[PATCH 4/5] arm64: dts: renesas: spider-ethernet: Add ethernetN aliases for rswitch

[Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>]

The rswitch has three independent ports which each can act as a
separate interface with its own MAC address. Describe DT aliases
ethernet0, ethernet1, ethernet2 for each rswitch port in DT. This
allows U-Boot to insert MAC addresses from its environment variables
ethaddr/eth1addr/eth2addr into each rswitch port nodes, so Linux can
read and use one unique MAC address for each rswitch port.

Note that it is unlikely this would break existing rswitch driver
operation in the Linux kernel, because as of right now, the rswitch
driver already calls of_get_ethdev_address() for each port to read
out the MAC address out of each rswitch port DT node, and if that is
missing, it falls back to MAC address settings read from the hardware
itself, and if that also fails, it uses random MAC address.

Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>
---
Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-renesas-soc@xxxxxxxxxxxxxxx
---
 arch/arm64/boot/dts/renesas/r8a779f0-spider-ethernet.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a779f0-spider-ethernet.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0-spider-ethernet.dtsi
index 069f36ba53a4f..55c7c54411be4 100644
--- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-ethernet.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-ethernet.dtsi
@@ -5,6 +5,14 @@
  * Copyright (C) 2021 Renesas Electronics Corp.
  */
 
+/ {
+	aliases {
+		ethernet0 = &rswitchport0;
+		ethernet1 = &rswitchport1;
+		ethernet2 = &rswitchport2;
+	};
+};
+
 &eth_serdes {
 	status = "okay";
 };
-- 
2.45.2