[net-next RFC PATCH v4 0/6] net: phy: Add support for new Aeonsemi PHYs

[Christian Marangi]

Add support for new Aeonsemi 10G C45 PHYs. These PHYs intergate an IPC
to setup some configuration and require special handling to sync with
the parity bit. The parity bit is a way the IPC use to follow correct
order of command sent.

Supported PHYs AS21011JB1, AS21011PB1, AS21010JB1, AS21010PB1,
AS21511JB1, AS21511PB1, AS21510JB1, AS21510PB1, AS21210JB1,
AS21210PB1 that all register with the PHY ID 0x7500 0x7500
before the firmware is loaded.

The big special thing about this PHY is that it does provide
a generic PHY ID in C45 register that change to the correct one
one the firmware is loaded.

In practice:
- MMD 0x7 ID 0x7500 0x9410 -> FW LOAD -> ID 0x7500 0x9422

To handle this, we operate on .match_phy_device where
we check the PHY ID, if the ID match the generic one,
we load the firmware and we return 0 (PHY driver doesn't
match). Then PHY core will try the next PHY driver in the list
and this time the PHY is correctly filled in and we register
for it.

To help in the matching and not modify part of the PHY device
struct, .match_phy_device is extended to provide also the
current phy_driver is trying to match for. This add the
extra benefits that some other PHY can simplify their
.match_phy_device OP.

Changes v4:
- Add Reviewed-by tag
- Better handle PHY ID scan in as21xxx
- Also simplify nxp driver and fix .match_phy_device
Changes v3:
- Correct typo intergate->integrate
- Try to reduce to 80 column (where possible... define become
  unreasable if split)
- Rework to new .match_phy_device implementation
- Init active_low_led and fix other minor smatch war
- Drop inline tag (kbot doesn't like it but not reported by checkpatch???)
Changes v2:
- Move to RFC as net-next closed :(
- Add lock for IPC command
- Better check size values from IPC
- Add PHY ID for all supported PHYs
- Drop .get_feature (correct values are exported by standard
  regs)
- Rework LED event to enum
- Update .yaml with changes requested (firmware-name required
  for generic PHY ID)
- Better document C22 in C45
- Document PHY name logic
- Introduce patch to load PHY 2 times

Christian Marangi (6):
  net: phy: pass PHY driver to .match_phy_device OP
  net: phy: bcm87xx: simplify .match_phy_device OP
  net: phy: nxp-c45-tja11xx: simplify .match_phy_device OP
  net: phy: introduce genphy_match_phy_device()
  net: phy: Add support for Aeonsemi AS21xxx PHYs
  dt-bindings: net: Document support for Aeonsemi PHYs

 .../bindings/net/aeonsemi,as21xxx.yaml        |  122 ++
 MAINTAINERS                                   |    7 +
 drivers/net/phy/Kconfig                       |   12 +
 drivers/net/phy/Makefile                      |    1 +
 drivers/net/phy/as21xxx.c                     | 1067 +++++++++++++++++
 drivers/net/phy/bcm87xx.c                     |   14 +-
 drivers/net/phy/icplus.c                      |    6 +-
 drivers/net/phy/marvell10g.c                  |   12 +-
 drivers/net/phy/micrel.c                      |    6 +-
 drivers/net/phy/nxp-c45-tja11xx.c             |   35 +-
 drivers/net/phy/nxp-tja11xx.c                 |    6 +-
 drivers/net/phy/phy_device.c                  |   52 +-
 drivers/net/phy/realtek/realtek_main.c        |   27 +-
 drivers/net/phy/teranetics.c                  |    3 +-
 include/linux/phy.h                           |    6 +-
 15 files changed, 1310 insertions(+), 66 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/aeonsemi,as21xxx.yaml
 create mode 100644 drivers/net/phy/as21xxx.c

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2.48.1