Re: [PATCH 7/9] spi: s3c64xx: Use dma_request_chan() directly for channel request

[Peter Ujfalusi <peter.ujfalusi@xxxxxx>]

On 14/11/2019 1.40, Andi Shyti wrote:
> Hi Peter,
> 
>>  	if (!is_polling(sdd)) {
>>  		/* Acquire DMA channels */
>> -		sdd->rx_dma.ch = dma_request_slave_channel_reason(&pdev->dev,
>> -								  "rx");
>> +		sdd->rx_dma.ch = dma_request_chan(&pdev->dev, "rx");
> 
> I have a little concern here. We have two funcions
> 'dma_request_chan' and  'dma_request_channel' don't we end up
> making some confusion here?
> 
> Wouldn't it make more sense renaming 'dma_request_chan' to
> 'dma_request_slave_channel_reason'?

The dma_request_channel() should go away. It was the old API before we
got the dma_slave_map for non DT (and non ACPI) platforms so we can get
rid of the filter function exports from DMA drivers to clients all over
the place.

I know there are users where they provide dummy filter function.

At the end the main API to request slave DMA channel should be
dma_request_chan()
For non slave channels (not HW triggered) we have dma_request_chan_by_mask()

Imoh the dma_request_slave_channel_compat() should also go away with time.

> 
> Thanks,
> Andi
> 
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- Péter

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