linux-kernel - Re: [PATCHv2 0/4] LS1021A: Add dcfb framebuffer driver support.

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Message-ID: <548024C7.3060004@ti.com>
Date:	Thu, 4 Dec 2014 11:09:27 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	"plagnioj@...osoft.com" <plagnioj@...osoft.com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"alexander.stein@...tec-electronic.com" 
	<alexander.stein@...tec-electronic.com>
Subject: Re: [PATCHv2 0/4] LS1021A: Add dcfb framebuffer driver support.

On 04/12/14 10:30, Li.Xiubo@...escale.com wrote:

> Sorry for confusing, it was delayed for other reasons internal.
> 
> I am not familiar about the DRM, and I'd like to know if the DRM driver will be
> support, should I also develop the libdrm too ? Or just coding in kernel level ?

For simple drm drivers (this looks like it would be a simple one), I
don't think there's any need for libdrm support. The generic DRM
interfaces should be enough, so just kernel level coding needed.

> Is there any Document about how to have /dev/fbX device to use ?

There's DRM documentation here:

https://www.kernel.org/doc/htmldocs/drm/index.html

And many existing drivers to use as examples. The dri-devel list
(http://lists.freedesktop.org/mailman/listinfo/dri-devel), which is the
mailing list used for DRM development, is active and you probably can
get more support from there than from the fbdev list.

It should not be a huge effort to write a drm driver for a simple LCD
controller like this. I would bet that you can write a working driver in
a week.

> If possible, I'd like this could be accept for this time. And I will add the DRM
> Version later(for developing and testing will take a long time).

I'm sorry but "it was delayed for internal reasons" and "our customer
needs this driver" are not very good reasons for getting a driver merged
to mainline Linux.

You can provide your driver to your customer as a separate patch series
which they can apply. There should be no conflicts or other issues
there, so it should be simple.

 Tomi

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