Re: [EXTERNAL] Re: [PATCH] arm64: defconfig: enable PCIe controller on TI platforms

["Verma, Achal" <a-verma1@ti.com>]

Hello,
On 5/9/2023 1:58 PM, Arnd Bergmann wrote:
> On Tue, May 9, 2023, at 10:08, Vignesh Raghavendra wrote:
> 
>> Also, see [0] for history. We really want these to be
>> modules unless its necessary for bootup.
>>
>> You may want to revive [1] and get it to mainline
>>
>> [0]
>> https://lore.kernel.org/linux-arm-kernel/CAK8P3a2VSBvOn1o+q1PYZaQ6LS9U4cz+DZGuDbisHkwNs2dAAw@mail.gmail.com/
>> [1]
>> https://lore.kernel.org/linux-arm-kernel/20230110153805.GA1505901@bhelgaas/
> 
> Agreed, that seems simple enough. Ideally these should even
> be removable modules, not just single-load but unremovable.
> 
> Doing that may require changes to the cadence PCIe host
> code if that does not support unloading yet (I have not
> checked), but should not require any changes to the core
> PCIe host code that supports loadable/removable modules.
> 
>       Arnd
So, my understanding is that following change is expected
+CONFIG_PCIE_CADENCE=m
+CONFIG_PCIE_CADENCE_HOST=m
+CONFIG_PCIE_CADENCE_EP=m
+CONFIG_PCI_J721E=m
+CONFIG_PCI_J721E_HOST=m
+CONFIG_PCI_J721E_EP=m
+CONFIG_PCI_EPF_NTB=m

I also want to inform that pci_j721e.c is a single file with both host 
and EP functionality, last attempt to build it as modules depending on 
host or EP selected failed because of symbols dependency.
Refactoring of pci_j721e.c into common, host and EP specific files could 
work similar to the Cadence driver, So I will follow this way and push 
the changes.

Please let me know if there are concerns.


Thanks,
Achal Verma