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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>