stable inclusion
from linux-4.19.99
commit 57738dd2709835fc45682afa0885a870d62ca51e

--------------------------------

[ Upstream commit 8f289805 ]

Fix fixed_phy not checking GPIO if no link_update callback
is registered.

In the original version all users registered a link_update
callback so the issue was masked.

Fixes: a5597008 ("phy: fixed_phy: Add gpio to determine link up/down.")
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NMoritz Fischer <mdf@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>