phy: renesas: r8a779f0-ether-serdes: Add .exit() ops

Add r8a779f0_eth_serdes_exit() to clear the initialized flag
for re-initializing this PHY if needed.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20231011081817.257113-3-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/renesas/r8a779f0-ether-serdes.c

@@ -261,6 +261,15 @@ static int r8a779f0_eth_serdes_init(struct phy *p)
 	return ret;
 }
 
+static int r8a779f0_eth_serdes_exit(struct phy *p)
+{
+	struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
+
+	channel->dd->initialized = false;
+
+	return 0;
+}
+
 static int r8a779f0_eth_serdes_hw_init_late(struct r8a779f0_eth_serdes_channel
 *channel)
 {
@@ -318,6 +327,7 @@ static int r8a779f0_eth_serdes_set_speed(struct phy *p, int speed)
 
 static const struct phy_ops r8a779f0_eth_serdes_ops = {
 	.init		= r8a779f0_eth_serdes_init,
+	.exit		= r8a779f0_eth_serdes_exit,
 	.power_on	= r8a779f0_eth_serdes_power_on,
 	.set_mode	= r8a779f0_eth_serdes_set_mode,
 	.set_speed	= r8a779f0_eth_serdes_set_speed,