linux-kernel - Re: [PATCH v2] dmaengine: s3c24xx: Add dma_slave

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Date:   Fri, 16 Sep 2016 13:16:31 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sam Van Den Berge <sam.van.den.berge@...enet.be>,
        vinod.koul@...el.com, dmaengine@...r.kernel.org
Cc:     kgene@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: s3c24xx: Add dma_slave_map for s3c2440
 devices

On 09/15/2016 09:41 PM, Sam Van Den Berge wrote:
> This patch updates the s3c24xx dma driver to be able to pass a
> dma_slave_map array via the platform data. This is needed to
> be able to use the new, simpler dmaengine API [1].
> I used the virtual DMA channels as a parameter for the dma_filter
> function. By doing that, I could reuse the existing filter function in
> drivers/dma/s3c24xx-dma.c.
> 
> I have tested this on my mini2440 board with the audio driver.
> (I first applied the audio fixes from Sylwester Nawrocki [2])
> According to my observations, dma_request_slave_channel in the
> function dmaengine_pcm_new in the file
> sound/soc/soc-generic-dmaengine-pcm.c now returns a valid DMA channel
> whereas before no DMA channel was returned at that point.
> 
> Entries for DMACH_XD0, DMACH_XD1 and DMACH_TIMER are missing because I
> don't realy know which driver to use for these.
> 
> [1]
> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/393635.html
> [2] http://www.spinics.net/lists/arm-kernel/msg521918.html
> 
> Signed-off-by: Sam Van Den Berge <sam.van.den.berge@...enet.be>
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> 
> ---
> 
> Changes since v1:
> - rename arm into dmaengine in title
> - one channel for s3c2440-sdi named "rx-tx"
> 
>  arch/arm/mach-s3c24xx/common.c            | 35 +++++++++++++++++++++++++++++++
>  drivers/dma/s3c24xx-dma.c                 |  3 +++
>  include/linux/platform_data/dma-s3c24xx.h |  6 ++++++
>  3 files changed, 44 insertions(+)

Vinod, do you want to take it through your tree? Not much difference for
me, so in such case:
Acked-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof