linux-kernel - Re: [PATCH 5/5] dmaengine: sprd: Add 'device_config' and 'device_prep_slave

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Date:   Wed, 18 Apr 2018 13:40:54 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Lars-Peter Clausen <lars@...afoo.de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Eric Long <eric.long@...eadtrum.com>,
        Mark Brown <broonie@...nel.org>, dmaengine@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] dmaengine: sprd: Add 'device_config' and
 'device_prep_slave_sg' interfaces

On 17 April 2018 at 18:45, Lars-Peter Clausen <lars@...afoo.de> wrote:
> On 04/10/2018 09:46 AM, Baolin Wang wrote:
> [...]
>> +static int sprd_dma_slave_config(struct dma_chan *chan,
>> +                              struct dma_slave_config *config)
>> +{
>> +     struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
>> +     struct sprd_dma_config *slave_cfg =
>> +             container_of(config, struct sprd_dma_config, config);
>> +
>
> Please do not overload standard API with custom semantics. This makes the
> driver incompatible to the API and negates the whole idea of having a common
> API. E.g. this will crash when somebody passes a normal dma_slave_config
> struct to this function.
>

Yes, we have discussed with Vinod how to use 'dma_slave_config' to
reach our requirements. Thanks for your comments.

-- 
Baolin.wang
Best Regards