netdev - [PATCH net-next v2 11/14] net: stmmac: do not require snps,ps-speed for SGMII

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Message-Id: <E1v9P6n-0000000Aom9-2LuZ@rmk-PC.armlinux.org.uk>
Date: Thu, 16 Oct 2025 15:37:37 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Abhishek Chauhan <quic_abchauha@...cinc.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Alexis Lothore <alexis.lothore@...tlin.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Boon Khai Ng <boon.khai.ng@...era.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	"David S. Miller" <davem@...emloft.net>,
	Drew Fustini <dfustini@...storrent.com>,
	Emil Renner Berthing <emil.renner.berthing@...onical.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>,
	Furong Xu <0x1207@...il.com>,
	Inochi Amaoto <inochiama@...il.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"Jan Petrous (OSS)" <jan.petrous@....nxp.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
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	Matthew Gerlach <matthew.gerlach@...era.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	netdev@...r.kernel.org,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Paolo Abeni <pabeni@...hat.com>,
	Rohan G Thomas <rohan.g.thomas@...era.com>,
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	Vladimir Oltean <olteanv@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Yu-Chun Lin <eleanor15x@...il.com>
Subject: [PATCH net-next v2 11/14] net: stmmac: do not require snps,ps-speed
 for SGMII

SGMII mode does not require port-speed to be specified; this only
switches SGMII to use the MAC configuration register speed settings
and the actual value is irrelevant when the link comes up.

As it seems the intention was to support "reverse SGMII" with this
setting, but the code didn't actually configure that due to a typo,
the warning and bad DT binding documentation has led people to
specify snps,ps-speed in their DT files inappropriately.

If mac_port_sel_speed is zero, then don't complain that the speed
is invalid, as this means we're using "normal" SGMII.

This does _not_ obsolete snps,ps-speed, nor does it change the
behaviour of that property, with the exception of not making people
mistakenly believe that they need to specify this option to use
normal SGMII. There is no need to modify the binding.

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
v2: add comment about why there's no requirement to change the DT
binding.
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8f08366c25a4..79d09b40dbcc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1101,6 +1101,8 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 
 		default:
 			dev_warn(priv->device, "invalid port speed\n");
+			fallthrough;
+		case 0:
 			priv->hw->reverse_sgmii_enable = false;
 			break;
 		}
-- 
2.47.3