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Message-ID: <Yi3ciCTbHrxYUatX@pendragon.ideasonboard.com>
Date: Sun, 13 Mar 2022 13:59:04 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
linux-usb@...r.kernel.org
Subject: Re: [PATCH] media: Kconfig: cleanup VIDEO_DEV dependencies
Hi Mauro,
Thank you for the patch.
Trimming the CC list to keep a few mailing lists only.
On Sun, Mar 13, 2022 at 08:12:05AM +0100, Mauro Carvalho Chehab wrote:
> media Kconfig has two entries associated to V4L API:
> VIDEO_DEV and VIDEO_V4L2.
>
> On Kernel 2.6.x, there were two V4L APIs, each one with its own flag.
> VIDEO_DEV were meant to:
> 1) enable Video4Linux and make its Kconfig options to appear;
> 2) it makes the Kernel build the V4L core.
>
> while VIDEO_V4L2 where used to distinguish between drivers that
> implement the newer API and drivers that implemented the former one.
>
> With time, such meaning changed, specially after the removal of
> all V4L version 1 drivers.
>
> At the current implementation, VIDEO_DEV only does (1): it enables
> the media options related to V4L, that now has:
>
> menu "Video4Linux options"
> visible if VIDEO_DEV
>
> source "drivers/media/v4l2-core/Kconfig"
> endmenu
>
> but it doesn't affect anymore the V4L core drivers.
>
> The rationale is that the V4L2 core has a "soft" dependency
> at the I2C bus, and now requires to select a number of other
> Kconfig options:
>
> config VIDEO_V4L2
> tristate
> depends on (I2C || I2C=n) && VIDEO_DEV
> select RATIONAL
> select VIDEOBUF2_V4L2 if VIDEOBUF2_CORE
> default (I2C || I2C=n) && VIDEO_DEV
>
> In the past, merging them would be tricky, but it seems that it is now
> possible to merge those symbols, in order to simplify V4L dependencies.
>
> Let's keep VIDEO_DEV, as this one is used on some make *defconfig
> configurations.
I would have gone for VIDEO_V4L2, but if it makes configuration changes
easier to handle, VIDEO_DEV is fine with me too.
> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
> ---
> drivers/input/rmi4/Kconfig | 2 +-
> drivers/input/touchscreen/Kconfig | 4 +-
> drivers/media/Kconfig | 3 +
> drivers/media/common/saa7146/Kconfig | 2 +-
> drivers/media/dvb-core/Kconfig | 2 +-
> drivers/media/dvb-frontends/Kconfig | 4 +-
> drivers/media/i2c/Kconfig | 250 +++++++++---------
> drivers/media/i2c/ccs/Kconfig | 2 +-
> drivers/media/i2c/cx25840/Kconfig | 2 +-
> drivers/media/i2c/et8ek8/Kconfig | 2 +-
> drivers/media/i2c/m5mols/Kconfig | 2 +-
> drivers/media/pci/Kconfig | 2 +-
> drivers/media/pci/bt8xx/Kconfig | 2 +-
> drivers/media/pci/cobalt/Kconfig | 2 +-
> drivers/media/pci/cx18/Kconfig | 2 +-
> drivers/media/pci/dt3155/Kconfig | 2 +-
> drivers/media/pci/intel/ipu3/Kconfig | 2 +-
> drivers/media/pci/ivtv/Kconfig | 2 +-
> drivers/media/pci/meye/Kconfig | 2 +-
> drivers/media/pci/saa7146/Kconfig | 6 +-
> drivers/media/pci/sta2x11/Kconfig | 2 +-
