net: phy: Add mac_supports_eee variable for EEE support and LPI handling

This commit introduces a new variable, mac_supports_eee, to the PHY
layer. This variable is used to indicate if a MAC provides EEE support
or is responsible for Low Power Idle (LPI) handling. The
mac_supports_eee variable should be used in conjunction with
is_smart_eee_phy to make proper configuration decisions based on the
capabilities of both the PHY and MAC.

By adding the mac_supports_eee variable, PHY drivers and the PHYlib
framework can better coordinate EEE and LPI management between the PHY
and MAC.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

include/linux/phy.h

@@ -548,6 +548,7 @@ struct macsec_ops;
  * @is_on_sfp_module: Set true if PHY is located on an SFP module.
  * @mac_managed_pm: Set true if MAC driver takes of suspending/resuming PHY
  * @is_smart_eee_phy: Set true if PHY is a Smart EEE PHY
+ * @mac_supports_eee: Set true if MAC supports EEE
  * @state: State of the PHY for management purposes
  * @dev_flags: Device-specific flags used by the PHY driver.
  *
@@ -644,6 +645,7 @@ struct phy_device {
 	unsigned is_on_sfp_module:1;
 	unsigned mac_managed_pm:1;
 	unsigned is_smart_eee_phy:1;
+	unsigned mac_supports_eee:1;
 
 	unsigned autoneg:1;
 	/* The most recently read link state */