[PATCH v3] arm64: dts: rockchip: Make eeprom read-only for Radxa ROCK 3C/5A/5C

[FUKAUMI Naoki]

The BL24C16 EEPROM implemented on the Radxa ROCK 3C, 5A, and 5C [1]
[2] [3] is designed to have data written during factory programming
(regardless of whether data is actually written or not), and we at
Radxa permit users to read the data but not write to it. [4]
Therefore, we will add a read-only property to the eeprom node.

[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 v3:
- Reword commit message
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 80ac40555e02..fa28b32f6910 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 045a853d39ec..0991f6a21190 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 b837c4e08cec..7fe42f4ff827 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