linux-kernel - [RFC v3 1/7] dmaengine: Couple DMA channels to their physical DMA device

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Message-Id: <1202834638-9009-1-git-send-email-hskinnemoen@atmel.com>
Date:	Tue, 12 Feb 2008 17:43:52 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>
Cc:	Shannon Nelson <shannon.nelson@...el.com>,
	David Brownell <david-b@...bell.net>, kernel@...32linux.org,
	"Francis Moreau" <francis.moro@...il.com>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Vladimir A. Barinov" <vbarinov@...mvista.com>,
	Pierre Ossman <drzeus-list@...eus.cx>,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [RFC v3 1/7] 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@...el.com>
---
 drivers/dma/dmaengine.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 2996523..7c7cb4b 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -379,7 +379,7 @@ 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);
 
-- 
1.5.3.8

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