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dt-bindings: PCI: pci-imx6: Add external reference clock input

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i.MX95 PCIes have two reference clock inputs: one from internal PLL.
It's wired inside chip and present as "ref" clock. It's not an optional
clock. The other from off chip crystal oscillator. The "extref" clock
refers to a reference clock from an external crystal oscillator through
the CLKIN_N/P pair PADs. It is an optional clock, relied on the board
design.

Add additional optional external reference clock input for i.MX95 PCIes.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251211064821.2707001-3-hongxing.zhu@nxp.com
This commit is contained in:
Richard Zhu 2025-12-11 14:48:19 +08:00 committed by Manivannan Sadhasivam
parent 4189709830
commit 1352f58d7c
1 changed files with 5 additions and 2 deletions
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7
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
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@ -44,7 +44,7 @@ properties:
clock-names: clock-names:
minItems: 3 minItems: 3
maxItems: 5 maxItems: 6
interrupts: interrupts:
minItems: 1 minItems: 1
@ -212,14 +212,17 @@ allOf:
then: then:
properties: properties:
clocks: clocks:
maxItems: 5 minItems: 5
maxItems: 6
clock-names: clock-names:
minItems: 5
items: items:
- const: pcie - const: pcie
- const: pcie_bus - const: pcie_bus
- const: pcie_phy - const: pcie_phy
- const: pcie_aux - const: pcie_aux
- const: ref - const: ref
- const: extref # Optional
unevaluatedProperties: false unevaluatedProperties: false