linux-kernel - [PATCH v2 09/20] media: Kconfig: make filtering devices optional

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Date:   Tue, 24 Mar 2020 14:43:02 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH v2 09/20] media: Kconfig: make filtering devices optional

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.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 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"
 
-- 
2.24.1