linux-kernel - Re: [alsa-devel] [PATCH 2/2] ASoC: atmel-pcm: use generic dmaengine framework

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Message-ID: <51D3DBE8.4090407@metafoo.de>
Date:	Wed, 03 Jul 2013 10:08:08 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Bo Shen <voice.shen@...el.com>
CC:	Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
	richard.genoud@...il.com, Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH 2/2] ASoC: atmel-pcm: use generic dmaengine
 framework

On 07/03/2013 09:57 AM, Bo Shen wrote:
> Hi Lars,
> 
> On 7/3/2013 15:36, Lars-Peter Clausen wrote:
>>>>> +        slave_config->dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
>>>> >>[...]
>>>>> >>>+        slave_config->src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
>>>> >>
>>>> >>Change the type of phybase to dma_addr_t
>>> >
>>> >It should be:
>>> >slave_config->dst_addr = (dma_addr_t)(ssc->phybase + SSC_THR);
>>> >slave_config->src_addr = (dma_addr_t)(ssc->phybase + SSC_RHR);
>> The type of phybase in the ssc_device struct should be changed from
>> resource_size_t to dma_addr_t.
> 
> Actually, the phybase in ssc_device structure is resource_size_t which used to
> access the ssc device register.
> Here, we use ssc register as dma source address or destination address, so we
> convert it to dma_addr_t type. So, not need to change, am I right?

Isn't 'regs' used to access the registers? As far as I can see phybase is only
used in the audio DMA driver.

- Lars
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