net: phy: Validate PHY LED OPs presence before registering

Validate PHY LED OPs presence before registering and parsing them.
Defining LED nodes for a PHY driver that actually doesn't supports them
is redundant and useless.

It's also the case with Generic PHY driver used and a DT having LEDs
node for the specific PHY.

Skip it and report the error with debug print enabled.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241008194718.9682-1-ansuelsmth@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/phy/phy_device.c

@@ -3420,6 +3420,16 @@ static int of_phy_leds(struct phy_device *phydev)
 	if (!leds)
 		return 0;
 
+	/* Check if the PHY driver have at least an OP to
+	 * set the LEDs.
+	 */
+	if (!(phydev->drv->led_brightness_set ||
+	      phydev->drv->led_blink_set ||
+	      phydev->drv->led_hw_control_set)) {
+		phydev_dbg(phydev, "ignoring leds node defined with no PHY driver support\n");
+		goto exit;
+	}
+
 	for_each_available_child_of_node_scoped(leds, led) {
 		err = of_phy_led(phydev, led);
 		if (err) {
@@ -3429,6 +3439,7 @@ static int of_phy_leds(struct phy_device *phydev)
 		}
 	}
 
+exit:
 	of_node_put(leds);
 	return 0;
 }