package/libcamera: Enable python bindings

Since libcamera commit f513fd70ba1a ("subprojects: Drop leftovers of
pybind11"), merged before libcamera v0.1.0, libcamera has no longer
relied on an external subproject branch of pybind to build the python
bindings.

Provide a new package option to allow enabling the python bindings on
libcamera when python3 is available in the buildroot configuration.
Enabling the python bindings will select and bring in pybind as a
dependency.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libcamera/Config.in

@@ -24,6 +24,13 @@ menuconfig BR2_PACKAGE_LIBCAMERA
 
 if BR2_PACKAGE_LIBCAMERA
 
+config BR2_PACKAGE_LIBCAMERA_PYTHON
+	bool "python bindings"
+	depends on BR2_PACKAGE_PYTHON3
+	select BR2_PACKAGE_PYTHON_PYBIND
+	help
+	  Enable libcamera python bindings
+
 config BR2_PACKAGE_LIBCAMERA_V4L2
 	bool "libcamera v4l2 compatibility layer"
 	help

package/libcamera/libcamera.mk

@@ -19,7 +19,6 @@ LIBCAMERA_CONF_OPTS = \
 	-Dandroid=disabled \
 	-Ddocumentation=disabled \
 	-Dtest=false \
-	-Dpycamera=disabled \
 	-Dwerror=false
 LIBCAMERA_INSTALL_STAGING = YES
 LIBCAMERA_LICENSE = \
@@ -45,6 +44,13 @@ ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),y)
 LIBCAMERA_CXXFLAGS = -faligned-new
 endif
 
+ifeq ($(BR2_PACKAGE_LIBCAMERA_PYTHON),y)
+LIBCAMERA_DEPENDENCIES += python3 python-pybind
+LIBCAMERA_CONF_OPTS += -Dpycamera=enabled
+else
+LIBCAMERA_CONF_OPTS += -Dpycamera=disabled
+endif
+
 ifeq ($(BR2_PACKAGE_LIBCAMERA_V4L2),y)
 LIBCAMERA_CONF_OPTS += -Dv4l2=true
 else