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Subject: Re: [PATCH] arm64: dts: rockchip: add EEPROM node for NanoPi R4S
To:     Tianling Shen <cnsztl@gmail.com>, Rob Herring <robh+dt@kernel.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Marty Jones <mj8263788@gmail.com>, Pavel Machek <pavel@ucw.cz>
Cc:     devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20210607081727.4723-1-cnsztl@gmail.com>
From:   Johan Jonker <jbx6244@gmail.com>
Message-ID: <9258ab23-ef65-2c3d-f0d2-ca5f77d7c12a@gmail.com>
Date:   Mon, 7 Jun 2021 11:14:23 +0200
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Hi Tianling,

On 6/7/21 10:17 AM, Tianling Shen wrote:
> NanoPi R4S has a EEPROM attached to the 2nd I2C bus (U92), which
> stores the MAC address.
> 
> Signed-off-by: Tianling Shen <cnsztl@gmail.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> index cef4d18b599d..4a82f50a07c5 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> @@ -68,6 +68,15 @@
>  	status = "disabled";
>  };
>  
> +&i2c2 {
> +	eeprom@51 {
> +		compatible = "microchip,24c02", "atmel,24c02";
> +		reg = <0x51>;
> +		pagesize = <16>;

> +		read-only; /* This holds our MAC */

The mainline dts files should be generic I think.
Any comment about "use", partitions or write ability should be avoided.
It's up the user.

Johan

> +	};
> +};
> +
>  &i2c4 {
>  	status = "disabled";
>  };
>