Re: [PATCH] ARM: dts: BCM53573: Fix address of Luxul XAP-1440's Ethernet PHY

[Florian Fainelli <florian.fainelli@broadcom.com>]

On 10/6/25 13:34, Rafał Miłecki wrote:
> W dniu 6.10.2025 o 18:09, Andrew Lunn pisze:
>> On Thu, Oct 02, 2025 at 09:48:52PM +0200, Rafał Miłecki wrote:
>>> From: Rafał Miłecki <rafal@milecki.pl>
>>>
>>> Luxul XAP-1440 has BCM54210E PHY at address 25.
>>>
>>> Fixes: 44ad82078069 ("ARM: dts: BCM53573: Fix Ethernet info for Luxul 
>>> devices")
>>> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
>>> ---
>>>   arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts 
>>> b/arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts
>>> index ac44c745bdf8..a39a021a3910 100644
>>> --- a/arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts
>>> +++ b/arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts
>>> @@ -55,8 +55,8 @@ &gmac0 {
>>>       mdio {
>>>           /delete-node/ switch@1e;
>>> -        bcm54210e: ethernet-phy@0 {
>>> -            reg = <0>;
>>> +        bcm54210e: ethernet-phy@25 {
>>> +            reg = <25>;
>>
>> Does this really not work, or is it relying on the PHY responding to 0
>> as a broadcast address?
> 
> Invalid PHY address was breaking Linux's support for Ethernet device.
> 
> Before this change:
> [    0.986560] bgmac_bcma bcma0:5: Found PHY addr: 25
> [    0.991913] mdio_bus bcma_mdio-0-0: MDIO device at address 0 is missing.
> [    1.024512] libphy: PHY bcma_mdio-0-0:19 not found
> [    1.029358] bgmac_bcma bcma0:5: PHY connection failed
> [    1.034514] bgmac_bcma bcma0:5: Cannot connect to phy

OK, so the SPROM told us the PHY was at address 25, but when we went on 
to identify the PHY at address 0, there was none, and so we could not 
connect to the PHY, that makes sense to me. Applied!
-- 
Florian