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

[Alexander Dahl]

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 at thorsis.com>

Not sure why it worked with that older kernel, though.

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 at microchip.com hat am 17.02.2021 12:38 geschrieben:
> 
>  
> From: Claudiu Beznea <claudiu.beznea at 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 at microchip.com>
> Fixes: 2f61929eb10a ("ARM: dts: at91: at91-sama5d27_som1: fix PHY ID")
> Cc: Ludovic Desroches <ludovic.desroches at microchip.com>
> Signed-off-by: Nicolas Ferre <nicolas.ferre at microchip.com>
> Cc: <stable at 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 at f8008000 {
>  				pinctrl-0 = <&pinctrl_macb0_default>;
>  				phy-mode = "rmii";
>  
> -				ethernet-phy at 0 {
> -					reg = <0x0>;
> +				ethernet-phy at 7 {
> +					reg = <0x7>;
>  					interrupt-parent = <&pioA>;
>  					interrupts = <PIN_PD31 IRQ_TYPE_LEVEL_LOW>;
>  					pinctrl-names = "default";
> -- 
> 2.30.0
> 
> 
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