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Furthermore, permit to specify a >>>>>> restricted DMA pool by phandle. >>>>> >>>>> That's an ABI break without explanation why it is necessary. >>>>> >>>> >>>> It is needed in order to support the PVU, as written above. >>> >>> Above say only that you want a new feature and that's not really >>> suitable explanation for ABI break, because answer to this is: add new >>> feature without breaking existing users. But maybe there is a bug or >>> something does not work or never work or there are no users, don't know. >>> >>>> >>>> Previous versions of this binding likely didn't consider this use case >>>> and therefore didn't describe all registers associated with the hardware. >>>> >>>> BTW, if you see a way to add the required registers without breaking >>>> more than needed, I'm all ears. At least the kernel driver will continue >>>> to work with older DTs when you disable PVU support or do not add a DMA >>>> pool to the DT. >>> >>> If there is no ABI break, because driver still handles correctly old >>> DTB, then mention it in the commit msg. >> >> Well, this is strictly spoken not a topic for this commit because this >> one should have no clue about what drivers do with DTs according to this >> binding. But I can put a hint and go into details in the driver patch. > > Based on the Techincal Reference Manual for AM654 and the driver > implementation in patch 5/6, I think that the following might be one way > of hinting that ABI won't break: > > 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 > configured whenever PVU is used for PCIe. Thanks, will reuse this! Additionally, we should then likely do reg: minItems: 4 maxItems: 6 to underline that the old form is still fine. Do I need to do anything to reg-names then as well? Jan -- Siemens AG, Technology Linux Expert Center