linux-kernel - Re: [PATCH] media: Kconfig: make filtering devices optional

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Date:   Tue, 24 Mar 2020 13:04:50 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc:     linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] media: Kconfig: make filtering devices optional

Em Tue, 24 Mar 2020 13:01:21 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:

> The per-device option selection is a feature that some
> developers love, while others hate...
> 
> So, let's make both happy by making it optional.

In time: title here should be [PATCH v2].

> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
> 
> v2: simplify the Kconfig options by using a visible menu
> 
>  drivers/media/Kconfig | 32 +++++++++++++++++++++++++++-----
>  1 file changed, 27 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig
> index 4c06728a4ab7..e372029ac41f 100644
> --- a/drivers/media/Kconfig
> +++ b/drivers/media/Kconfig
> @@ -25,14 +25,32 @@ menuconfig MEDIA_SUPPORT
>  	  Additional info and docs are available on the web at
>  	  <https://linuxtv.org>
>  
> -menu "Types of devices to be supported"
> +if MEDIA_SUPPORT
> +
> +config MEDIA_SUPPORT_FILTER
> +	bool "Filter devices by their types"
>  	depends on MEDIA_SUPPORT
> +	help
> +	   Configuring the media subsystem can be complex, as there are
> +	   hundreds of drivers and other config options.
> +
> +	   This menu offers option that will help the Kernel's config
> +	   system to hide drivers that are out of the scope of the
> +	   user needs, and disabling core support for unused APIs.
> +
> +	   If not selected, all non-optional media core functionality
> +	   needed to support media drivers will be enabled. Also, all
> +	   media device drivers should be shown.
> +
> +menu "Media device types"
> +	visible if MEDIA_SUPPORT_FILTER
>  
>  #
>  # Multimedia support - automatically enable V4L2 and DVB core
>  #
>  config MEDIA_CAMERA_SUPPORT
>  	bool "Cameras and video grabbers"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable support for webcams and video grabbers.
>  
> @@ -40,6 +58,7 @@ config MEDIA_CAMERA_SUPPORT
>  
>  config MEDIA_ANALOG_TV_SUPPORT
>  	bool "Analog TV"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable analog TV support.
>  
> @@ -52,6 +71,7 @@ config MEDIA_ANALOG_TV_SUPPORT
>  
>  config MEDIA_DIGITAL_TV_SUPPORT
>  	bool "Digital TV"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable digital TV support.
>  
> @@ -60,6 +80,7 @@ config MEDIA_DIGITAL_TV_SUPPORT
>  
>  config MEDIA_RADIO_SUPPORT
>  	bool "AM/FM radio receivers/transmitters"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable AM/FM radio support.
>  
> @@ -74,6 +95,7 @@ config MEDIA_RADIO_SUPPORT
>  
>  config MEDIA_SDR_SUPPORT
>  	bool "Software defined radio"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable software defined radio support.
>  
> @@ -81,6 +103,7 @@ config MEDIA_SDR_SUPPORT
>  
>  config MEDIA_CEC_SUPPORT
>  	bool "HDMI CEC support"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable support for HDMI CEC (Consumer Electronics Control),
>  	  which is an optional HDMI feature.
> @@ -90,6 +113,7 @@ config MEDIA_CEC_SUPPORT
>  
>  config MEDIA_EMBEDDED_SUPPORT
>  	bool "Embedded devices (SoC)"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Enable support for complex cameras, codecs, and other hardware
>  	  found on Embedded hardware (SoC).
> @@ -98,6 +122,7 @@ config MEDIA_EMBEDDED_SUPPORT
>  
>  config MEDIA_TEST_SUPPORT
>  	bool "Test drivers"
> +	default y if !MEDIA_SUPPORT_FILTER
>  	help
>  	  Those drivers should not be used on production Kernels, but
>  	  can be useful on debug ones. It enables several dummy drivers
> @@ -106,10 +131,7 @@ config MEDIA_TEST_SUPPORT
>  	  have regressions.
>  
>  	  Say Y when you have a software defined radio device.
> -
> -endmenu # media support types
> -
> -if MEDIA_SUPPORT
> +endmenu # media device types
>  
>  comment "Media core options"
>  



Thanks,
Mauro