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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. >>>>>>> >>>>>>> Signed-off-by: Jan Kiszka >>>>>>> --- >>>>>>> CC: Lorenzo Pieralisi >>>>>>> CC: "Krzysztof Wilczyński" >>>>>>> CC: Bjorn Helgaas >>>>>>> CC: linux-pci@vger.kernel.org >>>>>>> --- >>>>>>> .../bindings/pci/ti,am65-pci-host.yaml | 52 ++++++++++++++----- >>>>>>> 1 file changed, 40 insertions(+), 12 deletions(-) >>>>>>> >>>>>>> diff --git a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>>>>>> index 0a9d10532cc8..d8182bad92de 100644 >>>>>>> --- a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>>>>>> +++ b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>>>>>> @@ -19,16 +19,6 @@ properties: >>>>>>> - ti,am654-pcie-rc >>>>>>> - ti,keystone-pcie >>>>>>> >>>>>>> - reg: >>>>>>> - maxItems: 4 >>>>>>> - >>>>>>> - reg-names: >>>>>>> - items: >>>>>>> - - const: app >>>>>>> - - const: dbics >>>>>>> - - const: config >>>>>>> - - const: atu >>>>>> >>>>>> >>>>>> Nothing improved here. >>>>> >>>>> Yes, explained the background to you. Sorry, if you do not address my >>>>> replies, I'm lost with your feedback. >>>> >>>> My magic ball could not figure out the problem, so did not provide the >>>> answer. >>>> >>>> I gave you the exact code which illustrates how to do it. If you do it >>>> that way: it works. If you do it other way: it might not work. However >>> >>> The link you provided was unfortunately not self-explanatory because if >>> I - apparently - do it like that example, I'm getting the errors below. >>> >>>> without seeing anything, magic ball was silent, so I am not >>>> participating in game: would you be so kind to give more information so >>>> I won't waste my day in asking what is wrong. >>> >>> With my patch: >>> >>> # make ... dtbs_check >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-pg2.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2.dtb >>> OVL [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-ekey-pcie.dtb >>> OVL [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-usb3.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-pg2.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-sm.dtb >>> DTC [C] arch/arm64/boot/dts/ti/k3-am654-base-board.dtb >>> >>> With this revert on top: >>> >>> diff --git a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>> index d8182bad92de..dd753dae24c6 100644 >>> --- a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>> +++ b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml >>> @@ -19,6 +19,16 @@ properties: >>> - ti,am654-pcie-rc >>> - ti,keystone-pcie >>> >>> + reg: >>> + maxItems: 4 >>> + >>> + reg-names: >>> + items: >>> + - const: app >>> + - const: dbics >>> + - const: config >>> + - const: atu >> >> There is nothing like that in that example. >> https://elixir.bootlin.com/linux/v6.8/source/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml#L44 >> >>> + >>> interrupts: >>> maxItems: 1 >>> >>> @@ -104,18 +114,6 @@ then: >>> - msi-map >>> - num-viewport >>> >>> -else: >>> - properties: >>> - reg: >>> - maxItems: 4 >>> - >>> - reg-names: >>> - items: >>> - - const: app >>> - - const: dbics >>> - - const: config >>> - - const: atu >> >> Neither this. >> >> Each case MUST be covered, look: >> https://elixir.bootlin.com/linux/v6.8/source/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml#L191 > > Actually your case fits better another example from UFS, so take that one: > > https://elixir.bootlin.com/linux/v6.11-rc6/source/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml#L39 > Via lots of trial-and-error, I think I now understood the magic behind this: You may reduce maxItems in a condition, but you cannot increase it. That's why all my intuition-based attempts failed before. Not sure if this is a specified property of the meta schema or just an oddity of the validator. Jan -- Siemens AG, Technology Linux Expert Center