> drivers/media/pci/tw5864/Kconfig | 2 +-
> drivers/media/pci/tw68/Kconfig | 2 +-
> drivers/media/pci/tw686x/Kconfig | 2 +-
> drivers/media/platform/Kconfig | 6 +-
> drivers/media/platform/allegro-dvt/Kconfig | 2 +-
> drivers/media/platform/am437x/Kconfig | 2 +-
> drivers/media/platform/amphion/Kconfig | 2 +-
> drivers/media/platform/aspeed/Kconfig | 2 +-
> drivers/media/platform/atmel/Kconfig | 8 +-
> drivers/media/platform/cadence/Kconfig | 4 +-
> drivers/media/platform/coda/Kconfig | 2 +-
> drivers/media/platform/davinci/Kconfig | 12 +-
> drivers/media/platform/exynos-gsc/Kconfig | 2 +-
> drivers/media/platform/exynos4-is/Kconfig | 2 +-
> drivers/media/platform/intel/Kconfig | 2 +-
> drivers/media/platform/marvell-ccic/Kconfig | 4 +-
> drivers/media/platform/meson/ge2d/Kconfig | 2 +-
> drivers/media/platform/mtk-jpeg/Kconfig | 2 +-
> drivers/media/platform/mtk-mdp/Kconfig | 2 +-
> drivers/media/platform/mtk-vcodec/Kconfig | 2 +-
> drivers/media/platform/mtk-vpu/Kconfig | 2 +-
> drivers/media/platform/nxp/Kconfig | 8 +-
> drivers/media/platform/nxp/imx-jpeg/Kconfig | 2 +-
> drivers/media/platform/omap/Kconfig | 2 +-
> drivers/media/platform/omap3isp/Kconfig | 2 +-
> drivers/media/platform/qcom/camss/Kconfig | 2 +-
> drivers/media/platform/qcom/venus/Kconfig | 2 +-
> drivers/media/platform/renesas/Kconfig | 12 +-
> .../media/platform/renesas/rcar-vin/Kconfig | 4 +-
> drivers/media/platform/rockchip/rga/Kconfig | 2 +-
> .../media/platform/rockchip/rkisp1/Kconfig | 2 +-
> drivers/media/platform/s3c-camif/Kconfig | 2 +-
> drivers/media/platform/s5p-g2d/Kconfig | 2 +-
> drivers/media/platform/s5p-jpeg/Kconfig | 2 +-
> drivers/media/platform/s5p-mfc/Kconfig | 2 +-
> drivers/media/platform/sti/bdisp/Kconfig | 2 +-
> drivers/media/platform/sti/delta/Kconfig | 2 +-
> drivers/media/platform/sti/hva/Kconfig | 2 +-
> drivers/media/platform/stm32/Kconfig | 4 +-
> .../media/platform/sunxi/sun4i-csi/Kconfig | 2 +-
> .../media/platform/sunxi/sun6i-csi/Kconfig | 2 +-
> drivers/media/platform/sunxi/sun8i-di/Kconfig | 2 +-
> .../media/platform/sunxi/sun8i-rotate/Kconfig | 2 +-
> drivers/media/platform/tegra/vde/Kconfig | 2 +-
> drivers/media/platform/ti-vpe/Kconfig | 4 +-
> drivers/media/platform/via/Kconfig | 2 +-
> drivers/media/platform/xilinx/Kconfig | 2 +-
> drivers/media/radio/Kconfig | 54 ++--
> drivers/media/radio/si470x/Kconfig | 2 +-
> drivers/media/radio/wl128x/Kconfig | 2 +-
> drivers/media/spi/Kconfig | 4 +-
> drivers/media/test-drivers/Kconfig | 2 +-
> drivers/media/test-drivers/vicodec/Kconfig | 2 +-
> drivers/media/test-drivers/vimc/Kconfig | 2 +-
> drivers/media/test-drivers/vivid/Kconfig | 2 +-
> drivers/media/tuners/Kconfig | 6 +-
> drivers/media/tuners/e4000.c | 6 +-
> drivers/media/tuners/fc2580.c | 6 +-
> drivers/media/usb/airspy/Kconfig | 2 +-
> drivers/media/usb/au0828/Kconfig | 6 +-
> drivers/media/usb/cpia2/Kconfig | 2 +-
> drivers/media/usb/dvb-usb-v2/Kconfig | 8 +-
