linux-kernel - [PATCH 4/6] ARM: dts: bcm2711: Expose boot-loader configuration

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Date:   Tue, 15 Dec 2020 16:56:24 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     srinivas.kandagatla@...aro.org,
        Saenz Julienne <nsaenzjulienne@...e.de>,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        catalin.marinas@....com, will@...nel.org,
        tim.gover@...pberrypi.com, phil@...pberrypi.com
Subject: [PATCH 4/6] ARM: dts: bcm2711: Expose boot-loader configuration

RPi4's co-processor will copy the board's bootloader configuration in
memory. Expose it to user-space by using 'nvmem-rmem'.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index c58e58e8ce39..261169eb5e3b 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -26,6 +26,17 @@ aliases {
 		ethernet0 = &genet;
 		pcie0 = &pcie0;
 		eeprom = &eeprom;
+		fw_config = &fw_config;
+	};
+
+	fw_config: fw-config {
+		compatible = "nvmem-rmem";
+		memory-region = <&eeprom>;
+		/*
+		 * Will be enabled by the bootloader if the reserved memory
+		 * region is valid.
+		 */
+		status = "disabled";
 	};
 
 	leds {
-- 
2.29.2