marek Behún <kabel@...nel.org>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
	Alexander Couzens <lynxis@...0.eu>
Subject: Re: [PATCH v3 net-next 1/6] net: phy: realtek: configure SerDes mode
 for rtl822xb PHYs

On Tue, Apr 02, 2024 at 07:58:43AM +0200, Eric Woudstra wrote:
> From: Alexander Couzens <lynxis@...0.eu>
> 
> The rtl8221b and rtl8226b series support switching SerDes mode between
> 2500base-x and sgmii based on the negotiated copper speed.
> 
> Configure this switching mode according to SerDes modes supported by
> host.
> 
> There is an additional datasheet for RTL8226B/RTL8221B called
> "SERDES MODE SETTING FLOW APPLICATION NOTE" where a sequence is
> described to setup interface and rate adapter mode.
> 
> However, there is no documentation about the meaning of registers
> and bits, it's literally just magic numbers and pseudo-code.
> 
> Signed-off-by: Alexander Couzens <lynxis@...0.eu>
> [ refactored, dropped HiSGMII mode and changed commit message ]
> Signed-off-by: Marek Behún <kabel@...nel.org>
> [ changed rtl822x_update_interface() to use vendor register ]
> [ always fill in possible interfaces ]
> [ only apply to rtl8221b and rtl8226b phy's ]
> [ set phydev->rate_matching in .config_init() ]
> Signed-off-by: Eric Woudstra <ericwouds@...il.com>

Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Thanks!

-- 
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