ARM: dts: bcm2710: replace lan78xx downstream EEE properties with eee-broken

Remove the downstream microchip,eee-enabled and microchip,tx-lpi-timer
properties from the Pi 3B+ PHY node. These were consumed by the
downstream lan78xx driver patches which have been reverted now that
upstream (since v6.17) integrates EEE via the phylink LPI API with
eee_enabled_default=true and lpi_timer_default=50.

Replace the eee dtparam with standard eee-broken-1000t/eee-broken-100tx
properties. Setting dtparam=eee=off adds the eee-broken properties to
prevent EEE negotiation. EEE is enabled by default.

Drop the tx_lpi_timer dtparam as the LPI timer is now managed by
phylink and configurable via ethtool --set-eee.

Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>

Author: nbuchwitz

arch/arm/boot/dts/broadcom/bcm2710-rpi-3-b-plus.dts

@@ -258,8 +258,6 @@
 };
 
 &eth_phy {
-	microchip,eee-enabled;
-	microchip,tx-lpi-timer = <600>; /* non-aggressive*/
 	microchip,downshift-after = <2>;
 };
 
@@ -285,8 +283,8 @@ i2c_csi_dsi0: &i2c0 {
 		pwr_led_activelow = <&led_pwr>,"gpios:8";
 		pwr_led_trigger = <&led_pwr>,"linux,default-trigger";
 
-		eee = <&eth_phy>,"microchip,eee-enabled?";
-		tx_lpi_timer = <&eth_phy>,"microchip,tx-lpi-timer:0";
+		eee = <&eth_phy>,"eee-broken-1000t!",
+		      <&eth_phy>,"eee-broken-100tx!";
 		eth_led0 = <&eth_phy>,"microchip,led-modes:0";
 		eth_led1 = <&eth_phy>,"microchip,led-modes:4";
 		eth_downshift_after = <&eth_phy>,"microchip,downshift-after:0";

arch/arm/boot/dts/overlays/README

@@ -233,8 +233,8 @@ Params:
         drm_fb2_vc4             Assign /dev/fb2 to the vc4 outputs
 
         eee                     Enable Energy Efficient Ethernet support for
-                                compatible devices (default "on"). See also
-                                "tx_lpi_timer". Pi3B+, Pi4, CM4, Pi5 and CM5.
+                                compatible devices (default "on").
+                                Pi3B+, Pi4, CM4, Pi5 and CM5.
 
         enable_eeprom           Set to "on" to enable the onboard bootloader
                                 EEPROM by driving GPIO 57 low
@@ -455,10 +455,6 @@ Params:
         suspend                 Make the power button trigger a suspend rather
                                 than a power-off (2712 only, default "off")
 
-        tx_lpi_timer            Set the delay in microseconds between going idle
-                                and entering the low power state (default 600).
-                                Requires EEE to be enabled - see "eee".
-
         uart0                   Set to "off" to disable uart0 (default "on")
 
         uart0_console           Move the kernel boot console to UART0 on pins