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Unless and until accelerator (type-2) drivers start registering for CXL.mem mapping services from the CXL subsystem core, initialize idle HDM decoders to the "expander" type. I.e. the only CXL devices using the CXL core presently are those implementing the CXL 2.0 Type-3 memory expander device class code that the cxl_pci driver claims. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/20220624041950.559155-6-dan.j.williams@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>