[PATCH 3/3] ARM: stm32: Add MAC address readout from fuses on DH STM32MP1 DHSOM

[Patrice CHOTARD]

On 10/27/25 18:25, Patrice CHOTARD wrote:
> 
> 
> On 10/23/25 23:48, Marek Vasut wrote:
>> Add support for reading out the MAC address from SoC fuses on DH STM32MP1 DHSOM.
>> The DH STM32MP1 DHSOM may contain external ethernet MACs, which benefit from the
>> MAC address stored in SoC fuses as well, handle those consistently. This however
>> means the architecture setup_mac_address() cannot be used and instead a simpler
>> local fuse read out is implemented in the board file.
>>
>> Signed-off-by: Marek Vasut <marek.vasut at mailbox.org>
>> ---
>> Cc: Patrice Chotard <patrice.chotard at foss.st.com>
>> Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
>> Cc: Tom Rini <trini at konsulko.com>
>> Cc: u-boot at dh-electronics.com
>> Cc: u-boot at lists.denx.de
>> Cc: uboot-stm32 at st-md-mailman.stormreply.com
>> ---
>>  board/dhelectronics/dh_stm32mp1/board.c | 29 +++++++++++++++++++++++++
>>  1 file changed, 29 insertions(+)
>>
>> diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
>> index 065d2f338c2..c18f1911fe4 100644
>> --- a/board/dhelectronics/dh_stm32mp1/board.c
>> +++ b/board/dhelectronics/dh_stm32mp1/board.c
>> @@ -119,6 +119,29 @@ static bool dh_stm32_mac_is_in_ks8851(void)
>>  	return false;
>>  }
>>  
>> +static int dh_stm32_get_mac_from_fuse(unsigned char *enetaddr, int index)
>> +{
>> +	struct udevice *dev;
>> +	u8 otp[12];
>> +	int ret;
>> +
>> +	ret = uclass_get_device_by_driver(UCLASS_MISC,
>> +					  DM_DRIVER_GET(stm32mp_bsec),
>> +					  &dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC), otp, sizeof(otp));
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	memcpy(enetaddr, otp + ARP_HLEN * index, ARP_HLEN);
>> +	if (!is_valid_ethaddr(enetaddr))
>> +		return -EINVAL;
>> +
>> +	return 0;
>> +}
>> +
>>  static int dh_stm32_setup_ethaddr(struct eeprom_id_page *eip)
>>  {
>>  	unsigned char enetaddr[6];
>> @@ -129,6 +152,9 @@ static int dh_stm32_setup_ethaddr(struct eeprom_id_page *eip)
>>  	if (dh_get_mac_is_enabled("ethernet0"))
>>  		return 0;
>>  
>> +	if (!dh_stm32_get_mac_from_fuse(enetaddr, 0))
>> +		goto out;
>> +
>>  	if (!dh_get_value_from_eeprom_buffer(DH_MAC0, enetaddr, sizeof(enetaddr), eip))
>>  		goto out;
>>  
>> @@ -154,6 +180,9 @@ static int dh_stm32_setup_eth1addr(struct eeprom_id_page *eip)
>>  	if (dh_stm32_mac_is_in_ks8851())
>>  		return 0;
>>  
>> +	if (!dh_stm32_get_mac_from_fuse(enetaddr, 1))
>> +		goto out;
>> +
>>  	if (!dh_get_value_from_eeprom_buffer(DH_MAC1, enetaddr, sizeof(enetaddr), eip))
>>  		goto out;
>>  
> 
> Hi 
> 
> Reviewed-by: Patrice Chotard <patrice.chotard at foss.st.com>
> 
> Thanks
> Patrice
Applied to u-boot-stm32/master

Thanks
Patrice