[PATCH net-next] microchip: lan865x: add ndo_eth_ioctl handler to enable PHY ioctl support

[Parthiban Veerasooran <parthiban.veerasooran@microchip.com>]

Introduce support for standard MII ioctl operations in the LAN865x
Ethernet driver by implementing the .ndo_eth_ioctl callback. This allows
userspace tools such as ethtool and mii-tool to perform PHY register
access using commands like SIOCGMIIREG and SIOCSMIIREG.

The new lan865x_eth_ioctl() function forwards these ioctl calls to the
PHY layer through phy_mii_ioctl() when the network interface is up.

This feature enables improved diagnostics and PHY configuration
capabilities from userspace.

Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>
---
 drivers/net/ethernet/microchip/lan865x/lan865x.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan865x/lan865x.c b/drivers/net/ethernet/microchip/lan865x/lan865x.c
index 84c41f193561..7f586f9558ff 100644
--- a/drivers/net/ethernet/microchip/lan865x/lan865x.c
+++ b/drivers/net/ethernet/microchip/lan865x/lan865x.c
@@ -320,12 +320,22 @@ static int lan865x_net_open(struct net_device *netdev)
 	return 0;
 }
 
+static int lan865x_eth_ioctl(struct net_device *netdev, struct ifreq *rq,
+			     int cmd)
+{
+	if (!netif_running(netdev))
+		return -EINVAL;
+
+	return phy_mii_ioctl(netdev->phydev, rq, cmd);
+}
+
 static const struct net_device_ops lan865x_netdev_ops = {
 	.ndo_open		= lan865x_net_open,
 	.ndo_stop		= lan865x_net_close,
 	.ndo_start_xmit		= lan865x_send_packet,
 	.ndo_set_rx_mode	= lan865x_set_multicast_list,
 	.ndo_set_mac_address	= lan865x_set_mac_address,
+	.ndo_eth_ioctl          = lan865x_eth_ioctl,
 };
 
 static int lan865x_probe(struct spi_device *spi)

base-commit: a7bd72158063740212344fad5d99dcef45bc70d6
-- 
2.34.1