linux-kernel - [PATCH v7 0/3] PCI: imx6: Add external reference clock mode support

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Message-Id: <20250918032555.3987157-1-hongxing.zhu@nxp.com>
Date: Thu, 18 Sep 2025 11:25:52 +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,
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	conor+dt@...nel.org,
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	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
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Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
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	linux-kernel@...r.kernel.org
Subject: [PATCH v7 0/3] PCI: imx6: Add external reference clock mode support

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 mode support for i.MX95 PCIes.

Main change in v7:
- Refine the subjects and commit message refer to Bjorn's comments.

Main change in v6:
- Refer to Krzysztof's comments, let i.MX95 PCIes has the "ref" clock
  since it is wired actually, and add one more optional "extref" clock
  for i.MX95 PCIes.
https://lore.kernel.org/imx/20250917045238.1048484-1-hongxing.zhu@nxp.com/

Main change in v5:
- Update the commit message of first patch refer to Bejorn's comments.
- Correct the typo error and update the description of property in the
  first patch.
https://lore.kernel.org/imx/20250915035348.3252353-1-hongxing.zhu@nxp.com/

Main change in v4:
- Add one more reference clock "extref" to be onhalf the reference clock
  that comes from external crystal oscillator.
https://lore.kernel.org/imx/20250626073804.3113757-1-hongxing.zhu@nxp.com/

Main change in v3:
- Update the logic check external reference clock mode is enabled or
  not in the driver codes.
https://lore.kernel.org/imx/20250620031350.674442-1-hongxing.zhu@nxp.com/

Main change in v2:
- Fix yamllint warning.
- Refine the driver codes.
https://lore.kernel.org/imx/20250619091004.338419-1-hongxing.zhu@nxp.com/

[PATCH v7 1/3] dt-bindings: PCI: dwc: Add external reference clock
[PATCH v7 2/3] dt-bindings: PCI: pci-imx6: Add external reference
[PATCH v7 3/3] PCI: imx6: Add external reference clock input mode

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml      |  3 +++
Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml |  6 ++++++
drivers/pci/controller/dwc/pci-imx6.c                          | 20 +++++++++++++-------
3 files changed, 22 insertions(+), 7 deletions(-)