linux-kernel - Re: [PATCH 4/4] DMA: PL330: add device tree property for DMA

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Date:	Wed, 12 Dec 2012 13:06:14 +0530
From:	Jassi Brar <jassisinghbrar@...il.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Jassi Brar <jaswinder.singh@...aro.org>, kgene.kim@...sung.com,
	pawel.moll@....com, vinod.koul@...el.com, t.figa@...sung.com,
	linux-kernel@...r.kernel.org, rob.herring@...xeda.com,
	kyungmin.park@...sung.com, linux-samsung-soc@...r.kernel.org,
	dinguyen@...era.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] DMA: PL330: add device tree property for DMA_MEMCPY capability

On Fri, Nov 30, 2012 at 4:26 PM, Bartlomiej Zolnierkiewicz
<b.zolnierkie@...sung.com> wrote:

> Thank you for explaining it.  Here is a patch implementing the idea:
>
> From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Subject: [PATCH] DMA: PL330: add peripherals map to the device tree
>
> Add device tree (DT) property ("peri-map") for storing indices
> of peripherals connected to DMAC and fix DT nodes of client
> drivers to use 'dma peripheral id' instead of 'dma request id'.
> Also instead of setting DMA_MEMCPY capability unconditionally in
> pl330_probe() do it only when "peri-map" DT property is present
> (idea from Jassi Brar).  It fixes the issue on ARM EXYNOS
> platforms using DT where pdma controller erroneously was used
> for DMA_MEMCPY operations instead of mdma one (it seems to work
> correctly but at the cost of worse performance).
>
Sorry, we need to change it as per new generic dma DT bindings
  http://git.infradead.org/users/vkoul/slave-dma.git/blob/refs/heads/next:/Documentation/devicetree/bindings/dma/dma.txt

Thanks.
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