[PATCH net] net: bcmgenet: Ensure MDIO unregistration has clocks enabled

[Florian Fainelli]

With support for Ethernet PHY LEDs having been added, while
unregistering a MDIO bus and its child device liks PHYs there may be
"late" accesses to the MDIO bus. One typical use case is setting the PHY
LEDs brightness to OFF for instance.

We need to ensure that the MDIO bus controller remains entirely
functional since it runs off the main GENET adapter clock.

Link: https://lore.kernel.org/all/20230617155500.4005881-1-andrew@xxxxxxx/
Fixes: 9a4e79697009 ("net: bcmgenet: utilize generic Broadcom UniMAC MDIO controller driver")
Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index be042905ada2..c1d670c92958 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -668,5 +668,7 @@ void bcmgenet_mii_exit(struct net_device *dev)
 	if (of_phy_is_fixed_link(dn))
 		of_phy_deregister_fixed_link(dn);
 	of_node_put(priv->phy_dn);
+	clk_prepare_enable(priv->clk);
 	platform_device_unregister(priv->mii_pdev);
+	clk_disable_unprepare(priv->clk);
 }
-- 
2.34.1

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