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

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Message-ID: <CA+V-a8vhRLC2EsKJRjuf1ZyABnSyeLBg+OTOKetzA62Eybqv3w@mail.gmail.com>
Date:	Thu, 5 Feb 2015 11:55:28 +0000
From:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.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>
Subject: Re: [PATCH] media: i2c: add support for omnivision's ov2659 sensor

Hi Laurent,

On Thu, Feb 5, 2015 at 11:53 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Prabhakar,
>
> 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.

Regards,
--Prabhakar
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