From: Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
To: Yong <yong.deng-+3dxTMOEIRNWk0Htik3J/w@public.gmane.org>,
Randy Dunlap <rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
Mauro Carvalho Chehab
<mchehab-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
Linus Walleij
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Hans Verkuil
<hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>,
Stanimir Varbanov
<stanimir.varbanov-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Hugues Fruchet <hugues.fruchet-qxv4g6HH51o@public.gmane.org>,
Yannick Fertre <yannick.fertre-qxv4g6HH51o@public.gmane.org>,
Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
Benjamin Gaignard
<benjamin.gaignard-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Ramesh Shanmugasundaram
<ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org>,
Sakari Ailus
<sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Rick Chang <rick.chang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel@vger.k
Subject: Re: [PATCH v7 2/2] media: V3s: Add support for Allwinner CSI.
Date: Mon, 26 Feb 2018 12:06:37 +0100 [thread overview]
Message-ID: <ce3a30b9-f017-61b6-1fe6-f5dcc8bd3ec3@xs4all.nl> (raw)
In-Reply-To: <20180130104833.a06e44c558c7ddc6b38e20b3-+3dxTMOEIRNWk0Htik3J/w@public.gmane.org>
Hi all,
On 01/30/2018 03:48 AM, Yong wrote:
> Hi,
>
> On Mon, 29 Jan 2018 13:49:14 -0800
> Randy Dunlap <rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> wrote:
>
>> On 01/29/2018 01:21 AM, Yong Deng wrote:
>>> Allwinner V3s SoC features two CSI module. CSI0 is used for MIPI CSI-2
>>> interface and CSI1 is used for parallel interface. This is not
>>> documented in datasheet but by test and guess.
>>>
>>> This patch implement a v4l2 framework driver for it.
>>>
>>> Currently, the driver only support the parallel interface. MIPI-CSI2,
>>> ISP's support are not included in this patch.
>>>
>>> Tested-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
>>> Signed-off-by: Yong Deng <yong.deng-+3dxTMOEIRNWk0Htik3J/w@public.gmane.org>
>>> ---
>>
>>
>> A previous version (I think v6) had a build error with the use of
>> PHYS_OFFSET, so Kconfig was modified to depend on ARM and ARCH_SUNXI
>> (one of which seems to be overkill). As is here, the COMPILE_TEST piece is
>> meaningless for all arches except ARM. If you care enough for COMPILE_TEST
>> (and I would), then you could make COMPILE_TEST useful on any arch by
>> removing the "depends on ARM" (the ARCH_SUNXI takes care of that) and by
>> having an alternate value for PHYS_OFFSET, like so:
>>
>> +#if defined(CONFIG_COMPILE_TEST) && !defined(PHYS_OFFSET)
>> +#define PHYS_OFFSET 0
>> +#endif
>>
>> With those 2 changes, the driver builds for me on x86_64.
>
> I have considered this method.
> But it's so sick to put these code in dirver (for my own). I mean
> this is meaningless for the driver itself and make people confused.
>
> I grepped the driver/ code and I found many drivers writing Kconfig
> like this. For example:
> ARM && COMPILE_TEST
> MIPS && COMPILE_TEST
> PPC64 && COMPILE_TEST
>
> BTW, for my own, I do not care about COMPILE_TEST.
There was a discussion about this in the v6 patch, but it petered out.
I want to merge this driver, but I would very much prefer that this
compiles with COMPILE_TEST. So unless someone has a better solution, then
adding 'hack' that defines PHYS_OFFSET to 0 for COMPILE_TEST would be required.
Otherwise this driver looks good, so it is just this issue blocking it.
Regards,
Hans
>
>>
>>> diff --git a/drivers/media/platform/sunxi/sun6i-csi/Kconfig b/drivers/media/platform/sunxi/sun6i-csi/Kconfig
>>> new file mode 100644
>>> index 0000000..f80c965
>>> --- /dev/null
>>> +++ b/drivers/media/platform/sunxi/sun6i-csi/Kconfig
>>> @@ -0,0 +1,10 @@
>>> +config VIDEO_SUN6I_CSI
>>> + tristate "Allwinner V3s Camera Sensor Interface driver"
>>> + depends on ARM
>>> + depends on VIDEO_V4L2 && COMMON_CLK && VIDEO_V4L2_SUBDEV_API && HAS_DMA
>>> + depends on ARCH_SUNXI || COMPILE_TEST
>>> + select VIDEOBUF2_DMA_CONTIG
>>> + select REGMAP_MMIO
>>> + select V4L2_FWNODE
>>> + ---help---
>>> + Support for the Allwinner Camera Sensor Interface Controller on V3s.
>>
>> thanks,
>> --
>> ~Randy
>
>
> Thanks,
> Yong
>
next prev parent reply other threads:[~2018-02-26 11:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-29 9:21 [PATCH v7 2/2] media: V3s: Add support for Allwinner CSI Yong Deng
2018-01-29 21:49 ` Randy Dunlap
[not found] ` <c86097d7-dade-01e5-3826-3f22f9ca4b4f-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-01-29 23:12 ` Arnd Bergmann
2018-01-30 2:48 ` Yong
[not found] ` <20180130104833.a06e44c558c7ddc6b38e20b3-+3dxTMOEIRNWk0Htik3J/w@public.gmane.org>
2018-02-26 11:06 ` Hans Verkuil [this message]
[not found] ` <ce3a30b9-f017-61b6-1fe6-f5dcc8bd3ec3-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
2018-02-27 1:18 ` Yong
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