net: sparx5: verify RGMII speeds

When doing a port config, we verify the port speed against the PHY mode
and supported speeds of that PHY mode. Add checks for the four RGMII phy
modes: RGMII, RGMII_ID, RGMII_TXID and RGMII_RXID.

Reviewed-by: Steen Hegelund <[email protected]>
Reviewed-by: Horatiu Vultur <[email protected]>
Tested-by: Robert Marko <[email protected]>
Signed-off-by: Daniel Machon <[email protected]>
Link: https://patch.msgid.link/20241220-sparx5-lan969x-switch-driver-4-v5-6-fa8ba5dff732@microchip.com
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Danielmachon

drivers/net/ethernet/microchip/sparx5/sparx5_port.c

@@ -257,6 +257,15 @@ static int sparx5_port_verify_speed(struct sparx5 *sparx5,
 		     conf->speed != SPEED_25000))
 			return sparx5_port_error(port, conf, SPX5_PERR_SPEED);
 		break;
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		if (conf->speed != SPEED_1000 &&
+		    conf->speed != SPEED_100 &&
+		    conf->speed != SPEED_10)
+			return sparx5_port_error(port, conf, SPX5_PERR_SPEED);
+		break;
 	default:
 		return sparx5_port_error(port, conf, SPX5_PERR_IFTYPE);
 	}