linux-kernel - Re: [PATCH] media: i2c: add support for omnivision's ov2659 sensor

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Date:	Thu, 05 Feb 2015 16:52:22 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Sakari Ailus <sakari.ailus@....fi>,
	Hans Verkuil <hverkuil@...all.nl>,
	Benoit Parrot <bparrot@...com>
Subject: Re: [PATCH] media: i2c: add support for omnivision's ov2659 sensor

Hi Prabhakar,

(CC'ing Benoit Parrot)

On Thursday 05 February 2015 11:55:28 Lad, Prabhakar wrote:
> On Thu, Feb 5, 2015 at 11:53 AM, Laurent Pinchart wrote:
> > On Wednesday 04 February 2015 20:55:02 Lad, Prabhakar wrote:
> >> On Wed, Feb 4, 2015 at 5:03 PM, Laurent Pinchart wrote:
> >> > On Thursday 15 January 2015 23:39:23 Lad, Prabhakar wrote:
> >> >> From: Benoit Parrot <bparrot@...com>
> >> >> 
> >> >> this patch adds support for omnivision's ov2659
> >> >> sensor.
> >> >> 
> >> >> Signed-off-by: Benoit Parrot <bparrot@...com>
> >> >> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> >> >> ---
> >> >> 
> >> >>  .../devicetree/bindings/media/i2c/ov2659.txt       |   33 +
> >> >>  .../devicetree/bindings/vendor-prefixes.txt        |    1 +
> >> >>  MAINTAINERS                                        |   10 +
> >> >>  drivers/media/i2c/Kconfig                          |   11 +
> >> >>  drivers/media/i2c/Makefile                         |    1 +
> >> >>  drivers/media/i2c/ov2659.c                         | 1623 +++++++++++
> >> >>  include/media/ov2659.h                             |   33 +
> >> >>  7 files changed, 1712 insertions(+)
> >> >>  create mode 100644
> >> >>  Documentation/devicetree/bindings/media/i2c/ov2659.txt
> >> >>  create mode 100644 drivers/media/i2c/ov2659.c
> >> >>  create mode 100644 include/media/ov2659.h
> > 
> > [snip]
> > 
> >> >> diff --git a/drivers/media/i2c/ov2659.c b/drivers/media/i2c/ov2659.c
> >> >> new file mode 100644
> >> >> index 0000000..ce8ec8d
> >> >> --- /dev/null
> >> >> +++ b/drivers/media/i2c/ov2659.c
> >> >> @@ -0,0 +1,1623 @@
> > 
> > [snip]
> > 
> >> >> +static const struct ov2659_framesize ov2659_framesizes[] = {
> >> >> +     { /* QVGA */
> >> >> +             .width          = 320,
> >> >> +             .height         = 240,
> >> >> +             .regs           = ov2659_qvga,
> >> >> +             .max_exp_lines  = 248,
> >> >> +     }, { /* VGA */
> >> >> +             .width          = 640,
> >> >> +             .height         = 480,
> >> >> +             .regs           = ov2659_vga,
> >> >> +             .max_exp_lines  = 498,
> >> >> +     }, { /* SVGA */
> >> >> +             .width          = 800,
> >> >> +             .height         = 600,
> >> >> +             .regs           = ov2659_svga,
> >> >> +             .max_exp_lines  = 498,
> >> >> +     }, { /* XGA */
> >> >> +             .width          = 1024,
> >> >> +             .height         = 768,
> >> >> +             .regs           = ov2659_xga,
> >> >> +             .max_exp_lines  = 498,
> >> >> +     }, { /* 720P */
> >> >> +             .width          = 1280,
> >> >> +             .height         = 720,
> >> >> +             .regs           = ov2659_720p,
> >> >> +             .max_exp_lines  = 498,
> >> >> +     }, { /* SXGA */
> >> >> +             .width          = 1280,
> >> >> +             .height         = 1024,
> >> >> +             .regs           = ov2659_sxga,
> >> >> +             .max_exp_lines  = 1048,
> >> >> +     }, { /* UXGA */
> >> >> +             .width          = 1600,
> >> >> +             .height         = 1200,
> >> >> +             .regs           = ov2659_uxga,
> >> >> +             .max_exp_lines  = 498,
> >> >> +     },
> >> >> +};
> >> > 
> >> > That's what bothers me the most about drivers for Omnivision sensors.
> >> > For some reason (I'd bet on lack of proper documentation) they list a
> >> > couple of supported resolutions with corresponding register values,
> >> > instead of computing the register values from the format configured by
> >> > userspace. That's not the way we want to go. Prabhakar, do you have
> >> > enough documentation to fix that ?
> >> 
> >> I am afraid I have limited documentation here.
> > 
> > How limited ? :-) I assume someone has documentation, given that the patch
> > contains a larger number of #define's with register names.
> 
> Yea I don’t have NDA signed with TI/Omnivision :( because I which I
> lack the documentation.

And a quick online search doesn't show any leaked datasheet. Wikileaks isn't 
doing a good job ;-)

Benoit, do you think this is something that can be fixed ?

-- 
Regards,

Laurent Pinchart

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