On Thu, Jun 04, 2015 at 06:58:06PM +0300, Peter Ujfalusi wrote: > Vinod, > > On 06/02/2015 03:55 PM, Vinod Koul wrote: > > On Fri, May 29, 2015 at 05:32:50PM +0300, Peter Ujfalusi wrote: > >> On 05/29/2015 01:18 PM, Vinod Koul wrote: > >>> On Fri, May 29, 2015 at 11:42:27AM +0200, Geert Uytterhoeven wrote: > >>>> On Fri, May 29, 2015 at 11:33 AM, Vinod Koul <vinod.koul@xxxxxxxxx> wrote: > >>>>> On Tue, May 26, 2015 at 04:25:57PM +0300, Peter Ujfalusi wrote: > >>>>>> dma_request_slave_channel_compat() 'eats' up the returned error codes which > >>>>>> prevents drivers using the compat call to be able to do deferred probing. > >>>>>> > >>>>>> The new wrapper is identical in functionality but it will return with error > >>>>>> code in case of failure and will pass the -EPROBE_DEFER to the caller in > >>>>>> case dma_request_slave_channel_reason() returned with it. > >>>>> This is okay but am worried about one more warpper, how about fixing > >>>>> dma_request_slave_channel_compat() > >>>> > >>>> Then all callers of dma_request_slave_channel_compat() have to be > >>>> modified to handle ERR_PTR first. > >>>> > >>>> The same is true for (the existing) dma_request_slave_channel_reason() > >>>> vs. dma_request_slave_channel(). > >>> Good point, looking again, I think we should rather fix > >>> dma_request_slave_channel_reason() as it was expected to return err code and > >>> add new users. Anyway users of this API do expect the reason... > >> > >> Hrm, they are for different use.dma_request_slave_channel()/_reason() is for > >> drivers only working via DT or ACPI while > >> dma_request_slave_channel_compat()/_reason() is for drivers expected to run in > >> DT/ACPI or legacy mode as well. > >> > >> I added the dma_request_slave_channel_compat_reason() because OMAP/daVinci > >> drivers are using this to request channels - they need to support DT and > >> legacy mode. > > I think we should hide these things behind the API and do this behind the > > hood for ACPI/DT systems. > > > > Also it makes sense to use right API and mark rest as depricated > > So to convert the dma_request_slave_channel_compat() and not to create _reason > variant? > > Or to have single API to request channel? The problem with that is that we > need different parameters for legacy and DT for example. Sorry this slipped thru Thinking about it again, I think we should coverge to two APIs and mark the legacy depracuated and look to convert folks and phase that out -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
