linux-kernel - Re: [PATCH 08/10] ASoC: ux500_pcm: Differentiate between pdata and DT initialisation

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Date:	Tue, 19 Nov 2013 19:33:41 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...aro.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 08/10] ASoC: ux500_pcm: Differentiate between pdata and
 DT initialisation

On Tue, 19 Nov 2013, Mark Brown wrote:

> On Tue, Nov 19, 2013 at 11:07:47AM +0000, Lee Jones wrote:
> 
> > require slightly different flags to inform the core that we 'are'
> > booting with DT.
> 
> Is there some situation when we would want to say we're booting from DT
> when we aren't?  Just wondering about the quotes.

The quotes do 'not' mean anything special. :)

> > +static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
> > +	.pcm_hardware = &ux500_pcm_hw,
> > +	.prealloc_buffer_size = 128 * 1024,
> 
> You shouldn't need to set this explicitly, the generic code should be
> able to pick a number for you - if you do need this number please
> explain why the number was chosen in the comments (or fix the core to
> guess better).  At the minute the core just makes up a number too but at
> least then it's a consistent random number between platforms.
> 
> Can you also get away without the pcm_hardware - the core should also
> have support for discovering this by querying the DMA controller?

Despite the '+'s, I'm not actually adding these parameters, I'm
duplicating the pdata version and removing the stuff I 'know' that's
not required. I don't know what happens when/if these two parameters
are removed. I can add this to my TODO when I rip out platform data
support, which will happen when this stuff lands.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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