* Matt Porter <mporter@xxxxxx> [120920 07:43]:
> For platforms with DT populated, use dma_request_slave_channel()
> to acquire the DMA channel. For !DT platforms, we fall back to
> explicitly passing the omap_dma_filter_fn() to dma_request_channel().
> Once all platforms boot from DT, the dma_request_channel() path can
> be dropped.
>
> Signed-off-by: Matt Porter <mporter@xxxxxx>
> ---
> drivers/mmc/host/omap_hsmmc.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 3a09f93..c82d0ab 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -1923,14 +1923,26 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
> dma_cap_zero(mask);
> dma_cap_set(DMA_SLAVE, mask);
>
> - host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
> + if (pdev->dev.of_node)
> + host->rx_chan =
> + dma_request_slave_channel(&pdev->dev, "rx");
> + else
> + host->rx_chan = dma_request_channel(mask,
> + omap_dma_filter_fn,
> + &rx_req);
> if (!host->rx_chan) {
> dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
> ret = -ENXIO;
> goto err_irq;
> }
>
> - host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
> + if (pdev->dev.of_node)
> + host->tx_chan =
> + dma_request_slave_channel(&pdev->dev, "tx");
> + else
> + host->tx_chan = dma_request_channel(mask,
> + omap_dma_filter_fn,
> + &tx_req);
> if (!host->tx_chan) {
> dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
> ret = -ENXIO;
>
Here to the omap_hsmmc.c driver should not need to care about which
way to request the dma channels.
Regards,
Tony
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