@@ -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
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. Signed-off-by: Ojaswin Mujoo <ojaswin98@gmail.com> --- drivers/staging/vc04_services/Kconfig | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)