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    Subject[PATCH net-next v3 0/8] net: phy: mscc: PHC and timestamping support
    Date
    Hello,

    This series aims at adding support for PHC and timestamping operations
    in the MSCC PHY driver, for the VSC858x and VSC8575. Those PHYs are
    capable of timestamping in 1-step and 2-step for both L2 and L4 traffic.

    As of this series, only IPv4 support was implemented when using L4 mode.
    This is because of an hardware limitation which prevents us for
    supporting both IPv4 and IPv6 at the same time. Implementing support for
    IPv6 should be quite easy (I do have the modifications needed for the
    hardware configuration) but I did not see a way to retrieve this
    information in hwtstamp(). What would you suggest?

    Those PHYs are distributed in hardware packages containing multiple
    times the PHY. The VSC8584 for example is composed of 4 PHYs. With
    hardware packages, parts of the logic is usually common and one of the
    PHY has to be used for some parts of the initialization. Following this
    logic, the 1588 blocks of those PHYs are shared between two PHYs and
    accessing the registers has to be done using the "base" PHY of the
    group. This is handled thanks to helpers in the PTP code (and locks).
    We also need the MDIO bus lock while performing a single read or write
    to the 1588 registers as the read/write are composed of multiple MDIO
    transactions (and we don't want other threads updating the page).

    To get and set the PHC time, a GPIO has to be used and changes are only
    retrieved or committed when on a rising edge. The same GPIO is shared by
    all PHYs, so the granularity of the lock protecting it has to be
    different from the ones protecting the 1588 registers (the VSC8584 PHY
    has 2 1588 blocks, and a single load/save pin).

    Patch 1 extends the recently added helpers to share information between
    PHYs of the same hardware package; to allow having part of the probe to
    be shared (in addition to the already supported init part). This will be
    used when adding support for PHC/TS to initialize locks.

    Patches 2 and 3 are mostly cosmetic.

    Patch 4 takes into account the 1588 block in the MACsec initialization,
    to allow having both the MACsec and 1588 blocks initialized on a running
    system.

    Patches 5 and 6 add support for PHC and timestamping operations in the
    MSCC driver. An initialization of the 1588 block (plus all the registers
    definition; and helpers) is added first; and then comes a patch to
    implement the PHC and timestamping API.

    Patches 7 and 8 add the required hardware description for device trees,
    to be able to use the load/save GPIO pin on the PCB120 board.

    To use this on a PCB120 board, two other series are needed and have
    already been sent upstream (one is merged). There are no dependency
    between all those series.

    Thanks!
    Antoine

    Since v2:
    - Removed explicit inlines from .c files.
    - Fixed three warnings.

    Since v1:
    - Removed checks in rxtstamp/txtstamp as skb cannot be NULL here.
    - Reworked get_ptp_header_rx/get_ptp_header.
    - Reworked the locking logic between the PHC and timestamping
    operations.
    - Fixed a compilation issue on x86 reported by Jakub.

    Antoine Tenart (5):
    net: phy: add support for a common probe between shared PHYs
    net: phy: mscc: fix copyright and author information in MACsec
    net: phy: mscc: take into account the 1588 block in MACsec init
    net: phy: mscc: timestamping and PHC support
    dt-bindings: net: phy: vsc8531: document the load/save GPIO

    Quentin Schulz (3):
    net: phy: mscc: remove the TR CLK disable magic value
    net: phy: mscc: 1588 block initialization
    MIPS: dts: ocelot: describe the load/save GPIO

    .../bindings/net/mscc-phy-vsc8531.txt | 3 +
    arch/mips/boot/dts/mscc/ocelot_pcb120.dts | 12 +-
    drivers/net/phy/mscc/Makefile | 4 +
    drivers/net/phy/mscc/mscc.h | 64 +
    drivers/net/phy/mscc/mscc_fc_buffer.h | 2 +-
    drivers/net/phy/mscc/mscc_mac.h | 2 +-
    drivers/net/phy/mscc/mscc_macsec.c | 10 +-
    drivers/net/phy/mscc/mscc_macsec.h | 2 +-
    drivers/net/phy/mscc/mscc_main.c | 63 +-
    drivers/net/phy/mscc/mscc_ptp.c | 1587 +++++++++++++++++
    drivers/net/phy/mscc/mscc_ptp.h | 477 +++++
    include/linux/phy.h | 18 +-
    12 files changed, 2223 insertions(+), 21 deletions(-)
    create mode 100644 drivers/net/phy/mscc/mscc_ptp.c
    create mode 100644 drivers/net/phy/mscc/mscc_ptp.h

    --
    2.26.2

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