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

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Date:   Wed, 20 Jan 2021 11:13:27 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        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 <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH] media: i2c/Kconfig: Select FWNODE for OV772x sensor

On Wed, Jan 20, 2021 at 11:09 AM Kieran Bingham
<kieran.bingham+renesas@...asonboard.com> wrote:
>
> 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...
>
Thats because v4l2-subdev.o is built irrespective of
VIDEO_V4L2_SUBDEV_API enabled/disabled and there are empty fillers in
v4l2-subdev.c when VIDEO_V4L2_SUBDEV_API is disabled.

Cheers,
Prabhakar
> --
> 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.
> >>>
> >>
> >
>