linux-kernel - [PATCH 1/4] dt-bindings: misc: pci1de4,1: add required reg property for endpoint

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Message-ID: <b58bfcd957b2270fcf932d463f2db534b2ae1a6d.1766077285.git.andrea.porta@suse.com>
Date: Thu, 18 Dec 2025 20:09:06 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Andrea della Porta <andrea.porta@...e.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	iivanov@...e.de,
	svarbanov@...e.de,
	mbrugger@...e.com,
	Phil Elwell <phil@...pberrypi.com>
Subject: [PATCH 1/4] dt-bindings: misc: pci1de4,1: add required reg property for endpoint

The PCI subsystem links an endpoint Device Tree node to its corresponding
pci_dev structure only if the Bus/Device/Function (BDF) encoded in the
'reg' property matches the actual hardware topology.

Add the 'reg' property and mark it as required to ensure proper binding
between the device_node and the pci_dev.

Update the example to reflect this requirement.

Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 Documentation/devicetree/bindings/misc/pci1de4,1.yaml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/misc/pci1de4,1.yaml b/Documentation/devicetree/bindings/misc/pci1de4,1.yaml
index 2f9a7a554ed8a..17a8c19af8cc2 100644
--- a/Documentation/devicetree/bindings/misc/pci1de4,1.yaml
+++ b/Documentation/devicetree/bindings/misc/pci1de4,1.yaml
@@ -25,6 +25,10 @@ properties:
     items:
       - const: pci1de4,1
 
+  reg:
+    maxItems: 1
+    description: The PCI Bus-Device-Function address.
+
   '#interrupt-cells':
     const: 2
     description: |
@@ -101,6 +105,7 @@ unevaluatedProperties: false
 
 required:
   - compatible
+  - reg
   - '#interrupt-cells'
   - interrupt-controller
   - pci-ep-bus@1
@@ -111,8 +116,9 @@ examples:
         #address-cells = <3>;
         #size-cells = <2>;
 
-        rp1@0,0 {
+        dev@0,0 {
             compatible = "pci1de4,1";
+            reg = <0x10000 0x0 0x0 0x0 0x0>;
             ranges = <0x01 0x00 0x00000000  0x82010000 0x00 0x00  0x00 0x400000>;
             #address-cells = <3>;
             #size-cells = <2>;
-- 
2.35.3