[PATCH] ARM: at91: sama5d27_som1_ek: populate MAC address from EEPROM

[Ahmad Fatoum]

Hello Sascha,

On 22.06.21 10:08, Ahmad Fatoum wrote:
> With the latest NVMEM enhancements merged, barebox networking core now
> always consults NVMEM cells referenced in the network controller
> device tree node before it falls back to randomizing a new address.
> 
> The SAM5D27-SOM1 has a 256 byte EEPROM, which holds a MAC address in its
> last 6 bytes. Describe this in the device tree, so boards using the SoM
> will get an unique MAC address assigned and fixed up into the kernel
> device tree. This change can be dropped again when/if the change is
> submitted and applied upstream.

This patch seems to have slipped through the cracks.

Cheers,
Ahmad

> 
> Reported-by: Alexander Dahl <ada at thorsis.com>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  arch/arm/dts/at91-sama5d27_som1.dtsi   | 18 ++++++++++++++++++
>  arch/arm/dts/at91-sama5d27_som1_ek.dts |  2 +-
>  2 files changed, 19 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/dts/at91-sama5d27_som1.dtsi
> 
> diff --git a/arch/arm/dts/at91-sama5d27_som1.dtsi b/arch/arm/dts/at91-sama5d27_som1.dtsi
> new file mode 100644
> index 000000000000..0d84c45f9263
> --- /dev/null
> +++ b/arch/arm/dts/at91-sama5d27_som1.dtsi
> @@ -0,0 +1,18 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +
> +#include "sama5d2.dtsi"
> +
> +&macb0 {
> +	nvmem-cells = <&macaddr>;
> +	nvmem-cell-names = "mac-address";
> +};
> +
> +&{/ahb/apb/i2c at f8028000/at24 at 50} {
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	macaddr: mac-address at fa {
> +		reg = <0xfa 6>;
> +		label = "mac-address";
> +	};
> +};
> diff --git a/arch/arm/dts/at91-sama5d27_som1_ek.dts b/arch/arm/dts/at91-sama5d27_som1_ek.dts
> index 97a326dd2b26..1a704b42680f 100644
> --- a/arch/arm/dts/at91-sama5d27_som1_ek.dts
> +++ b/arch/arm/dts/at91-sama5d27_som1_ek.dts
> @@ -4,7 +4,7 @@
>   */
>  
>  #include <arm/at91-sama5d27_som1_ek.dts>
> -#include "sama5d2.dtsi"
> +#include "at91-sama5d27_som1.dtsi"
>  
>  / {
>  	chosen {
> 


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |