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net: dsa: microchip: add PTP interrupt handling for KSZ8463

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KSZ8463 PTP interrupts aren't handled by the driver.
The interrupt layout in KSZ8463 has nothing to do with the other
switches:
- Its global interrupt enable register is 16-bits long and follow an
  'enable' logic, instead of a 'mask' one
- all the interrupts of all ports are grouped into one status register
  while others have one interrupt register per port
- xdelay_req and pdresp timestamps share one single interrupt bit on the
  KSZ8463 while each of them has its own interrupt bit on other switches

Create a KSZ8463-specific set of interrupt domain operations to handle
the global IRQ layer. To limit code duplication, it uses the same
interrupt handler than the other switches. Since other switches have
8-bits registers, only the high-byte of the interrupt status/enable
registers are used. This high-byte is where the PTP interrupts are
located. The low-byte contains the wake-up detection interrupts so if at
some points these interrupts are needed we'll need a bit of rework here.

Create KSZ8463-specific functions to setup the PTP interrupts. The
created IRQ domain is tied to the first port of the KSZ8463. Again,
the same PTP interrupt handler than the others switches is used.

Implement the teardown callback to release the interrupts.

Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20260727-ksz-new-ptp-v3-4-caba39e680e3@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Bastien Curutchet (Schneider Electric) 2026-07-27 12:20:46 +02:00 • committed by Jakub Kicinski
commit b3422f60e9
4 changed files with 237 additions and 2 deletions
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