Re: [PATCH] ARM: dts: at91-sama5d27_som1: fix phy address to 7

[Nicolas Ferre <nicolas.ferre@microchip.com>]

Alexander, Ahmad,

On 23/03/2021 at 11:55, Ahmad Fatoum wrote:
> Hello Alexander,
> 
> On 23.03.21 11:45, Alexander Dahl wrote:
>> Hei hei,
>>
>> I could not get ethernet to work on SAMA5D27-SOM1-EK1 with kernels v5.10 and v5.11 built by a recent ptxdist based DistroKit BSP, while it used to work with an older v4.19 kernel. Just applying this patch to the tree made ethernet working again, thus:
>>
>> Tested-by: Alexander Dahl <ada@thorsis.com>
>>
>> Not sure why it worked with that older kernel, though.
> 
> Thanks for investigating! Seems that somehow PHY broadcast worked on this
> board with older kernels (and current barebox), but no longer does with
> newer kernels.
> 
> A bisection could shed some light onto what broke this.
> 
> As the KSZ8081 driver disables broadcast in the phy config init, this change
> looks appropriate regardless. The fixes tag doesn't refer to an upstream
> commit though. This should probably read:
> Fixes: af690fa37e39 ("ARM: dts: at91: at91-sama5d27_som1: add sama5d27 SoM1 support")

I didn't noticed that on my side.

> With this addressed:
> 
> Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

Thanks a lot for your feedback.

> You could send a proper patch and stick your S-o-b under it.

Actually this patch is already in arm-soc tree here:

https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/commit/?h=arm/fixes&id=221c3a09ddf70a0a51715e6c2878d8305e95c558

So I cannot add tags anymore to it, sorry.

Best regards,
   Nicolas

>> I added Ahmad to Cc, he added board support to DistroKit for that board, and might want to know. And I added the devicetree list to Cc, I wondered why the patch was not there and get_maintainers.pl proposed it.
>>
>> Thanks for fixing this and greetings
>> Alex
>>
>>> nicolas.ferre@microchip.com hat am 17.02.2021 12:38 geschrieben:
>>>
>>>
>>> From: Claudiu Beznea <claudiu.beznea@microchip.com>
>>>
>>> Fix the phy address to 7 for Ethernet PHY on SAMA5D27 SOM1. No
>>> connection established if phy address 0 is used.
>>>
>>> The board uses the 24 pins version of the KSZ8081RNA part, KSZ8081RNA
>>> pin 16 REFCLK as PHYAD bit [2] has weak internal pull-down.  But at
>>> reset, connected to PD09 of the MPU it's connected with an internal
>>> pull-up forming PHYAD[2:0] = 7.
>>>
>>> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
>>> Fixes: 2f61929eb10a ("ARM: dts: at91: at91-sama5d27_som1: fix PHY ID")
>>> Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
>>> Cc: <stable@vger.kernel.org> # 4.14+
>>> ---
>>>   arch/arm/boot/dts/at91-sama5d27_som1.dtsi | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/at91-sama5d27_som1.dtsi b/arch/arm/boot/dts/at91-sama5d27_som1.dtsi
>>> index 1b1163858b1d..e3251f3e3eaa 100644
>>> --- a/arch/arm/boot/dts/at91-sama5d27_som1.dtsi
>>> +++ b/arch/arm/boot/dts/at91-sama5d27_som1.dtsi
>>> @@ -84,8 +84,8 @@ macb0: ethernet@f8008000 {
>>>                               pinctrl-0 = <&pinctrl_macb0_default>;
>>>                               phy-mode = "rmii";
>>>
>>> -                            ethernet-phy@0 {
>>> -                                    reg = <0x0>;
>>> +                            ethernet-phy@7 {
>>> +                                    reg = <0x7>;
>>>                                       interrupt-parent = <&pioA>;
>>>                                       interrupts = <PIN_PD31 IRQ_TYPE_LEVEL_LOW>;
>>>                                       pinctrl-names = "default";
>>> --
>>> 2.30.0
>>>
>>>
>>> _______________________________________________
>>> linux-arm-kernel mailing list
>>> linux-arm-kernel@lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
> 
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-- 
Nicolas Ferre