Re: [PATCH v4 2/7] dt-bindings: PCI: ti,am65: Extend for use with PVU
From: Siddharth Vadapalli
Date: Wed Sep 04 2024 - 06:17:19 EST
On Wed, Sep 04, 2024 at 12:00:11PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>
> The PVU on the AM65 SoC is capable of restricting DMA from PCIe devices
> to specific regions of host memory. Add the optional property
> "memory-regions" to point to such regions of memory when PVU is used.
>
> Since the PVU deals with system physical addresses, utilizing the PVU
> with PCIe devices also requires setting up the VMAP registers to map the
> Requester ID of the PCIe device to the CBA Virtual ID, which in turn is
> mapped to the system physical address. Hence, describe the VMAP
> registers which are optionally unless the PVU shall used for PCIe.
The last line above seems to be accidentally modified when compared to
the one at:
https://lore.kernel.org/r/ada462d5-157a-4e11-ba25-d412a2bb678f@xxxxxx/
"Hence, describe the VMAP registers which are optionally
configured whenever PVU is used for PCIe."
If you intended to modify it, then the sentence appears distorted.
Regards,
Siddharth.