linux-kernel - Re: [PATCH 1/2] dt-bindings: soc: ti: pruss: allow ethernet controller in ICSSG node

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Message-ID: <14bebdc5-3239-47fe-b8cc-68daba278d73@kernel.org>
Date: Thu, 20 Jun 2024 10:29:35 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux@...tq-group.com,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
 Suman Anna <s-anna@...com>
Subject: Re: [PATCH 1/2] dt-bindings: soc: ti: pruss: allow ethernet
 controller in ICSSG node

On 20/06/2024 10:26, Matthias Schiffer wrote:
> On Thu, 2024-06-20 at 09:24 +0200, Krzysztof Kozlowski wrote:
>> On 19/06/2024 13:24, Matthias Schiffer wrote:
>>> While the current Device Trees for TI EVMs configure the PRUSS Ethernet
>>> controller as a toplevel node with names like "icssg1-eth", allowing to
>>> make it a subnode of the ICSSG has a number of advantages:
>>
>> What is ICSSG? The sram or ti,prus from the ethernet schema?
> 
> ICSSG (Industrial Communication Subsystem (Group?)) is the main device described by the
> ti,pruss.yaml binding (ICSS and PRUSS are different variants of similar IP cores); it is the
> container for the individual PRU, TXPRU and RTU cores which are referenced by the ti,prus
> node of the Ethernet schema.
> 
> The entirety of PRU, TXPRU and RTU cores of one ICSSG, each with its own firmware, forms one
> Ethernet controller, which is not quite a hardware device, but also not a fully virtual software
> device.

So it is not really child of ICSSG.

> 
> The Ethernet controller only exists through the various ICSS subcores, so it doesn't have an MMIO
> address of its own. As described, the existing Device Trees define it as a toplevel non-MMIO node;
> we propose to allow it as a non-MMIO child node of the ICSSG container instead.
> 
> If you consider moving the ethernet node into the ICSSG node a bad approach, we will drop this patch
> and try to find a different solution to our issue (the Ethernet device staying in deferred state
> forever when the ICSSG node is disabled on Linux).

Just disable the ethernet. That's the expected behavior, I don't get
what is the problem here.


Best regards,
Krzysztof