linux-kernel - Re: [PATCH v4 3/5] dmaengine: pxa: add pxa dmaengine driver

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Message-ID: <1432709723.27695.210.camel@x220>
Date:	Wed, 27 May 2015 08:55:23 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Jonathan Corbet <corbet@....net>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	dmaengine@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 3/5] dmaengine: pxa: add pxa dmaengine driver

On Wed, 2015-05-27 at 08:15 +0200, Robert Jarzmik wrote:
> Paul Bolle <pebolle@...cali.nl> writes:
> > Was it actually intended for PXA_DMA to be tristate?
> It is designed to be a module, and in the "end" it will be a module.
> 
> What is important to understand is the 3 phases which are going to happen :
>  - phase 1 : state after this is merged
>              pxa_dma must be builtin, for legacy support (see
>              pxad_toggle_reserved_channel()).
>  - phase 2 : slowly, all the pxa drivers are converted to dmaengine
>  - phase 3 : after full conversion, the patch "add support for legacy
>              transition" is reverted.
>              There pxa_dma will become modular, and the tristate will appear.
> 
> In conclusion, it cannot be a module yet, but it will in the future.

Thanks for this explanation. So I didn't miss a comment or some remark
in a commit explanation, did I?


Paul Bolle

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