linux-kernel - [PATCH] dt-bindings: firmware: coreboot: Document optional device specific properties

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Message-ID: <20251119071126.1719405-1-wenst@chromium.org>
Date: Wed, 19 Nov 2025 15:11:25 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	devicetree@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	Julius Werner <jwerner@...omium.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: firmware: coreboot: Document optional device specific properties

Coreboot, or the ChromeOS second stage bootloader, depthcharge, will
insert device specific properties into the coreboot firmware node when
there are valid values.

Document these properties in the binding.

Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 Documentation/devicetree/bindings/firmware/coreboot.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/coreboot.txt b/Documentation/devicetree/bindings/firmware/coreboot.txt
index 4c955703cea8..0d04ea482aa9 100644
--- a/Documentation/devicetree/bindings/firmware/coreboot.txt
+++ b/Documentation/devicetree/bindings/firmware/coreboot.txt
@@ -21,6 +21,15 @@ Required properties:
 	0xc0389481 that resides in the topmost 8 bytes of the area.
 	See coreboot's src/include/imd.h for details.
 
+Optional properties:
+- board-id: Contains the board revision number.
+- ram-code: Contains the board's DRAM configuration type.
+- sku-id: Contains the device variant SKU ID.
+- fw-config: Contains the device variant FW config value.
+
+The optional properties are only populated if the values parsed by coreboot
+are valid.
+
 Example:
 	firmware {
 		ranges;
-- 
2.52.0.rc1.455.g30608eb744-goog