[PATCH 2/3] ARM: edma: Rename header file for dmaengine filter function definition
arnd at arndb.de
Thu Nov 27 06:50:46 PST 2014
On Thursday 27 November 2014 16:23:31 Peter Ujfalusi wrote:
> This will only work in case of legacy boot. When booting with DT we do not
> have pdata and after this patch in dt boot we are not going to be able to get
> the DMA resources either.
No, when booting with DT, the filter_fn and data are not used at all,
we get the dma channel by parsing the DT instead.
> I think if we want to do something like this, it has to be done within the
> dmaengine framework. The dma controller's of_dma_filter_info already have
> .filter_fn which could be used by the framework.
No, of_dma_filter_info/of_dma_simple_xlate was a mistake, we should never
have even introduced that. All drivers that rely on this can simply
provide their own xlate function that calls of_dma_get_slave_channel()
or one of the related functions.
edma is particularly trivial, it can just use of_dma_xlate_by_chan_id()
instead of of_dma_simple_xlate, as it looks up the channel by its number.
More information about the linux-arm-kernel