linux-kernel - [RFC net-next 0/2] Introduce MDIO probe order C45 over C22

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Message-Id: <20210525055803.22116-1-vee.khee.wong@linux.intel.com>
Date:   Tue, 25 May 2021 13:58:03 +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 0/2] Introduce MDIO probe order C45 over C22

Synopsys MAC controller is capable of pairing with external PHY devices
that accessible via Clause-22 and Clause-45.

There is a problem when it is paired with Marvell 88E2110 which returns
PHY ID of 0 using get_phy_c22_id(). We can add this check in that
function, but this will break swphy, as swphy_reg_reg() return 0. [1]

Hence, we introduce MDIOBUS_CAP_C45_C22 which allow us to probe using
Clause-45, if it fails, we then proceed to try with Clause-22.

[1]: https://lkml.org/lkml/2021/3/18/584

Wong Vee Khee (2):
  net: phy: allow mdio bus to probe for c45 devices before c22
  net: stmmac: allow gmac4 to probe for c45 devices before c22

 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 2 +-
 include/linux/phy.h                               | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

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2.25.1