Re: [PATCH] media: i2c: Kconfig: Make MAX9271 a module

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Hi Sakari and Jacopo,

On Mon, Feb 08, 2021 at 10:21:47PM +0200, Sakari Ailus wrote:
> On Mon, Feb 08, 2021 at 07:20:06PM +0100, Jacopo Mondi wrote:
> > With the introduction of the RDACM21 camera module support in
> > commit a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
> > the symbols defined by the max9271 library were exported twice
> > if multiple users of the library were compiled in at the same time.
> > 
> > In example:
> > WARNING: modpost: drivers/media/i2c/rdacm21-camera_module:
> > 'max9271_set_serial_link' exported twice. Previous export was in
> > drivers/media/i2c/rdacm20-camera_module.ko
> > 
> > Fix this by making the rdacm21 file a module and have the driver
> > using its functions select it.
> > 
> > Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
> > Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> > Suggested-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> > ---
> >  drivers/media/i2c/Kconfig  | 5 +++++
> >  drivers/media/i2c/Makefile | 7 +++----
> >  2 files changed, 8 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 2d3dc0d82f9e..84645f751da3 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -1240,12 +1240,16 @@ config VIDEO_NOON010PC30
> > 
> >  source "drivers/media/i2c/m5mols/Kconfig"
> > 
> > +config VIDEO_MAX9271
> 
> How about calling this VIDEO_MAX9271_HELPER instead? It's not a driver in
> the proper sense of the word.

Not all Kconfig symbols refer to drivers. Should we rename V4L2_FWNODE
to V4L2_FWNODE_HELPER ? :-)

Of course the MAX9271 name may lead someone to believe that the symbol
refers to a driver. If you think we should really make this explicit,
I'd have a preference for LIB instead of HELPER.

Either way,

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

> Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> 
> > +	tristate
> > +
> >  config VIDEO_RDACM20
> >  	tristate "IMI RDACM20 camera support"
> >  	depends on I2C
> >  	select V4L2_FWNODE
> >  	select VIDEO_V4L2_SUBDEV_API
> >  	select MEDIA_CONTROLLER
> > +	select VIDEO_MAX9271
> >  	help
> >  	  This driver supports the IMI RDACM20 GMSL camera, used in
> >  	  ADAS systems.
> > @@ -1259,6 +1263,7 @@ config VIDEO_RDACM21
> >  	select V4L2_FWNODE
> >  	select VIDEO_V4L2_SUBDEV_API
> >  	select MEDIA_CONTROLLER
> > +	select VIDEO_MAX9271
> >  	help
> >  	  This driver supports the IMI RDACM21 GMSL camera, used in
> >  	  ADAS systems.
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index 6bd22d63e1a7..c34a7de3158b 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -125,10 +125,9 @@ obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
> >  obj-$(CONFIG_VIDEO_IMX334)	+= imx334.o
> >  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
> >  obj-$(CONFIG_VIDEO_MAX9286)	+= max9286.o
> > -rdacm20-camera_module-objs	:= rdacm20.o max9271.o
> > -obj-$(CONFIG_VIDEO_RDACM20)	+= rdacm20-camera_module.o
> > -rdacm21-camera_module-objs	:= rdacm21.o max9271.o
> > -obj-$(CONFIG_VIDEO_RDACM21)	+= rdacm21-camera_module.o
> > +obj-$(CONFIG_VIDEO_MAX9271)	+= max9271.o
> > +obj-$(CONFIG_VIDEO_RDACM20)	+= rdacm20.o
> > +obj-$(CONFIG_VIDEO_RDACM21)	+= rdacm21.o
> >  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> > 
> >  obj-$(CONFIG_SDR_MAX2175) += max2175.o

-- 
Regards,

Laurent Pinchart



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