[PATCH v3 2/3] ARM: dts: Add nvmem node for BCM2711 bootloader public key

["Ivan T. Ivanov" <iivanov@suse.de>]

From: Tim Gover <tim.gover@raspberrypi.com>

Make a copy of the bootloader secure-boot public key available to the OS
via an nvmem node. The placement information is populated by the
Raspberry Pi firmware[1] if a public key is present in the BCM2711
bootloader EEPROM.

[1] https://www.raspberrypi.com/documentation/computers/configuration.html#nvmem-nodes

Signed-off-by: Tim Gover <tim.gover@raspberrypi.com>
[iivanov] Added link to documentation.
Signed-off-by: Ivan T. Ivanov <iivanov@suse.de>
---
 arch/arm/boot/dts/bcm2711-rpi.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi.dtsi b/arch/arm/boot/dts/bcm2711-rpi.dtsi
index 98817a6675b9..e30fbe84f9c3 100644
--- a/arch/arm/boot/dts/bcm2711-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2711-rpi.dtsi
@@ -15,6 +15,7 @@ aliases {
 		ethernet0 = &genet;
 		pcie0 = &pcie0;
 		blconfig = &blconfig;
+		blpubkey = &blpubkey;
 	};
 };
 
@@ -67,6 +68,19 @@ blconfig: nvram@0 {
 		no-map;
 		status = "disabled";
 	};
+
+	/*
+	 * RPi4 will copy the binary public key blob (if present) from the bootloader
+	 * into memory for use by the OS.
+	 */
+	blpubkey: nvram@1 {
+		compatible = "raspberrypi,bootloader-public-key", "nvmem-rmem";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x0 0x0 0x0>;
+		no-map;
+		status = "disabled";
+	};
 };
 
 &v3d {
-- 
2.35.3