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

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Date: Wed, 19 Jun 2024 13:24:05 +0200
From: Matthias Schiffer <matthias.schiffer@...tq-group.com>
To: 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>
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux@...tq-group.com,
	Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH 1/2] dt-bindings: soc: ti: pruss: allow ethernet controller in ICSSG node

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:

- It makes sense semantically - the Ethernet controller is running on
  the ICSSG/PRUSS
- Disabling or deleting the ICSSG node implicitly removes the Ethernet
  controller node when it is a child node. This can be relevant on SoCs
  like the AM64x which come in variants with and without ICSSG; e.g., on
  the TQMa64xxL the ICSSG node will be disabled on variants without as a
  bootloader fixup.
  On Linux, this avoids leaving the Ethernet controller in deferred
  state forever while waiting for the ICSSG to become available
  (resulting in a warning on newer kernels)

The node name "ethernet" is chosen as it nicely matches the regular
"ethernet@<reg>" format of many Ethernet controller nodes, and is also
what the prueth binding example (/schemas/net/ti,icssg-prueth.yaml) uses.

Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
 Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml b/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
index c402cb2928e89..89dfcf5ce8434 100644
--- a/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
+++ b/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
@@ -92,6 +92,13 @@ properties:
     description: |
       This property is as per sci-pm-domain.txt.
 
+  ethernet:
+    description: |
+      ICSSG PRUSS Ethernet. Configuration for an Ethernet controller running
+      on the PRU-ICSS.
+    $ref: /schemas/net/ti,icssg-prueth.yaml#
+    type: object
+
 patternProperties:
 
   memories@[a-f0-9]+$:
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