linux-kernel - [PATCH] riscv: dts: sifive unmatched: Expose the board ID eeprom.

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Message-Id: <eaf9679c4c93b68fd8b7a427ceb8ef59387fe925.1637023980.git.plr.vincent@gmail.com>
Date:   Tue, 16 Nov 2021 00:52:57 +0000
From:   Vincent Pelletier <plr.vincent@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Qiu Wenbo <qiuwenbo@...inos.com.cn>,
        Yash Shah <yash.shah@...ive.com>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        David Abdurachmanov <david.abdurachmanov@...ive.com>
Subject: [PATCH] riscv: dts: sifive unmatched: Expose the board ID eeprom.

Mark it as read-only as it is factory-programmed with identifying
information, and no executable nor configuration:
- eth MAC address
- board model (PCB version, BoM version)
- board serial number
Accidental modification would cause misidentification which could brick
the board, so marking read-only seem like both a safe and non-constraining
choice.

Signed-off-by: Vincent Pelletier <plr.vincent@...il.com>
---
 arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
index 305a086e5207..cf8937708829 100644
--- a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
+++ b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
@@ -58,6 +58,16 @@ temperature-sensor@4c {
 		interrupts = <6 IRQ_TYPE_LEVEL_LOW>;
 	};
 
+	eeprom@54 {
+		compatible = "microchip,24c02", "atmel,24c02";
+		reg = <0x54>;
+		vcc-supply = <&vdd_bpro>;
+		label = "board-id";
+		pagesize = <16>;
+		read-only;
+		size = <256>;
+	};
+
 	pmic@58 {
 		compatible = "dlg,da9063";
 		reg = <0x58>;
-- 
2.33.1