From b5be30badf17dd728033b208e232aa9ee3fd5c11 Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Tue, 22 Jun 2021 10:08:11 +0200 Subject: ARM: at91: sama5d27_som1_ek: populate MAC address from EEPROM 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. Reported-by: Alexander Dahl Signed-off-by: Ahmad Fatoum Link: https://lore.barebox.org/20210622080811.28335-1-a.fatoum@pengutronix.de Signed-off-by: Sascha Hauer --- 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 (limited to 'arch/arm/dts') diff --git a/arch/arm/dts/at91-sama5d27_som1.dtsi b/arch/arm/dts/at91-sama5d27_som1.dtsi new file mode 100644 index 0000000000..0d84c45f92 --- /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@f8028000/at24@50} { + #address-cells = <1>; + #size-cells = <1>; + + macaddr: mac-address@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 97a326dd2b..1a704b4268 100644 --- a/arch/arm/dts/at91-sama5d27_som1_ek.dts +++ b/arch/arm/dts/at91-sama5d27_som1_ek.dts @@ -4,7 +4,7 @@ */ #include -#include "sama5d2.dtsi" +#include "at91-sama5d27_som1.dtsi" / { chosen { -- cgit v1.2.3