> drivers/media/usb/dvb-usb/Kconfig | 4 +-
> drivers/media/usb/gspca/Kconfig | 96 +++----
> drivers/media/usb/gspca/gl860/Kconfig | 2 +-
> drivers/media/usb/gspca/m5602/Kconfig | 2 +-
> drivers/media/usb/hackrf/Kconfig | 2 +-
> drivers/media/usb/hdpvr/Kconfig | 2 +-
> drivers/media/usb/msi2500/Kconfig | 2 +-
> drivers/media/usb/pvrusb2/Kconfig | 2 +-
> drivers/media/usb/pwc/Kconfig | 2 +-
> drivers/media/usb/s2255/Kconfig | 2 +-
> drivers/media/usb/stkwebcam/Kconfig | 2 +-
> drivers/media/usb/usbtv/Kconfig | 2 +-
> drivers/media/usb/uvc/Kconfig | 2 +-
> drivers/media/usb/zr364xx/Kconfig | 2 +-
> drivers/media/v4l2-core/Kconfig | 12 +-
> drivers/media/v4l2-core/Makefile | 2 +-
> drivers/staging/media/atomisp/Kconfig | 2 +-
> drivers/staging/media/atomisp/i2c/Kconfig | 14 +-
> drivers/staging/media/hantro/Kconfig | 2 +-
> drivers/staging/media/imx/Kconfig | 2 +-
> drivers/staging/media/ipu3/Kconfig | 2 +-
> drivers/staging/media/max96712/Kconfig | 2 +-
> drivers/staging/media/meson/vdec/Kconfig | 2 +-
> drivers/staging/media/omap4iss/Kconfig | 2 +-
> drivers/staging/media/rkvdec/Kconfig | 2 +-
> drivers/staging/media/sunxi/cedrus/Kconfig | 2 +-
> drivers/staging/media/tegra-video/Kconfig | 2 +-
> drivers/staging/media/zoran/Kconfig | 2 +-
> drivers/staging/most/video/Kconfig | 2 +-
> .../vc04_services/bcm2835-camera/Kconfig | 2 +-
> drivers/usb/gadget/Kconfig | 2 +-
> drivers/usb/gadget/legacy/Kconfig | 2 +-
> sound/pci/Kconfig | 4 +-
> 116 files changed, 363 insertions(+), 368 deletions(-)
[snip]
> diff --git a/drivers/media/pci/tw5864/Kconfig b/drivers/media/pci/tw5864/Kconfig
> index d376d4ed65b9..0a0f3191f238 100644
> --- a/drivers/media/pci/tw5864/Kconfig
> +++ b/drivers/media/pci/tw5864/Kconfig
> @@ -1,7 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> config VIDEO_TW5864
> tristate "Techwell TW5864 video/audio grabber and encoder"
> - depends on VIDEO_DEV && PCI && VIDEO_V4L2
> + depends on VIDEO_DEV && PCI && VIDEO_DEV
You can drop the second VIDEO_DEV.
> select VIDEOBUF2_DMA_CONTIG
> help
> Support for boards based on Techwell TW5864 chip which provides
> diff --git a/drivers/media/pci/tw68/Kconfig b/drivers/media/pci/tw68/Kconfig
> index af0cb60337bb..ef29be7db493 100644
> --- a/drivers/media/pci/tw68/Kconfig
> +++ b/drivers/media/pci/tw68/Kconfig
> @@ -1,7 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> config VIDEO_TW68
> tristate "Techwell tw68x Video For Linux"
> - depends on VIDEO_DEV && PCI && VIDEO_V4L2
> + depends on VIDEO_DEV && PCI && VIDEO_DEV
Here too.
Apart from that, the patch looks good to me.
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
I have however not evaluated the impact it will have on make oldconfig.
> select VIDEOBUF2_DMA_SG
> help
> Support for Techwell tw68xx based frame grabber boards.
[snip]
--
Regards,
Laurent Pinchart
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