linux-kernel - [PATCH v7 2/3] dt-bindings: PCI: pci-imx6: Add external reference clock input

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Message-Id: <20250918032555.3987157-3-hongxing.zhu@nxp.com>
Date: Thu, 18 Sep 2025 11:25:54 +0800
From: Richard Zhu <hongxing.zhu@....com>
To: frank.li@....com,
	l.stach@...gutronix.de,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	bhelgaas@...gle.com,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com
Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Richard Zhu <hongxing.zhu@....com>,
	Frank Li <Frank.Li@....com>
Subject: [PATCH v7 2/3] dt-bindings: PCI: pci-imx6: Add external reference clock input

i.MX95 PCIes have two reference clock inputs: one from internal PLL, the
other from off chip crystal oscillator. The "extref" clock refers to a
reference clock from an external crystal oscillator.

Add external reference clock input for i.MX95 PCIes.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
Reviewed-by: Frank Li <Frank.Li@....com>
---
 Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
index ca5f2970f217..b4c40d0573dc 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
@@ -212,14 +212,17 @@ allOf:
     then:
       properties:
         clocks:
+          minItems: 4
           maxItems: 5
         clock-names:
+          minItems: 4
           items:
             - const: pcie
             - const: pcie_bus
             - const: pcie_phy
             - const: pcie_aux
             - const: ref
+            - const: extref  # Optional
 
 unevaluatedProperties: false
 
-- 
2.37.1