On 04/23/2013 05:44 AM, Vinod Koul :
> On Mon, Apr 22, 2013 at 12:22:32PM +0200, Nicolas Ferre wrote:
>> On 04/19/2013 11:11 AM, ludovic.desroches@xxxxxxxxx :
>>> From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
>
>>> +#ifdef CONFIG_OF
>>> +static bool at_dma_filter(struct dma_chan *chan, void *slave)
> this is not defined for else case here. Also this could be CONFIG_DMA_OF...?
in fact, at_dma_filter() is only used in corresponding
dma_request_channel() in at_dma_xlate() function just below and only in
case of CONFIG_OF.
As the at_dma_xlate() is an empty function in !CONFIG_OF case, the
at_dma_filter() is not needed.
For the use of CONFIG_OF and not CONFIG_OF_DMA, it is simply because it
it the directive that we currently use in drivers when we have to put
the device tree condition around a piece of code. It is quite a common
pattern I think.
Moreover, it is what is used in dw_dmac.c and mv_xor.c...
>>> +{
>>> + struct at_dma_slave *atslave = slave;
>>> +
>>> + if (atslave->dma_dev == chan->device->dev) {
>>> + chan->private = atslave;
>>> + return true;
>>> + } else {
>>> + return false;
>>> + }
>>> +}
>
> --
> ~Vinod
Best regards,
--
Nicolas Ferre
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