linux-kernel - Re: [PATCH v2 3/3] arm64: dts: rockchip: Add Luckfox Omni3576 Board support

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Message-ID: <46cbdabd-b0ed-4c9b-9f01-4d2d8eceac24@gmail.com>
Date: Sun, 4 May 2025 19:41:32 -0400
From: John Clark <inindev@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Jonas Karlman <jonas@...boo.se>, heiko@...ech.de, robh@...nel.org,
 conor+dt@...nel.org, detlev.casanova@...labora.com,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 devicetree@...r.kernel.org, krzk+dt@...nel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/3] arm64: dts: rockchip: Add Luckfox Omni3576 Board
 support

On 5/4/25 7:01 PM, Andrew Lunn wrote:
> On Sun, May 04, 2025 at 05:02:33PM -0400, John Clark wrote:
>> On 5/4/25 10:12 AM, Andrew Lunn wrote:
>>>>> +&gmac0 {
>>>>> +	clock_in_out = "output";
>>>>> +	phy-handle = <&rgmii_phy0>;
>>>>> +	phy-mode = "rgmii-rxid";
>>>>
>>>> See Andrew's remark on v1 of this patch.
>>>
>>> Hi John
>>>
>>> If you have questions, please ask. It is not a good idea to silently
>>> ignore reviewers comments. Either do something about it, ask
>>> questions, or politely argue why the reviewer is wrong, because
>>> sometimes we are.
>>>
>> Hi Andrew,
>> Thanks for your feedback and the link to the RGMII delays discussion. I
>> assumed you suggested switching to phy-mode = "rgmii-id" from rgmii-rxid.
>> The vendor’s downstream kernel uses rgmii-rxid with tx_delay = <0x20>, as
>> shown in my post. I tried rgmii-id and removed tx_delay, but the interface
>> failed to get a DHCP address. Reverting to rgmii-rxid with the delay
>> restored functionality. Any advice on correctly configuring rgmii-id or
>> adjusting delays for this board?
> 
> What PHY is it? Are you using the correct PHY driver for it, or
> genphy?
> 
MAE0621A-Q3C
http://www.maxio-tech.com/product/12928/12929/12930/12931.html

> rk3576-rock-4d.dts and rk3576-armsom-sige5.dts show that it is
> possible to use this SoC with the correct 'rgmii-id',
> 
> 	Andrew