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Date: Wed, 23 Mar 2022 19:34:14 +0100 From: Michael Walle <michael@...le.cc> To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com> Cc: "David S . Miller" <davem@...emloft.net>, Xu Liang <lxu@...linear.com>, Alexandre Belloni <alexandre.belloni@...tlin.com>, Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Michael Walle <michael@...le.cc> Subject: [PATCH RFC net-next 0/5] net: phy: C45-over-C22 access Hi, This is the result of this discussion: https://lore.kernel.org/netdev/240354b0a54b37e8b5764773711b8aa3@walle.cc/ The goal here is to get the GYP215 and LAN8814 running on the Microchip LAN9668 SoC. The LAN9668 suppports one external bus and unfortunately, the LAN8814 has a bug which makes it impossible to use C45 on that bus. Fortunately, it was the intention of the GPY215 driver to be used on a C22 bus. But I think this could have never really worked, because the phy_get_c45_ids() will always do c45 accesses and thus on MDIO bus drivers which will correctly check for the MII_ADDR_C45 flag and return -EOPNOTSUPP the function call will fail and thus gpy_probe() will fail. This series tries to fix that and will lay the foundation to add a workaround for the LAN8814 bug by forcing an MDIO bus to be c22-only. At the moment, the probe_capabilities is taken into account to decide if we have to use C45-over-C22. What is still missing from this series is the handling of a device tree property to restrict the probe_capabilities to c22-only. Since net-next is closed, this is marked as RFC to get some early feedback. Michael Walle (5): net: phy: mscc-miim: reject clause 45 register accesses net: phy: support indirect c45 access in get_phy_c45_ids() net: phy: mscc-miim: add probe_capabilities net: phy: introduce is_c45_over_c22 flag net: phylink: handle the new is_c45_over_c22 property drivers/net/mdio/mdio-mscc-miim.c | 7 ++++ drivers/net/phy/mxl-gpy.c | 2 +- drivers/net/phy/phy_device.c | 65 ++++++++++++++++++++++++++----- drivers/net/phy/phylink.c | 2 +- include/linux/phy.h | 4 +- 5 files changed, 68 insertions(+), 12 deletions(-) -- 2.30.2
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