net: phy: add a new phy_device flag to keep preamble before sfd

Add a new flag, PHY_F_KEEP_PREAMBLE_BEFORE_SFD, to indicate that the PHY
shall not remove the preamble before the SFD if it supports it. MACs
that do not support receiving frames without a preamble can set this
flag.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260120203905.23805-2-eichest@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 5972f19af16dad29f24758914c8a2c979f9d6f29..6f9979a26892d19caba5d383ff66a7e78fc8374b 100644 (file)
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -810,8 +810,9 @@ struct phy_device {
 };
 
 /* Generic phy_device::dev_flags */
-#define PHY_F_NO_IRQ           0x80000000
-#define PHY_F_RXC_ALWAYS_ON    0x40000000
+#define PHY_F_NO_IRQ                   0x80000000
+#define PHY_F_RXC_ALWAYS_ON            0x40000000
+#define PHY_F_KEEP_PREAMBLE_BEFORE_SFD 0x20000000
 
 #define to_phy_device(__dev)   container_of_const(to_mdio_device(__dev), struct phy_device, mdio)