Subject: [PATCH net-next v3 1/3] net: phy: add a new phy_device flag to keep preamble before sfd

From: Stefan Eichenberger <[email-masked]>
Date: Tue, 20 Jan 2026 21:30:02 +0100

From: Stefan Eichenberger <[email-masked]>

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 <[email-masked]>
---
 include/linux/phy.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index fbbe028cc4b7b..a978173c0e2a1 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -802,8 +802,9 @@ 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)
 
-- 
2.51.0