| Date | Tue, 9 Feb 2021 15:33:20 -0600 | From | Rob Herring <> | Subject | Re: [PATCH v4 4/8] of: property: Add fw_devlink support for optional properties |
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On Fri, Feb 05, 2021 at 02:26:40PM -0800, Saravana Kannan wrote: > Not all DT bindings are mandatory bindings. Add support for optional DT > bindings and mark iommus, iommu-map, dmas as optional DT bindings.
I don't think we can say these are optional or not. It's got to be a driver decision somehow.
For example, if IOMMU is optional, what happens with this sequence:
driver probes without IOMMU driver calls dma_map_?() IOMMU driver probes h/w accesses DMA buffer --> BOOM!
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