linux-kernel - Re: [PATCH 1/2] ARM: dts: meson8b: add the nvmem cell with the board's MAC address

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Message-ID: <9814939f-8580-c8f6-5c2f-7e64db60e6ae@baylibre.com>
Date:   Mon, 29 Jul 2019 09:11:43 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-amlogic@...ts.infradead.org, khilman@...libre.com
Cc:     linux.amoon@...il.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, ottuzzi@...il.com
Subject: Re: [PATCH 1/2] ARM: dts: meson8b: add the nvmem cell with the
 board's MAC address

Hi Martin,

On 27/07/2019 21:46, Martin Blumenstingl wrote:
> Amlogic's BSP kernel defines that all boards with a MAC address stored
> in the eFuse have it at offset 0x1b4. It is up to the board to
> decide whether to use this MAC address or not:
> - Odroid-C1 uses the MAC address from the eFuse
> - EC-100 seems to read the MAC address from eMMC
> 
> Add the nvmem cell which describes the Ethernet MAC address. Don't
> assign it to the Ethernet controller, because depending on the board the
> actual MAC address may be read from somewhere else.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>  arch/arm/boot/dts/meson8b.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
> index 30fca9bb4bbe..c7de58b71d08 100644
> --- a/arch/arm/boot/dts/meson8b.dtsi
> +++ b/arch/arm/boot/dts/meson8b.dtsi
> @@ -402,6 +402,10 @@
>  	clocks = <&clkc CLKID_EFUSE>;
>  	clock-names = "core";
>  
> +	ethernet_mac_address: mac@1b4 {
> +		reg = <0x1b4 0x6>;
> +	};

Is this a fixed position for all boards ? if not, I'll suggest moving
it to the odroid-c1 dt until you have more users.

Neil

> +
>  	temperature_calib: calib@1f4 {
>  		/* only the upper two bytes are relevant */
>  		reg = <0x1f4 0x4>;
>