staging: vchiq: Add details to Kconfig help texts

Add some details to the Kconfig definitions of $CONFIG_VCHIQ_CDEV and
$CONFIG_BCM2835_VCHIQ to help make the motive behind the configs a bit
more clear.

Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Ojaswin Mujoo <ojaswin98@gmail.com>
Link: https://lore.kernel.org/r/ab88d3222088aca29a319147b50a9d1e9f0f8b81.1627925241.git.ojaswin98@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vc04_services/Kconfig b/drivers/staging/vc04_services/Kconfig
index ad44b80..cb7c824 100644 (file)
--- a/drivers/staging/vc04_services/Kconfig
+++ b/drivers/staging/vc04_services/Kconfig
@@ -15,18 +15,27 @@ config BCM2835_VCHIQ
        tristate "BCM2835 VCHIQ"
        imply VCHIQ_CDEV
        help
-               Kernel to VideoCore communication interface for the
-               BCM2835 family of products.
-               Defaults to Y when the Broadcom Videocore services
-               are included in the build, N otherwise.
+               Broadcom BCM2835 and similar SoCs have a VPU called VideoCore. This config
+               enables the VCHIQ driver, which implements a messaging interface between
+               the kernel and the firmware running on VideoCore. Other drivers use this
+               interface to communicate to the VPU. More specifically, the VCHIQ driver is
+               used by audio/video and camera drivers as well as for implementing MMAL
+               API, which is in turn used by several multimedia services on the BCM2835
+               family of SoCs.
+               Defaults to Y when the Broadcom Videocore services are included in
+               the build, N otherwise.
 
 if BCM2835_VCHIQ
 
 config VCHIQ_CDEV
        bool "VCHIQ Character Driver"
        help
-               Enable the creation of VCHIQ character driver to help
-               communicate with the Videocore platform.
+               Enable the creation of VCHIQ character driver. The cdev exposes ioctls used
+               by userspace libraries and testing tools to interact with VideoCore, via
+               the VCHIQ core driver (Check BCM2835_VCHIQ for more info).
+               This can be set to 'N' if the VideoCore communication is not needed by
+               userspace but only by other kernel modules (like bcm2835-audio).  If not
+               sure, set this to 'Y'.
 
 endif