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The plan is to add the wake-gpio property to the root port in subsequent patches. Also, the vpcie-supply property will be moved to the root port node later based on the refactoring patch set for the PCI pwrctrl framework[2]. The initial idea is to adopt the Manivannan’s recent PCIe M.2 KeyE connector support patch set[3] and PCI power control framework patches[2], and extend them to the pcie-imx6 driver. Since the new M.2/pwrctrl model is implemented based on Root Ports and requires the pwrctrl driver to bind to a Root Port device, we need to introduce a Root Port child node on i.MX boards that provide an M.2 connector. To follow a more standardized DT structure, it also makes sense to move the reset-gpios and wake-gpios properties into the Root Port node. These signals logically belong to the Root Port rather than the host bridge, and placing them there aligns with the new M.2/pwrctrl model. Regarding backward compatibility, as Frank suggested, I will not remove the old reset-gpio property from existing DTS files to avoid function break. For new i.MX platforms — such as the upcoming i.MX952-evk will add vpcie-supply, reset-gpios, and wake-gpios directly under the Root Port node. Therefore, driver updates are needed to support both the legacy properties and the new standardized Root Port based layout. [1] https://lore.kernel.org/linux-pci/20250702-perst-v5-0-920b3d1f6ee1@qti.qualcomm.com/ [2] https://lore.kernel.org/linux-pci/20260115-pci-pwrctrl-rework-v5-0-9d26da3ce903@oss.qualcomm.com/ [3] https://lore.kernel.org/linux-pci/20260112-pci-m2-e-v4-0-eff84d2c6d26@oss.qualcomm.com/ Signed-off-by: Sherry Sun --- Changes in V2: 1. Improve the patch#2 commit message as Frank suggested. 2. Add Reviewed-by tag for patch#1. Changes in V2: 1. Improve the patch#1 commit message as Frank suggested. 2. Also mark the reset-gpio-active-high property as deprecated in imx6q-pcie DT binding as Rob suggested. 3. The imx_pcie_delete_ports() has been moved up so that the imx_pcie_parse_ports() can call this helper function in error handling. 4. Keep the old reset-gpio property in the host bridge node for the existing dts files and add comments to avoid confusion. --- Sherry Sun (10): dt-bindings: PCI: fsl,imx6q-pcie: Add reset GPIO in Root Port node PCI: imx6: Add support for parsing the reset property in new Root Port binding arm: dts: imx6qdl: Add Root Port node and PERST property arm: dts: imx6sx: Add Root Port node and PERST property arm: dts: imx7d: Add Root Port node and PERST property arm64: dts: imx8mm: Add Root Port node and PERST property arm64: dts: imx8mp: Add Root Port node and PERST property arm64: dts: imx8mq: Add Root Port node and PERST property arm64: dts: imx8dxl/qm/qxp: Add Root Port node and PERST property arm64: dts: imx95: Add Root Port node and PERST property .../bindings/pci/fsl,imx6q-pcie.yaml | 32 +++++ .../arm/boot/dts/nxp/imx/imx6qdl-sabresd.dtsi | 5 + arch/arm/boot/dts/nxp/imx/imx6qdl.dtsi | 11 ++ .../arm/boot/dts/nxp/imx/imx6qp-sabreauto.dts | 5 + arch/arm/boot/dts/nxp/imx/imx6sx-sdb.dtsi | 5 + arch/arm/boot/dts/nxp/imx/imx6sx.dtsi | 11 ++ arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts | 5 + arch/arm/boot/dts/nxp/imx/imx7d.dtsi | 11 ++ .../boot/dts/freescale/imx8-ss-hsio.dtsi | 11 ++ arch/arm64/boot/dts/freescale/imx8dxl-evk.dts | 5 + arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 5 + arch/arm64/boot/dts/freescale/imx8mm.dtsi | 11 ++ arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 5 + arch/arm64/boot/dts/freescale/imx8mp.dtsi | 11 ++ arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 10 ++ arch/arm64/boot/dts/freescale/imx8mq.dtsi | 22 ++++ arch/arm64/boot/dts/freescale/imx8qm-mek.dts | 10 ++ .../boot/dts/freescale/imx8qm-ss-hsio.dtsi | 22 ++++ arch/arm64/boot/dts/freescale/imx8qxp-mek.dts | 5 + .../boot/dts/freescale/imx95-15x15-evk.dts | 5 + .../boot/dts/freescale/imx95-19x19-evk.dts | 10 ++ arch/arm64/boot/dts/freescale/imx95.dtsi | 22 ++++ drivers/pci/controller/dwc/pci-imx6.c | 123 ++++++++++++++++-- 23 files changed, 348 insertions(+), 14 deletions(-) -- 2.37.1