[PATCH v2 4/4] arm64: dts: rockchip: Make eeprom read-only for Radxa ROCK 3C/5A/5C

[FUKAUMI Naoki]

Make the BL24C16 EEPROM chips found on Radxa ROCK 3C, 5A and 5C SBCs
read-only, [1] [2] [3] because they contain factory-programmed data
that isn't supposed to be modified by the end users. [4]

[1] https://dl.radxa.com/rock3/docs/hw/3c/v1400/radxa_rock_3c_v1400_schematic.pdf p.13
[2] https://dl.radxa.com/rock5/5a/docs/hw/radxa_rock5a_V1.1_sch.pdf p.19
[3] https://dl.radxa.com/rock5/5c/docs/hw/v1100/radxa_rock_5c_schematic_v1100.pdf p.18
[4] https://github.com/radxa/u-boot/blob/next-dev-v2024.10/drivers/misc/radxa-i2c-eeprom.c

Fixes: ee219017ddb50 ("arm64: dts: rockchip: Add Radxa ROCK 3C")
Fixes: 89c880808cff8 ("arm64: dts: rockchip: add I2C EEPROM to rock-5a")
Fixes: 3ddf5cdb77e6e ("arm64: dts: rockchip: add Radxa ROCK 5C")
Signed-off-by: FUKAUMI Naoki <naoki at radxa.com>
---
Changes in v2:
- Reword commit message (Dragan Simic)
---
 arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts  | 1 +
 arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts | 1 +
 arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts b/arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts
index 80ac40555e023..fa28b32f69108 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts
@@ -466,6 +466,7 @@ eeprom: eeprom at 50 {
 		compatible = "belling,bl24c16a", "atmel,24c16";
 		reg = <0x50>;
 		pagesize = <16>;
+		read-only;
 		vcc-supply = <&vcca1v8_pmu>;
 	};
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
index 041a0fff22ccb..d844a842d4cce 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
@@ -233,6 +233,7 @@ eeprom: eeprom at 50 {
 		compatible = "belling,bl24c16a", "atmel,24c16";
 		reg = <0x50>;
 		pagesize = <16>;
+		read-only;
 		vcc-supply = <&vcc_3v3_pmu>;
 	};
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
index dd7317bab6135..665eecce063a8 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
@@ -325,6 +325,7 @@ eeprom at 50 {
 		compatible = "belling,bl24c16a", "atmel,24c16";
 		reg = <0x50>;
 		pagesize = <16>;
+		read-only;
 		vcc-supply = <&vcc_3v3_pmu>;
 	};
 };
-- 
2.43.0