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

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Message-ID: <87siaizguz.fsf@belgarion.home>
Date:	Wed, 27 May 2015 08:15:00 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Paul Bolle <pebolle@...cali.nl>
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

Paul Bolle <pebolle@...cali.nl> writes:

> Vinod already applied this, so my remarks, if valid, should probably be
> handled in a follow up patch.
>
>> +module_platform_driver(pxad_driver);
>
> (The series starting at https://lkml.org/lkml/2015/5/10/131 would allow
> to use builtin_platform_driver() for built-in only code.)
I won't be that way for forever, see next comment.

>> +MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver");
>> +MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@...e.fr>");
>> +MODULE_LICENSE("GPL v2");
>
> This patch added a bool Kconfig symbol. So pxa_dma.c will never be part
> of a module.
> Its code contains a few module specific macros. 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.

Cheers.

-- 
Robert
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