From: Zhangfei Gao <zhangfei.gao@linaro.org>
Date: Fri, 28 Jun 2013 12:39:12 +0000 (+0800)
Subject: dmaengine: add interface of dma_get_slave_channel
X-Git-Tag: v3.12-rc1~68^2~52^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bb587f4eef8f71ce589f360ab99bb54ab0fc85d;p=pandora-kernel.git

dmaengine: add interface of dma_get_slave_channel

Suggested by Arnd, add dma_get_slave_channel interface
Dma host driver could get specific channel specificied by request line, rather than filter.

host example:
static struct dma_chan *xx_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
		struct of_dma *ofdma)
{
	struct xx_dma_dev *d = ofdma->of_dma_data;
	unsigned int request = dma_spec->args[0];

	if (request > d->dma_requests)
		return NULL;

	return dma_get_slave_channel(&(d->chans[request].vc.chan));
}

probe:
of_dma_controller_register((&op->dev)->of_node, xx_of_dma_simple_xlate, d);

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---

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