linux-kernel - Re: [PATCH v7 02/14] dt-bindings: net: mediatek,net: update for mt7988

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Message-ID: <8C311FDD-094A-4F1C-AE26-7E3ABB337C14@public-files.de>
Date: Tue, 01 Jul 2025 12:33:46 +0200
From: Frank Wunderlich <frank-w@...lic-files.de>
To: Krzysztof Kozlowski <krzk@...nel.org>, Frank Wunderlich <linux@...web.de>
CC: MyungJoo Ham <myungjoo.ham@...sung.com>,
 Kyungmin Park <kyungmin.park@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>, Georgi Djakov <djakov@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
 Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Johnson Wang <johnson.wang@...iatek.com>,
 Arınç ÜNAL <arinc.unal@...nc9.com>,
 Landen Chao <Landen.Chao@...iatek.com>, DENG Qingfang <dqfext@...il.com>,
 Sean Wang <sean.wang@...iatek.com>, Daniel Golle <daniel@...rotopia.org>,
 Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>,
 linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v7 02/14] dt-bindings: net: mediatek,net: update for mt7988

Am 1. Juli 2025 08:41:42 MESZ schrieb Krzysztof Kozlowski <krzk@...nel.org>:
>On Sat, Jun 28, 2025 at 06:54:37PM +0200, Frank Wunderlich wrote:
>> From: Frank Wunderlich <frank-w@...lic-files.de>
>> 
>> Update binding for mt7988 which has 3 gmac and a sram for dma
>> operations.
>
>I asked why you are updating. You claim you update because it has 3
>GMAC... but that's irrelevant, because it is easy to answer with: it did
>not have 3 GMAC before?
>
>So same question: Provide real reason why you are making updates. That's
>why you have commit msg.

MT7988 had always 3 gmac,but no dts with ethernet
node till now.
As i try to upstream the dts,i fell over this.

Imho changing the regex for the mac subnodes was
simply forgotten to be updated on initial mt7988
support patch.

I try to rephrase it like this:

Binding was not aware for 3 MAC subnodes because
previous mediatek SoC had only 2. Change this to allow
3 GMAC in mt7988 devicetree.
>
>> 
>> MT7988 has 4 FE IRQs (currently only 2 are used) and 4 IRQs for use
>
>mt7988 or MT7988? gmac or GMAC? SRAM or SRAM? and so on... it is not
>easy to read and understand your commit msgs.

Ok,i always write those names in uppercase.

>> with RSS/LRO later.
>> 
>> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
>> ---
>> v6:
>> - split out the interrupt-names into separate patch
>> - update irq(name) min count to 4
>> - add sram-property
>> - drop second reg entry and minitems as there is only 1 item left again
>> 
>> v5:
>> - fix v4 logmessage and change description a bit describing how i get
>>   the irq count.
>> - update binding for 8 irqs with different names (rx,tx => fe0..fe3)
>>   including the 2 reserved irqs which can be used later
>> - change rx-ringX to pdmaX to be closer to hardware documentation
>> 
>> v4:
>> - increase max interrupts to 6 because of adding RSS/LRO interrupts (4)
>>   and dropping 2 reserved irqs (0+3) around rx+tx
>> - dropped Robs RB due to this change
>> - allow interrupt names
>> - add interrupt-names without reserved IRQs on mt7988
>>   this requires mtk driver patch:
>>   https://patchwork.kernel.org/project/netdevbpf/patch/20250616080738.117993-2-linux@fw-web.de/
>> 
>> v2:
>> - change reg to list of items
>> ---
>>  Documentation/devicetree/bindings/net/mediatek,net.yaml | 9 +++++++--
>>  1 file changed, 7 insertions(+), 2 deletions(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/net/mediatek,net.yaml b/Documentation/devicetree/bindings/net/mediatek,net.yaml
>> index 6672db206b38..74a139000f60 100644
>> --- a/Documentation/devicetree/bindings/net/mediatek,net.yaml
>> +++ b/Documentation/devicetree/bindings/net/mediatek,net.yaml
>> @@ -28,7 +28,8 @@ properties:
>>        - ralink,rt5350-eth
>>  
>>    reg:
>> -    maxItems: 1
>> +    items:
>> +      - description: Register for accessing the MACs.
>
>Why making this change? It's redundant and nothing in commit msg
>explains that.

I was instructed (where we had 2 regs in previous
Version) to name the regs...but as we have one reg
again,i can drop this change. Thought a description 
is better than a count.

>Best regards,
>Krzysztof
>

regards Frank