netdev - [PATCH net-next v2 4/4] net: ethernet: renesas: rswitch: Add phy_power

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Date:   Tue, 10 Jan 2023 14:02:06 +0900
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: [PATCH net-next v2 4/4] net: ethernet: renesas: rswitch: Add phy_power_{on,off}() calling

Some Ethernet PHYs (like marvell10g) will decide the host interface
mode by the media-side speed. So, the rswitch driver needs to
initialize one of the Ethernet SERDES (r8a779f0-eth-serdes) ports
after linked the Ethernet PHY up. The r8a779f0-eth-serdes driver has
.init() for initializing all ports and .power_on() for initializing
each port. So, add phy_power_{on,off} calling for it.

Notes that in-band mode will not work because the initialization
is not completed. So, output error message if in-band mode.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
 drivers/net/ethernet/renesas/rswitch.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 5a8a0c48dfd3..c027c2be9151 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -1174,12 +1174,20 @@ static void rswitch_mac_config(struct phylink_config *config,
 			       unsigned int mode,
 			       const struct phylink_link_state *state)
 {
+	struct net_device *ndev = to_net_dev(config->dev);
+
+	if (mode == MLO_AN_INBAND)
+		netdev_err(ndev, "Link up/down will not work because in-band mode\n");
 }
 
 static void rswitch_mac_link_down(struct phylink_config *config,
 				  unsigned int mode,
 				  phy_interface_t interface)
 {
+	struct net_device *ndev = to_net_dev(config->dev);
+	struct rswitch_device *rdev = netdev_priv(ndev);
+
+	phy_power_off(rdev->serdes);
 }
 
 static void rswitch_mac_link_up(struct phylink_config *config,
@@ -1187,7 +1195,11 @@ static void rswitch_mac_link_up(struct phylink_config *config,
 				phy_interface_t interface, int speed,
 				int duplex, bool tx_pause, bool rx_pause)
 {
+	struct net_device *ndev = to_net_dev(config->dev);
+	struct rswitch_device *rdev = netdev_priv(ndev);
+
 	/* Current hardware cannot change speed at runtime */
+	phy_power_on(rdev->serdes);
 }
 
 static const struct phylink_mac_ops rswitch_phylink_ops = {
-- 
2.25.1