linux-kernel - Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM

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Message-Id: <201109161506.16505.laurent.pinchart@ideasonboard.com>
Date:	Fri, 16 Sep 2011 15:06:16 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	"Ravi, Deepthy" <deepthy.ravi@...com>
Cc:	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mchehab@...radead.org" <mchehab@...radead.org>,
	"g.liakhovetski@....de" <g.liakhovetski@....de>,
	"Hiremath, Vaibhav" <hvaibhav@...com>
Subject: Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM_STD ioctl

Hi Deepthy,

On Friday 16 September 2011 15:00:53 Ravi, Deepthy wrote:
> On Thursday, September 08, 2011 10:51 PM Laurent Pinchart wrote: 
> > On Thursday 08 September 2011 15:35:22 Deepthy Ravi wrote:
> >> From: Vaibhav Hiremath <hvaibhav@...com>
> >> 
> >> In order to support TVP5146 (for that matter any video decoder),
> >> it is important to support G/S/ENUM_STD ioctl on /dev/videoX
> >> device node.
> > 
> > Why so ? Shouldn't it be queried on the subdev output pad directly ?
> 
> Because standard v4l2 application for analog devices will call these std
> ioctls on the streaming device node. So it's done on /dev/video to make the
> existing apllication work.

Existing applications can't work with the OMAP3 ISP (and similar complex 
embedded devices) without userspace support anyway, either in the form of a 
GStreamer element or a libv4l plugin. I still believe that analog video 
standard operations should be added to the subdev pad operations and exposed 
through subdev device nodes, exactly as done with formats.

-- 
Regards,

Laurent Pinchart
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