On Wednesday, March 25, 2015 at 03:40:28 PM, Stephen Warren wrote:
On 03/25/2015 05:55 AM, Marek Vasut wrote:
On Wednesday, March 25, 2015 at 03:07:33 AM, Stephen Warren wrote:
On some SoCs, DMA-capable peripherals see a different address space to the CPU's physical address space. Create an API to allow platform-agnostic drivers to convert between the two address spaces when programming DMA operations.
This API will exist on all platforms, but will have a dummy implementation when this feature is not required. Other platforms will enable CONFIG_PHYS_TO_BUS and provide the required implementation.
Signed-off-by: Stephen Warren swarren@wwwdotorg.org
Applied to -next, thanks!
btw. can't you use __weak here instead of a new ifdef macro (which is not documented btw)?
__weak wont' work with inlines, which I used to ensure zero code overhead in the case the functions aren't needed. If we were OK with calling a no-op function in all cases, we could indeed provide a weak default implementation and get rid of the ifdef.
OK, makes sense.
The new option is documented in the Kconfig file. I assume we don't need to document options in multiple places (both Kconfig and README), since if we do, the documentation is bound to become inconsistent in those two places. Hopefully README goes away once everything is in Kconfig.
Yup, agreed.
Thanks for clearing this up :)
Best regards, Marek Vasut