Myir AM437x Rico board support for Linux 4.1 kernel

Myir AM437x Rico board support for Linux 4.1 kernel

[Pavel Pisa]

Hello everybody,

I have been asked to help with Linux on Myir Rico board.
I have decided to try actual stable kernel from Ti tree

  git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
     branch ti-linux-4.1.y

instead of delivered dated 3.12.10 one to solve some issues
and have chance to port possible enhancements to mainline.

I have successfully prepared environment which loads kernel
over TFTP and boot actual Debian Jessie armhf from NFS export.

Because I have not found up to date device tree for this
board I have analyzed delivered sources against best matching
Ti kernel and then prepared DTS which works on the board
and I want to know if somebody works on this support, can help
to finish/better tune parameters and if there is chance
that configs are included into mainline or some other public
repository. Because I do not know who is working on this support
and who is right maintainer I send only pointers to my files.

http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard.dts
 based on Ti am437x-gp-evm.dts

http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard-hdmi.dts
 based on Ti am437x-gp-evm-hdmi.dts

http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard_defconfig

If there is interrest for discussion and inclusion, I send usual
inlined GIT patches series.

As for DTS, I expect that the regulators section does not match correctly
Rico board HW but it works for what client company needs
  evm_v3_3d: fixedregulator-v3_3d
  vtt_fixed: fixedregulator-vtt

Ethernet, serials, cameras, local MTD, SDcard and most of other devices works.
SPI Flash does not work. I have not invested time to that.

The client needs to connect special camera (infrared) to the VPFE so I have
spent some time on AM437x VPFE support enhancement.

I have added V4L2_PIX_FMT_Y10 pixel format and some minimal/stub 
implementation of vpfe_enum_frameintervals, vpfe_g_parm, vvpfe_s_parm, 
pfe_s_parm and I would be happy if my work can help to somebody other
as well. But work has been driven strict deadline to provide working
solution in one week so if there is interrest then most has to be
rewritten/clean up.

Generally, I am quite pleased by Ti's Linux tree state and support.
That week has been my first time with AM chips we used other archs
(powerpc and multiple i.MXs for most of our other projects till now).

Probably off topic for these lists but what are suggested options
for graphic configuration when Qt4/E or Qt5 is run on framebuffer.
Is it better to use CONFIG_DRM_OMAP or CONFIG_FB_OMAP2 ?
Is SGX driver available for 4.1 Linux kernel (reply offlist, please,
if proprietary only)? Are there other possibilities how to use
OMAP AM437xx hardware to accelerate video color and formats
transformations? Can be VPFE planes used somehow to embed
video in Qt application? I, personally, prefer strongly
opensource only options but target company has probably minimal
requirements in this area.

Thanks for feedback,

                Pavel Pisa
    e-mail:     pisa-/N2ztlQkxE7Ub/6JBqosbQ@public.gmane.org
    www:        http://cmp.felk.cvut.cz/~pisa
    university: http://dce.fel.cvut.cz/
    company:    http://www.pikron.com/
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Re: Myir AM437x Rico board support for Linux 4.1 kernel

[Roger Quadros]

+Tony, Tomi, linux-omap

Hi Pavel,

On 25/08/15 16:39, Pavel Pisa wrote:
> Hello everybody,
> 
> I have been asked to help with Linux on Myir Rico board.
> I have decided to try actual stable kernel from Ti tree
> 
>   git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
>      branch ti-linux-4.1.y
> 
> instead of delivered dated 3.12.10 one to solve some issues
> and have chance to port possible enhancements to mainline.
> 
> I have successfully prepared environment which loads kernel
> over TFTP and boot actual Debian Jessie armhf from NFS export.
> 
> Because I have not found up to date device tree for this
> board I have analyzed delivered sources against best matching
> Ti kernel and then prepared DTS which works on the board
> and I want to know if somebody works on this support, can help
> to finish/better tune parameters and if there is chance
> that configs are included into mainline or some other public
> repository. Because I do not know who is working on this support
> and who is right maintainer I send only pointers to my files.

Tony Lindgren is the OMAP platform maintainer and you must
include linux-omap mailing list in in the discussion.

> 
> http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard.dts
>  based on Ti am437x-gp-evm.dts
> 
> http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard-hdmi.dts
>  based on Ti am437x-gp-evm-hdmi.dts
> 
> http://cmp.felk.cvut.cz/~pisa/arm/myir-rico/am437x-myir-ricoboard_defconfig
> 
> If there is interrest for discussion and inclusion, I send usual
> inlined GIT patches series.

Please send patches for the new board so that we can review.

> 
> As for DTS, I expect that the regulators section does not match correctly
> Rico board HW but it works for what client company needs
>   evm_v3_3d: fixedregulator-v3_3d
>   vtt_fixed: fixedregulator-vtt
> 
> Ethernet, serials, cameras, local MTD, SDcard and most of other devices works.
> SPI Flash does not work. I have not invested time to that.
> 
> The client needs to connect special camera (infrared) to the VPFE so I have
> spent some time on AM437x VPFE support enhancement.
> 
> I have added V4L2_PIX_FMT_Y10 pixel format and some minimal/stub 
> implementation of vpfe_enum_frameintervals, vpfe_g_parm, vvpfe_s_parm, 
> pfe_s_parm and I would be happy if my work can help to somebody other
> as well. But work has been driven strict deadline to provide working
> solution in one week so if there is interrest then most has to be
> rewritten/clean up.
> 
> Generally, I am quite pleased by Ti's Linux tree state and support.
> That week has been my first time with AM chips we used other archs
> (powerpc and multiple i.MXs for most of our other projects till now).
> 
> Probably off topic for these lists but what are suggested options
> for graphic configuration when Qt4/E or Qt5 is run on framebuffer.
> Is it better to use CONFIG_DRM_OMAP or CONFIG_FB_OMAP2 ?
> Is SGX driver available for 4.1 Linux kernel (reply offlist, please,
> if proprietary only)? Are there other possibilities how to use
> OMAP AM437xx hardware to accelerate video color and formats
> transformations? Can be VPFE planes used somehow to embed
> video in Qt application? I, personally, prefer strongly
> opensource only options but target company has probably minimal
> requirements in this area.

Tomi might be able to answer video related questions.

cheers,
-roger
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