Subject: [PATCH 1/2] ARM: at91/dt: describe rgmii ethernet phy connected to sama5d3xek boards

From: [email-masked] (Bo Shen)
Date: Wed, 25 Jun 2014 15:35:34 +0800

Hi Boris,

On 06/25/2014 03:30 PM, Boris BREZILLON wrote:
> Hello Bo,
>
> On 25/06/2014 08:59, Bo Shen wrote:
>> Hi Boris,
>>
>> On 06/25/2014 06:44 AM, Boris BREZILLON wrote:
>>> Add ethernet-phy node to specify phy address (on the MDIO bus) and phy
>>> interrupt (connected to pin PB25).
>>>
>>> Define board specific delays to apply to RGMII signals.
>>>
>>> Signed-off-by: Boris BREZILLON <[email-masked]>
>>> ---
>>>    arch/arm/boot/dts/sama5d3xcm.dtsi | 16 ++++++++++++++++
>>>    1 file changed, 16 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/sama5d3xcm.dtsi
>>> b/arch/arm/boot/dts/sama5d3xcm.dtsi
>>> index b0b1331..2185ad8 100644
>>> --- a/arch/arm/boot/dts/sama5d3xcm.dtsi
>>> +++ b/arch/arm/boot/dts/sama5d3xcm.dtsi
>>> @@ -34,6 +34,22 @@
>>>
>>>                macb0: ethernet at f0028000 {
>>>                    phy-mode = "rgmii";
>>> +                #address-cells = <1>;
>>> +                #size-cells = <0>;
>>> +
>>> +                ethernet-phy at 1 {
>>
>> The GMAC PHY address is 0x7 while not 0x1.
>
> Are you sure of that ? I checked sama5d3x-ek schematics.

On sama5d3x-ek schematic, it is EMAC PHY (ksz8051RNL, it's address is 
0x1), while not GMAC PHY. You should check the sama5d3x-CM schematic.

> On these schematics PHYAD0 is connected to a pull up resistor and
> PHYAD1/2 are connected to a pull down one.
> This gives PHYAD[4:0] = 0b00001 = 0x1.
> Is there some bootloader mechanisms that changes PHYAD[0-2] pin status
> and reset the PHY ?
>
>>
>>> +                    interrupt-parent = <&pioB>;
>>> +                    interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
>>> +                    reg = <1>;
>>
>> Nitpick: as usual, we will add "0x" prefix in reg property.
>
> Sure, I'll fix that.
>
>>
>>> +                    txen-skew-ps = <800>;
>>> +                    txc-skew-ps = <12000>;
>
> Should be 3000 (0xf * 200 ps) not 12000.
>
>>> +                    rxdv-skew-ps = <400>;
>>> +                    rxc-skew-ps = <12000>;
>
> Ditto.
>
> Best Regards,
>
> Boris

Best Regards,
Bo Shen