linux-kernel - Re: [PATCH] media: i2c/Kconfig: Select FWNODE for OV772x sensor

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Date:   Wed, 20 Jan 2021 11:09:15 +0000
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] media: i2c/Kconfig: Select FWNODE for OV772x sensor

On 20/01/2021 10:36, Sakari Ailus wrote:
> On Wed, Jan 20, 2021 at 10:17:14AM +0000, Kieran Bingham wrote:
>> Hi Lad,
>>
>> On 20/01/2021 09:01, Lad Prabhakar wrote:
>>> Fix OV772x build breakage by selecting V4L2_FWNODE config:
>>>
>>> ia64-linux-ld: drivers/media/i2c/ov772x.o: in function `ov772x_probe':
>>> ov772x.c:(.text+0x1ee2): undefined reference to `v4l2_fwnode_endpoint_alloc_parse'
>>> ia64-linux-ld: ov772x.c:(.text+0x1f12): undefined reference to `v4l2_fwnode_endpoint_free'
>>> ia64-linux-ld: ov772x.c:(.text+0x2212): undefined reference to `v4l2_fwnode_endpoint_alloc_parse'
>>>
>>> Fixes: 8a10b4e3601e ("media: i2c: ov772x: Parse endpoint properties")
>>> Reported-by: kernel test robot <lkp@...el.com>
>>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>>
>> I see this driver uses subdev API too.
>>
>> Should the driver also select VIDEO_V4L2_SUBDEV_API?
> 
> Yes, it should. Another patch? This one fixes a compilation problem.

Yes, it's probably another patch, because indeed this is a specific fix.

I wonder if that means the builders haven't been able to construct a
combination without VIDEO_V4L2_SUBDEV_API...

--
Kieran


>> Or is that covered sufficiently already on any platforms that would use
>> the driver?
>>
>> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>>
>>> ---
>>>  drivers/media/i2c/Kconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>>> index eddb10220953..bb1b5a340431 100644
>>> --- a/drivers/media/i2c/Kconfig
>>> +++ b/drivers/media/i2c/Kconfig
>>> @@ -1013,6 +1013,7 @@ config VIDEO_OV772X
>>>  	tristate "OmniVision OV772x sensor support"
>>>  	depends on I2C && VIDEO_V4L2
>>>  	select REGMAP_SCCB
>>> +	select V4L2_FWNODE
>>>  	help
>>>  	  This is a Video4Linux2 sensor driver for the OmniVision
>>>  	  OV772x camera.
>>>
>>
>