Re: [Linaro-acpi] [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object

On Tuesday 05 May 2015 10:12:06 Suravee Suthikulpanit wrote:

+struct dma_map_ops dummy_dma_ops = {

•   .alloc                  = __dummy_alloc,
  

•   .free                   = __dummy_free,
  

•   .mmap                   = __dummy_mmap,
  

•   .map_page               = __dummy_map_page,
  

•   .unmap_page             = __dummy_unmap_page,
  

•   .map_sg                 = __dummy_map_sg,
  

•   .unmap_sg               = __dummy_unmap_sg,
  

•   .sync_single_for_cpu    = __dummy_sync_single_for_cpu,
  

•   .sync_single_for_device = __dummy_sync_single_for_device,
  

•   .sync_sg_for_cpu        = __dummy_sync_sg_for_cpu,
  

•   .sync_sg_for_device     = __dummy_sync_sg_for_device,
  

•   .mapping_error          = __dummy_mapping_error,
  

•   .dma_supported          = __dummy_dma_supported,
  

+}; +EXPORT_SYMBOL(dummy_dma_ops);

This will clearly work, but I think it's easier to just leave the dma_mask pointer as NULL when creating the platform device, which should let the normal dma ops fail all the callbacks.

Arnd