linux-kernel - Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver

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Date:   Thu, 10 Jan 2019 17:00:07 +0000
From:   Luis de Oliveira <luis.oliveira@...opsys.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Luis Oliveira <luis.oliveira@...opsys.com>
CC:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <joao.pinto@...opsys.com>, <festevam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Neil Armstrong" <narmstrong@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Thierry Reding <treding@...dia.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Todor Tomov <todor.tomov@...aro.org>
Subject: Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver

Hi Laurent,

Sorry for taking so long to answer. I was stuck in other projects and lost track
of this.

My answers inline,

On 14-Nov-18 20:22, Laurent Pinchart wrote:
> Hi Luis,
> 
> Thank you for the patch.
> 
> On Friday, 19 October 2018 15:52:26 EET Luis Oliveira wrote:
>> Add the Synopsys MIPI CSI-2 controller driver. This
>> controller driver is divided in platform dependent functions
>> and core functions. It also includes a platform for future
>> DesignWare drivers.
>>
>> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
>> ---
>> Changelog
>> v2-V3
>> - exposed IPI settings to userspace
> 
> Could you please explain why you need this and can't use standard APIs ? 
> Custom sysfs attributes are needed, they need to be documented in 
> Documentation/ABI/.
> 

IPI - Image Pixel Interface enables to access direct video stream in our CSI-2
Host IP and needs to be configured to match the video source. I can't hard code
it. But maybe I can think of a way to configure it using the video configuration.
I will try do that in the next patchset.

>> - fixed headers
>>
>>  MAINTAINERS                              |  11 +
>>  drivers/media/platform/dwc/Kconfig       |  30 +-
>>  drivers/media/platform/dwc/Makefile      |   2 +
>>  drivers/media/platform/dwc/dw-csi-plat.c | 699 ++++++++++++++++++++++++++++
>>  drivers/media/platform/dwc/dw-csi-plat.h |  77 ++++
>>  drivers/media/platform/dwc/dw-mipi-csi.c | 494 ++++++++++++++++++++++
>>  drivers/media/platform/dwc/dw-mipi-csi.h | 202 +++++++++
>>  include/media/dwc/dw-mipi-csi-pltfrm.h   | 102 +++++
>>  8 files changed, 1616 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/media/platform/dwc/dw-csi-plat.c
>>  create mode 100644 drivers/media/platform/dwc/dw-csi-plat.h
>>  create mode 100644 drivers/media/platform/dwc/dw-mipi-csi.c
>>  create mode 100644 drivers/media/platform/dwc/dw-mipi-csi.h
>>  create mode 100644 include/media/dwc/dw-mipi-csi-pltfrm.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index da2e509..fd5f1fc 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -14032,6 +14032,16 @@ S:	Maintained
>>  F:	drivers/dma/dwi-axi-dmac/
>>  F:	Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt
>>
>> +SYNOPSYS DESIGNWARE MIPI CSI-2 HOST VIDEO PLATFORM
>> +M:	Luis Oliveira <luis.oliveira@...opsys.com>
>> +L:	linux-media@...r.kernel.org
>> +T:	git git://linuxtv.org/media_tree.git
>> +S:	Maintained
>> +F:	drivers/media/platform/dwc
>> +F:	include/media/dwc/dw-mipi-csi-pltfrm.h
>> +F:	Documentation/devicetree/bindings/media/snps,dw-csi-plat.txt
>> +F:	Documentation/devicetree/bindings/phy/snps,dphy-rx.txt
> 
> These two lines belong to patches 1/4 and 3/4. Doesn't checkpatch.pl warn 
> about this ? Now that I mentioned checkpatch.pl, I tried running it on this 
> series, and it generates a fair number of warnings and errors. Could you 
> please fix them ?
> 

I did, but maybe - or probably - i did not fix them all. Sorry.
I am preparing a new patchset and I will make sure everything goes right this time.

>> +
>>  SYNOPSYS DESIGNWARE DMAC DRIVER
>>  M:	Viresh Kumar <vireshk@...nel.org>
>>  R:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> @@ -16217,3 +16227,4 @@ T:	git
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git S:	Buried
>> alive in reporters
>>  F:	*
>>  F:	*/
>> +
> 
> Stray new line.
> 
Noted.

> [snip]
> 
Thank you,
Luis