linux-kernel - [RFC net-next 1/2] net: phy: allow mdio bus to probe for c45 devices before c22

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Message-Id: <20210525055839.22496-1-vee.khee.wong@linux.intel.com>
Date:   Tue, 25 May 2021 13:58:39 +0800
From:   Wong Vee Khee <vee.khee.wong@...ux.intel.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC net-next 1/2] net: phy: allow mdio bus to probe for c45 devices before c22

Some MAC controllers that is able to pair with  external PHY devices
such as the Synopsys MAC Controller (STMMAC) support both Clause-22 and
Clause-45 access.

When paired with PHY devices that only accessible via Clause-45, such as
the Marvell 88E2110, any attempts to access the PHY devices via
Clause-22 will get a PHY ID of all zeroes.

To fix this, we introduce MDIOBUS_C45_C22 which the MAC controller will
try with Clause-45 access before going to Clause-22.

Signed-off-by: Wong Vee Khee <vee.khee.wong@...ux.intel.com>
---
 include/linux/phy.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 60d2b26026a2..9b0e2c76e19b 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -368,6 +368,7 @@ struct mii_bus {
 		MDIOBUS_C22,
 		MDIOBUS_C45,
 		MDIOBUS_C22_C45,
+		MDIOBUS_C45_C22,
 	} probe_capabilities;

 	/** @shared_lock: protect access to the shared element */
-- 
2.25.1