netdev - [PATCH net-next 0/5] net: phy: C45-over-C22 access

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Message-Id: <20230120224011.796097-1-michael@walle.cc>
Date:   Fri, 20 Jan 2023 23:40:06 +0100
From:   Michael Walle <michael@...le.cc>
To:     Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Xu Liang <lxu@...linear.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 0/5] net: phy: C45-over-C22 access

After the c22 and c45 access split is finally merged. This can now be
posted again. The old version can be found here:
https://lore.kernel.org/netdev/20220325213518.2668832-1-michael@walle.cc/
Although all the discussion was here:
https://lore.kernel.org/netdev/20220323183419.2278676-1-michael@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 gpy_probe() will
fail.

Introduce C45-over-C22 support and use it if the MDIO bus doesn't support
C45. Also enable it when a PHY is promoted from C22 to C45.

Changes since RFC v2:
 - Reased to latest net-next
 - new check_rc argument in mmd_phy_indirect() to retain old behavior
 - determine bus capabilities by bus->read and bus->read_c45
 - always set phydev->c45_over_c22 if PHY is promoted

Changes since RFC v1:
 - use __phy_mmd_indirect() in mdiobus_probe_mmd_read()
 - add new properties has_c45 c45_over_c22 (and remove is_c45)
 - drop MDIOBUS_NO_CAP handling, Andrew is preparing a series to
   add probe_capabilities to mark all C45 capable MDIO bus drivers

Michael Walle (5):
  net: phy: add error checks in mmd_phy_indirect() and export it
  net: phy: support indirect c45 access in get_phy_c45_ids()
  net: phy: add support for C45-over-C22 transfers
  phy: net: introduce phy_promote_to_c45()
  net: phy: mxl-gpy: remove unneeded ops

 .../net/ethernet/hisilicon/hns/hns_ethtool.c  |  4 +-
 drivers/net/phy/bcm84881.c                    |  2 +-
 drivers/net/phy/marvell10g.c                  |  2 +-
 drivers/net/phy/mxl-gpy.c                     | 33 +-------
 drivers/net/phy/phy-core.c                    | 48 ++++++++---
 drivers/net/phy/phy.c                         |  6 +-
 drivers/net/phy/phy_device.c                  | 80 ++++++++++++++++---
 drivers/net/phy/phylink.c                     |  8 +-
 include/linux/phy.h                           | 12 ++-
 9 files changed, 128 insertions(+), 67 deletions(-)

-- 
2.30.2