[libcamera-devel] [EXTERNAL] Re: Porting libCamera in to RDKC

[Peter Griffin]

Hi folks,

(plus Madhavan)

On Wed, 10 Jun 2020 at 00:48, Laurent Pinchart <
laurent.pinchart at ideasonboard.com> wrote:

> Hi Khem,
>
> On Tue, Jun 09, 2020 at 11:34:59PM +0000, Raj, Khem wrote:
> > Is it specific to soc ? We can also use rpi0 as reference
>
> The overall camera stack architecture shouldn't depend on a particular
> platform, but libcamera has SoC-specific support. We do support
> Raspberry Pi platforms, but out team has only tested Raspberry Pi 3 and
> 4. I believe the Raspberry Pi 0 should be supported in theory, but if I
> recall correctly the slower ARM core may make it a bit more challenging
> in practice.
>
> That being said, enabling libcamera support for the Ambarella SoCs would
> be interesting. It would require Ambarella-specific code in libcamera,
> which in turns would require kernel drivers to be submitted to the
> linux-media mailing list for upstream.
>

I did a quick bit of research into current Ambrella SoC support. It is used
in quite
a few products like Nest Camera, so the GPL kernel source is available from
here for example https://nest.com/legal/compliance/.

But it is a rather ancient 2.6.38 kernel. So a fair bit of work would be
required
just to port & upstream basic SoC support, migrate to DT etc, before
starting to
look at anything camera/media related.

Starting the RDKC integration of libcamera on the RPi3/4 platform where much
of the kernel, media drivers and libcamera work already exists would be much
quicker.

at *@comcast.com guys - meet Madhavan who is also working on RDKC topics
on RPi platform. It seems it maybe worth a sync with you folks to avoid
duplicating
effort.

Thanks,

Peter.


> > On Tuesday, June 9, 2020 8:44:32 AM, Dubey, Vijayanand wrote:
> > >
> > > Hi Laurent
> > > It's my bad, Ambarella does not have Upstream Linux Kernel Support.
> > >
> > > On 6/8/20, 1:06 PM, "Dubey, Vijayanand" wrote:
> > >> Hi Laurent
> > >> As per my understanding it does.. I posted the same question to SoC
> vendor
> > >> and will get back to you as soon as I get the answer from them.
> > >>
> > >> On 6/8/20, 11:02 AM, "Laurent Pinchart" wrote:
> > >>> On Mon, Jun 08, 2020 at 02:56:05PM +0000, Dubey, Vijayanand wrote:
> > >>>> Hi Laurent
> > >>>> Here are the current  RDKC cameras' SoC datasheets.
> > >>>>
> https://urldefense.com/v3/__https://www.ambarella.com/wp-content/uploads/S2Lm-Product-Brief-Final.pdf__;!!CQl3mcHX2A!ROSmZUzjossuIm3lDwqxahUsd2HOVTGF_wZhzZsaJbZxOCNCdhBvBmGPTRsYWcxau11N$
> (xCAM/iCAM2)
> > >>>>
> https://urldefense.com/v3/__http://www.ambarella.com/wp-content/uploads/S3L-Product-Brief.pdf(xCAM2)__;!!CQl3mcHX2A!ROSmZUzjossuIm3lDwqxahUsd2HOVTGF_wZhzZsaJbZxOCNCdhBvBmGPTRsYWUHTZhNc$
> > >>>>
> https://urldefense.com/v3/__https://www.ambarella.com/wp-content/uploads/S5L-Product-Brief.pdf(doorbell)__;!!CQl3mcHX2A!ROSmZUzjossuIm3lDwqxahUsd2HOVTGF_wZhzZsaJbZxOCNCdhBvBmGPTRsYWRqWEeYb$
> > >>>
> > >>> Thank you.
> > >>>
> > >>>> They are fully ARM SoCs and we do have upstream Linux kernel support
> > >>>> for these products.
> > >>>
> > >>> I don't see any device tree file for these SoCs in the upstream
> kernel.
> > >>> Am I missing something obvious ?
>
> --
> Regards,
>
> Laurent Pinchart
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