| Message ID | 20240203-unify-c22-c45-scan-error-handling-v1-0-8aa9fa3c4fca@lunn.ch (mailing list archive) |
|---|---|
| Headers | show |
| Series | Unify C22 and C45 error handling during bus enumeration | expand |
On Sat, Feb 03, 2024 at 02:52:47PM -0600, Andrew Lunn wrote: > When enumerating an MDIO bus, an MDIO bus driver can return -ENODEV to > a C22 read transaction to indicate there is no device at that address > on the bus. Enumeration will then continue with the next address on > the bus. > > Modify C44 enumeration so that it also accepts -ENODEV and moves to C45
When enumerating an MDIO bus, an MDIO bus driver can return -ENODEV to a C22 read transaction to indicate there is no device at that address on the bus. Enumeration will then continue with the next address on the bus. Modify C44 enumeration so that it also accepts -ENODEV and moves to the next address on the bus, rather than consider -ENODEV as a fatal error. Convert the mv88e6xxx driver to return -ENODEV rather than 0xffff on read for families which do not support C45 bus transactions. This is more efficient, since enumeration will scan multiple devices at one address when 0xffff is returned, where as -EONDEV immediately jumps to the next address on the bus. Signed-off-by: Andrew Lunn <andrew@lunn.ch> --- Andrew Lunn (2): net: phy: c45 scanning: Don't consider -ENODEV fatal net: dsa: mv88e6xxx: Return -ENODEV when C22/C45 not supported drivers/net/dsa/mv88e6xxx/chip.c | 4 ++-- drivers/net/phy/phy_device.c | 8 ++++++-- 2 files changed, 8 insertions(+), 4 deletions(-) --- base-commit: d6aa8e0aa605a6baba08220e4a83fa2619a4c4d7 change-id: 20240203-unify-c22-c45-scan-error-handling-8012bb69bbf9 Best regards,