linux-kernel - [PATCH v4 1/3] dt-bindings: PCI: dwc: Add one more reference clock

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Message-Id: <20250626073804.3113757-2-hongxing.zhu@nxp.com>
Date: Thu, 26 Jun 2025 15:38:02 +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>
Subject: [PATCH v4 1/3] dt-bindings: PCI: dwc: Add one more reference clock

Add one more reference clock "extref" to be onhalf the reference clock
that comes from external crystal oscillator.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 .../devicetree/bindings/pci/snps,dw-pcie-common.yaml        | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
index 34594972d8db..ee09e0d3bbab 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
@@ -105,6 +105,12 @@ properties:
             define it with this name (for instance pipe, core and aux can
             be connected to a single source of the periodic signal).
           const: ref
+        - description:
+            Some dwc wrappers (like i.MX95 PCIes) have two reference clock
+            inputs, one from internal PLL, the other from off chip crystal
+            oscillator. Use extref clock name to be onhalf of the reference
+            clock comes form external crystal oscillator.
+          const: extref
         - description:
             Clock for the PHY registers interface. Originally this is
             a PHY-viewport-based interface, but some platform may have
-- 
2.37.1