On 2025/7/14 15:43, Krzysztof Kozlowski wrote:
EXTERNAL EMAIL
On 03/07/2025 03:47, Hans Zhang wrote:
We initially used the logic of Cadence common driver as follows:
drivers/pci/controller/cadence/pcie-cadence-host.c
of_property_read_u32(np, "vendor-id", &rc->vendor_id);
of_property_read_u32(np, "device-id", &rc->device_id);
So, can the code in Cadence be deleted?
Don't know. If this is ABI, then not.
According to my understanding, this is not ABI.
Huh? Then what is ABI, by your understanding?
Dear Krzysztof,
I understand kernel ABI primarily refers to the stable binary contract
between the kernel and userspace (e.g., syscalls, /sys/proc interfaces).
Device tree properties are part of the boot-time hardware description
consumed by drivers during initialization. They are not directly exposed
to userspace as ABI interfaces.
If I understand wrongly, please correct me.
It was about half a year ago when I submitted the patch that could view
LTSSM link status in dwc that I learned about the ABI. There are not
many studies on this.
https://lore.kernel.org/linux-pci/20250123164944.GA1223935@bhelgaas/
Best regards,
Hans
