linux-kernel - [PATCH v5 14/14] arm64: dts: apple: j274: Expose PCI node for the Ethernet MAC address

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Message-Id: <20210929163847.2807812-15-maz@kernel.org>
Date:   Wed, 29 Sep 2021 17:38:47 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Stan Skowronek <stan@...ellium.com>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Sven Peter <sven@...npeter.dev>,
        Hector Martin <marcan@...can.st>,
        Robin Murphy <Robin.Murphy@....com>,
        Joey Gouly <joey.gouly@....com>,
        Joerg Roedel <joro@...tes.org>, kernel-team@...roid.com
Subject: [PATCH v5 14/14] arm64: dts: apple: j274: Expose PCI node for the Ethernet MAC address

At the moment, all the Minis running Linux have the same MAC
address (00:10:18:00:00:00), which is a bit annoying.

Expose the PCI node corresponding to the Ethernet device, and
declare a 'local-mac-address' property. The bootloader will update
it (m1n1 already has the required feature). And if it doesn't, then
the default value is already present in the DT.

This relies on forcing the bus number for each port so that the
endpoints connected to them are correctly numbered (and keeps dtc
quiet).

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 arch/arm64/boot/dts/apple/t8103-j274.dts | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8103-j274.dts b/arch/arm64/boot/dts/apple/t8103-j274.dts
index e0f6775b9878..33a80f9501dc 100644
--- a/arch/arm64/boot/dts/apple/t8103-j274.dts
+++ b/arch/arm64/boot/dts/apple/t8103-j274.dts
@@ -17,6 +17,7 @@ / {
 
 	aliases {
 		serial0 = &serial0;
+		ethernet0 = &ethernet0;
 	};
 
 	chosen {
@@ -43,3 +44,25 @@ memory@...000000 {
 &serial0 {
 	status = "okay";
 };
+
+/*
+ * Force the bus number assignments so that we can declare some of the
+ * on-board devices and properties that are populated by the bootloader
+ * (such as MAC addresses).
+ */
+&port00 {
+	bus-range = <1 1>;
+};
+
+&port01 {
+	bus-range = <2 2>;
+};
+
+&port02 {
+	bus-range = <3 3>;
+	ethernet0: pci@0,0 {
+		reg = <0x30000 0x0 0x0 0x0 0x0>;
+		/* To be filled by the loader */
+		local-mac-address = [00 10 18 00 00 00];
+	};
+};
-- 
2.30.2