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readl() returns 32-bit value but Clause 22/45 registers are 16-bit wide. Masking with 0xFFFF avoids using garbage upper bits. Signed-off-by: Jack Ping CHNG <jchng@maxlinear.com> Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Link: https://patch.msgid.link/20250716030349.3796806-1-jchng@maxlinear.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>