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Add support for resetting the Root Port for i.MX PCIe to enable link recovery. [1] https://patchwork.kernel.org/project/linux-pci/cover/20260310-pci-port-reset-v7-0-9dd00ccc25ab@oss.qualcomm.com/ PCIe links can go down due to various unexpected circumstances. This patch series adds root port reset support for link recovery on i.MX PCIe controllers when the optional "intr" interrupt is present. When a link down event is detected, the root port reset uninitializes and reinitializes the PCIe controller, then restarts the PCIe link. On i.MX95 platforms, link events and PME share the same interrupt line. Link event interrupts cannot use only an IRQ thread handler because the PME driver uses request_irq() to bind the PME interrupt directly with only the IRQF_SHARED flag set. To address this, we register one handler with IRQF_SHARED for link event interrupts and manipulate the enable bits of link events to ensure the same interrupt source is triggered only once at a time. Additionally, this series adds 'intr', 'aer', and 'pme' interrupt entries to the i.MX6Q PCIe binding to support PCIe event-based interrupts for general controller events, Advanced Error Reporting, and Power Management Events respectively. [PATCH v1 1/3] dt-bindings: PCI: imx6q-pcie: Add intr, aer and pme [PATCH v1 2/3] arm64: dts: imx95: Add dma, intr, aer and pme [PATCH v1 3/3] PCI: imx6: Add root port reset to support link Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 6 +++++ arch/arm64/boot/dts/freescale/imx95.dtsi | 16 +++++++++--- drivers/pci/controller/dwc/pci-imx6.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 140 insertions(+), 4 deletions(-)