linux-kernel - Re: [PATCH v8 1/5] media: i2c: Add driver for RDACM21 camera module

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Date:   Mon, 8 Feb 2021 12:21:01 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc:     linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hyun Kwon <hyunk@...inx.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        sergei.shtylyov@...il.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v8 1/5] media: i2c: Add driver for RDACM21 camera module

Hi Jacopo,

On 14/01/2021 18:04, Jacopo Mondi wrote:
> The RDACM21 is a GMSL camera supporting 1280x1080 resolution images
> developed by IMI based on an Omnivision OV10640 sensor, an Omnivision
> OV490 ISP and a Maxim MAX9271 GMSL serializer.
> 
> The driver uses the max9271 library module, to maximize code reuse with
> other camera module drivers using the same serializer, such as rdacm20.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  MAINTAINERS                 |  12 +
>  drivers/media/i2c/Kconfig   |  13 +
>  drivers/media/i2c/Makefile  |   2 +
>  drivers/media/i2c/rdacm21.c | 623 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 650 insertions(+)
>  create mode 100644 drivers/media/i2c/rdacm21.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 14adf87d90c7..1822d73ed615 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14967,6 +14967,18 @@ F:	drivers/media/i2c/max9271.c
>  F:	drivers/media/i2c/max9271.h
>  F:	drivers/media/i2c/rdacm20.c
> 
> +RDACM21 Camera Sensor
> +M:	Jacopo Mondi <jacopo+renesas@...ndi.org>
> +M:	Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> +M:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> +M:	Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> +L:	linux-media@...r.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/media/i2c/rdacm2x-gmsl.yaml
> +F:	drivers/media/i2c/max9271.c
> +F:	drivers/media/i2c/max9271.h
> +F:	drivers/media/i2c/rdacm21.c
> +
>  RDC R-321X SoC
>  M:	Florian Fainelli <florian@...nwrt.org>
>  S:	Maintained
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 2b9d81e4794a..d500edb8638b 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -1212,6 +1212,19 @@ config VIDEO_RDACM20
>  	  This camera should be used in conjunction with a GMSL
>  	  deserialiser such as the MAX9286.
> 
> +config VIDEO_RDACM21
> +	tristate "IMI RDACM21 camera support"
> +	depends on I2C
> +	select V4L2_FWNODE
> +	select VIDEO_V4L2_SUBDEV_API
> +	select MEDIA_CONTROLLER
> +	help
> +	  This driver supports the IMI RDACM21 GMSL camera, used in
> +	  ADAS systems.
> +
> +	  This camera should be used in conjunction with a GMSL
> +	  deserialiser such as the MAX9286.
> +
>  config VIDEO_RJ54N1
>  	tristate "Sharp RJ54N1CB0C sensor support"
>  	depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index a3149dce21bb..85b1edc62508 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -124,6 +124,8 @@ 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_ST_MIPID02) += st-mipid02.o

This isn't right. The max9271 code exports various functions, but since it is
included with *two* modules (rdacm20/1-camera_module.ko) it is exported twice.

Since max9271 is not a self-contained driver it should not export symbols.

Can you provide a patch fixing that?

Thanks,

	Hans