Hello, This series enables support to build the PCIe Cadence Controller drivers and the PCI J721E Application/Wrapper/Glue driver as Loadable Kernel Modules. The motivation for this series is that PCIe is not a necessity for booting the SoC, due to which it doesn't have to be a built-in module. Additionally, the defconfig doesn't enable the PCIe Cadence Controller drivers and the PCI J721E driver, due to which PCIe is not supported by default. Enabling the configs as of now (i.e. without this series) will result in built-in drivers i.e. a bloated Linux Image for everyone who doesn't have the PCIe Controller. Therefore, with this series, after enabling support for building the drivers as loadable modules, the driver configs can be enabled in the defconfig to build the drivers as loadable modules, thereby enabling PCIe. Series is based on linux-next tagged next-20250306. -------------------------- Series has been tested for -------------------------- [1] Loading and Unloading the PCI J721E driver when operating in the Root-Complex mode on J721E-EVM with an NVMe SSD connected to the PCIe Connector. "hdparm" based reads of the NVMe SSD have been performed to validated functionality before and after a module unload-load sequence using modprobe. Logs: https://gist.github.com/Siddharth-Vadapalli-at-TI/085fd24d416bab5dc7d798156ce130b3 [2] Loading and Unloading the PCI J721E driver when operating in the Endpoint mode on J784S4-EVM with 6 Physical Functions configured in the Endpoint and connected to the J721E-EVM as the Root-Complex. Logs: https://gist.github.com/Siddharth-Vadapalli-at-TI/1ec568a76bc3ebc1082d434aab4ab00b The following changes to arch/arm64/configs/defconfig were made to test this series and will be posted as a patch after this series gets merged: diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 3a3706db2982..0ca073141c3e 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -209,6 +209,12 @@ CONFIG_NFC=m CONFIG_NFC_NCI=m CONFIG_NFC_S3FWRN5_I2C=m CONFIG_PCI=y +CONFIG_PCI_J721E=m +CONFIG_PCI_J721E_HOST=m +CONFIG_PCI_J721E_EP=m +CONFIG_PCIE_CADENCE=m +CONFIG_PCIE_CADENCE_HOST=m +CONFIG_PCIE_CADENCE_EP=m CONFIG_PCIEPORTBUS=y CONFIG_PCIEAER=y CONFIG_PCI_IOV=y Regards, Siddharth. Kishon Vijay Abraham I (1): PCI: cadence: Add support to build pcie-cadence library as a kernel module Siddharth Vadapalli (3): PCI: cadence-host: Introduce cdns_pcie_host_disable helper for cleanup PCI: cadence-ep: Introduce cdns_pcie_ep_disable helper for cleanup PCI: j721e: Add support to build as a loadable module drivers/pci/controller/cadence/Kconfig | 12 +- drivers/pci/controller/cadence/pci-j721e.c | 37 +++++- .../pci/controller/cadence/pcie-cadence-ep.c | 16 +++ .../controller/cadence/pcie-cadence-host.c | 113 ++++++++++++++++++ drivers/pci/controller/cadence/pcie-cadence.c | 12 ++ drivers/pci/controller/cadence/pcie-cadence.h | 14 ++- 6 files changed, 194 insertions(+), 10 deletions(-) -- 2.34.1
