linux-kernel - [PATCH AUTOSEL 5.15 25/29] riscv: dts: sifive unmatched: Expose the board ID eeprom

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Date:   Mon, 20 Dec 2021 20:57:46 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vincent Pelletier <plr.vincent@...il.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Sasha Levin <sashal@...nel.org>, robh+dt@...nel.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, qiuwenbo@...inos.com.cn,
        yash.shah@...ive.com, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 25/29] riscv: dts: sifive unmatched: Expose the board ID eeprom

From: Vincent Pelletier <plr.vincent@...il.com>

[ Upstream commit 8120393b74b31bbaf293f59896de6b0d50febc48 ]

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>
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 a788b99638af8..7ea1c8da5fb2e 100644
--- a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
+++ b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
@@ -63,6 +63,16 @@ 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>;
-- 
2.34.1