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Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver

Subject: Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver
From: Atsushi Nemoto <>
Date: Wed, 18 Mar 2009 11:01:54 +0900 (JST)
In-reply-to: <>
Organization: TOSHIBA Personal Computer System Corporation
Original-recipient: rfc822;
References: <> <> <>
On Tue, 17 Mar 2009 18:23:46 -0700, Dan Williams <> 
> Now, back to the issue at hand.  Does your driver still need direct
> control over chan->chan_id, or can it now rely on the fact that
> dma_async_device_register() will fail if a channel is not initialized?
>  Or, just use some platform_data to identify the channel in the same
> manner as atmel-mci?

Yes, I still want to control chan->chan_id.

The atmel-mci does not select "channel".  It just pick the first
usable channel of the dma_device specified by platform_data.  I
suppose dw_dmac is symmetric (it can use any channel for any slave).
But TXx9 SoC DMAC channels are hardwired to each peripheral devices.

And I want to call Channel-3 of DMAC-0 "dma0chan3" even if Channel-2
was assigned to for public memcpy channel.

Atsushi Nemoto

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