[PATCH v2 3/3] arm64: dts: rockchip: Add onboard EEPROM for Radxa E20C

[Jonas Karlman]

On 2025-04-17 14:01, Yao Zi wrote:
> Radxa E20C ships an onboard I2C EEPROM for storing production
> information. Enable it in devicetree.
> 
> Signed-off-by: Yao Zi <ziyao at disroot.org>

Reading from the EEPROM on my E20C works:

  $ hexdump -C /sys/devices/platform/soc/ffa58000.i2c/i2c-1/1-0050/1-00500/nvmem
  00000000  52 41 44 58 01 00 03 00  00 01 00 00 01 00 01 00  |RADX............|
  00000010  58 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |X...............|
  00000020  00 00 00 00 00 00 00 00  20 20 52 61 64 78 61 20  |........  Radxa |
  00000030  54 65 63 68 6e 6f 6c 6f  67 79 20 43 6f 2e 2c 20  |Technology Co., |
  00000040  4c 74 64 2e 00 00 00 00  00 00 44 31 45 38 31 30  |Ltd.......D1E810|
  00000050  4f 32 52 32 39 58 34 59  36 00 00 00 00 00 00 00  |O2R29X4Y6.......|
  00000060  00 00 00 00 00 00 00 00  00 00 9e 69 04 00 02 00  |...........i....|
  00000070  0c 00 00 00 01 00 56 31  2e 31 30 32 00 00 ed 09  |......V1.102....|
  00000080  05 00 03 00 78 00 00 00  01 00 30 00 00 00 00 00  |....x.....0.....|
  00000090  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 e0  |................|
  000000a0  4c 0d 0a 5c 00 e0 4c 0d  0a 5b 00 00 00 00 00 00  |L..\..L..[......|
  000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  *
  000000f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 cf 50  |...............P|

So this is:

Reviewed-by: Jonas Karlman <jonas at kwiboo.se>

Regards,
Jonas

> ---
>  arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> index 57a446b5cbd6..6e77f7753ff7 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> @@ -110,6 +110,20 @@ vcc5v0_sys: regulator-5v0-vcc-sys {
>  	};
>  };
>  
> +&i2c1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c1m0_xfer>;
> +	status = "okay";
> +
> +	eeprom at 50 {
> +		compatible = "belling,bl24c16a", "atmel,24c16";
> +		reg = <0x50>;
> +		pagesize = <16>;
> +		read-only;
> +		vcc-supply = <&vcc_3v3>;
> +	};
> +};
> +
>  &pinctrl {
>  	gpio-keys {
>  		user_key: user-key {