linux-kernel - Re: [PATCH 1/2] ARM: at91/dt: describe rgmii ethernet phy connected to sama5d3xek boards

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Date:	Wed, 25 Jun 2014 09:45:05 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Bo Shen <voice.shen@...el.com>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ARM: at91/dt: describe rgmii ethernet phy connected
 to sama5d3xek boards


On 25/06/2014 09:35, Bo Shen wrote:
> 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 <boris.brezillon@...e-electrons.com>
>>>> ---
>>>> 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@...28000 {
>>>> phy-mode = "rgmii";
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> +
>>>> + ethernet-phy@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.

I checked "Figure 5-16. RONETIX GEthernet ETH0" and "Figure 5-15. EMBEST
GEthernet ETH0" of this document "11180A–ATARM–30-Jan-13", which,
AFAICT, are RGMII phy schematics of CPU Modules.
I might have an old datasheet though.
If this is the case could you point out the new one ?

Thanks,

Boris



>
>> 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
>

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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