linux-kernel - Re: [PATCH v13] dmaengine: Add MOXA ART DMA engine driver

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Date:	Wed, 11 Dec 2013 22:27:18 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dotorg.org>
Cc:	Jonas Jensen <jonas.jensen@...il.com>, dmaengine@...r.kernel.org,
	mark.rutland@....com, lars@...afoo.de, linux@....linux.org.uk,
	vinod.koul@...el.com, linux-kernel@...r.kernel.org, arm@...nel.org,
	djbw@...com, andriy.shevchenko@...ux.intel.com
Subject: Re: [PATCH v13] dmaengine: Add MOXA ART DMA engine driver

I didn't comment on this earlier since you had already gone through 12 revisions
and I didn't want to hold up merging any longer. This can be done as a follow-up,
or you can include it if you end up doing a v14:

On Wednesday 11 December 2013, Jonas Jensen wrote:

> +bool moxart_dma_filter_fn(struct dma_chan *chan, void *param)
> +{
> +       struct moxart_filter_data *fdata = param;
> +       struct moxart_chan *ch = to_moxart_dma_chan(chan);
> +
> +       if (chan->device->dev != fdata->mdc->dma_slave.dev ||
> +           chan->device->dev->of_node != fdata->dma_spec->np) {
> +               dev_dbg(chan2dev(chan), "device not registered to this DMA engine\n");
> +               return false;
> +       }
> +
> +       dev_dbg(chan2dev(chan), "%s: ch=%p line_reqno=%u ch->ch_num=%u\n",
> +               __func__, ch, fdata->dma_spec->args[0], ch->ch_num);
> +
> +       ch->line_reqno = fdata->dma_spec->args[0];
> +
> +       return true;
> +}
> +
> +static struct dma_chan *moxart_of_xlate(struct of_phandle_args *dma_spec,
> +                                       struct of_dma *ofdma)
> +{
> +       struct moxart_dmadev *mdc = ofdma->of_dma_data;
> +       struct moxart_filter_data fdata = {
> +               .mdc = mdc,
> +       };
> +
> +       if (dma_spec->args_count < 1)
> +               return NULL;
> +
> +       fdata.dma_spec = dma_spec;
> +
> +       return dma_request_channel(mdc->dma_slave.cap_mask,
> +                                  moxart_dma_filter_fn, &fdata);
> +}

The moxart_dma_filter_fn should get removed and the moxart_of_xlate() rewritten
based on Stephen Warren's dma_get_any_slave_channel() interface once that
is available in the dmaengine git tree.

	Arnd
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