From: Janne Grunau <j@jannau.net>
Date: Tue, 3 Dec 2024 07:58:01 +0000 (+0100)
Subject: arm64: dts: apple: Add SPI NOR nvram partition to all devices
X-Git-Tag: v6.15-rc1~159^2~34^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3febe9de5ca5267618675650871a626d0901f8cb;p=thirdparty%2Fkernel%2Flinux.git

arm64: dts: apple: Add SPI NOR nvram partition to all devices

All known M1* and M2* devices use an identical SPI NOR flash
configuration with a partition containing a non-volatile key:value
storage. Use a .dtsi and include it for every device.
The nvram partition parameters itself depend on the version of the
installed Apple iboot boot loader. m1n1 will fill in the current values
provided by Apple's iboot.

Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://lore.kernel.org/r/20241203-asahi-spi-dt-v2-5-cd68bfaf0c84@jannau.net
Signed-off-by: Sven Peter <sven@svenpeter.dev>
---

diff --git a/arch/arm64/boot/dts/apple/spi1-nvram.dtsi b/arch/arm64/boot/dts/apple/spi1-nvram.dtsi
new file mode 100644
index 0000000000000..3df2fd3993b52
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/spi1-nvram.dtsi
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+//
+// Devicetree include for common spi-nor nvram flash.
+//
+// Apple uses a consistent configiguration for the nvram on all known M1* and
+// M2* devices.
+//
+// Copyright The Asahi Linux Contributors
+
+/ {
+	aliases {
+		nvram = &nvram;
+	};
+};
+
+&spi1 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0x0>;
+		spi-max-frequency = <25000000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			nvram: partition@700000 {
+				label = "nvram";
+				/* To be filled by the loader */
+				reg = <0x0 0x0>;
+				status = "disabled";
+			};
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi b/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
index 2e471dfe43cf8..22ebc78e120bf 100644
--- a/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
+++ b/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
@@ -119,3 +119,5 @@
 &fpwm0 {
 	status = "okay";
 };
+
+#include "spi1-nvram.dtsi"
diff --git a/arch/arm64/boot/dts/apple/t600x-j375.dtsi b/arch/arm64/boot/dts/apple/t600x-j375.dtsi
index 1e5a19e49b089..d5b985ad56793 100644
--- a/arch/arm64/boot/dts/apple/t600x-j375.dtsi
+++ b/arch/arm64/boot/dts/apple/t600x-j375.dtsi
@@ -126,3 +126,5 @@
 &pcie0_dart_3 {
 	status = "okay";
 };
+
+#include "spi1-nvram.dtsi"
diff --git a/arch/arm64/boot/dts/apple/t8103-jxxx.dtsi b/arch/arm64/boot/dts/apple/t8103-jxxx.dtsi
index 5988a4eb6efaa..8e82231acab59 100644
--- a/arch/arm64/boot/dts/apple/t8103-jxxx.dtsi
+++ b/arch/arm64/boot/dts/apple/t8103-jxxx.dtsi
@@ -90,3 +90,5 @@
 &nco_clkref {
 	clock-frequency = <900000000>;
 };
+
+#include "spi1-nvram.dtsi"
diff --git a/arch/arm64/boot/dts/apple/t8112-jxxx.dtsi b/arch/arm64/boot/dts/apple/t8112-jxxx.dtsi
index f5edf61113e7a..6da35496a4c88 100644
--- a/arch/arm64/boot/dts/apple/t8112-jxxx.dtsi
+++ b/arch/arm64/boot/dts/apple/t8112-jxxx.dtsi
@@ -79,3 +79,5 @@
 &nco_clkref {
 	clock-frequency = <900000000>;
 };
+
+#include "spi1-nvram.dtsi"