linux-kernel - Re: [RFC v02 04/15] dmaengine: edma: Add support for DMA filter mapping to slave devices

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Date:	Mon, 30 Nov 2015 15:11:49 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	vinod.koul@...el.com, andy.shevchenko@...il.com,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mmc@...r.kernel.org, nsekhar@...com,
	linux-spi@...r.kernel.org
Subject: Re: [RFC v02 04/15] dmaengine: edma: Add support for DMA filter mapping to slave devices

On Monday 30 November 2015 15:45:34 Peter Ujfalusi wrote:
> @@ -2428,6 +2436,22 @@ bool edma_filter_fn(struct dma_chan *chan, void *param)
>  }
>  EXPORT_SYMBOL(edma_filter_fn);
>  
> +static bool edma_filter_for_map(struct dma_chan *chan, void *param)
> +{
> +       bool match = false;
> +
> +       if (chan->device->dev->driver == &edma_driver.driver) {
> +               struct edma_chan *echan = to_edma_chan(chan);
> +               unsigned ch_req = (unsigned)param;
> +               if (ch_req == echan->ch_num) {
> +                       /* The channel is going to be used as HW synchronized */
> +                       echan->hw_triggered = true;
> +                       match = true;
> +               }
> +       }
> +       return match;
> +}
> +
>  static int edma_init(void)
> 

I don't see the difference between edma_filter_fn and edma_filter_for_map.
Why do you need both?

	Arnd
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