dmaengine: Couple DMA channels to their physical DMA device

Set the 'parent' field of channel class devices to point to the
physical DMA device initialized by the DMA engine driver.

This allows drivers to use chan->dev.parent for syncing DMA buffers
and adds a 'device' symlink to the real device in
/sys/class/dma/dmaXchanY.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 97b329e767983172a7069687d4d8fedb1e28cee7..99c22b42bada79dbbd834bf09156e00f3fef81ff 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -378,7 +378,7 @@ int dma_async_device_register(struct dma_device *device)
 
                chan->chan_id = chancnt++;
                chan->dev.class = &dma_devclass;
-               chan->dev.parent = NULL;
+               chan->dev.parent = device->dev;
                snprintf(chan->dev.bus_id, BUS_ID_SIZE, "dma%dchan%d",
                         device->dev_id, chan->chan_id);