initial buildroot for linux 5.15

package/dav1d/Config.in

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+config BR2_PACKAGE_DAV1D
+	bool "dav1d"
+	depends on !BR2_STATIC_LIBS # dlfcn.h
+	depends on BR2_TOOLCHAIN_HAS_THREADS # pthread
+	help
+	  dav1d is a new AV1 cross-platform decoder, open-source, and
+	  focused on speed and correctness.
+
+	  https://code.videolan.org/videolan/dav1d
+
+comment "dav1d needs a toolchain w/ threads, dynamic library"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS

package/dav1d/dav1d.hash

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+# Locally computed
+sha256  0d198c4fe63fe7f0395b1b17de75b21c8c4508cd3204996229355759efa30ef8  dav1d-0.9.2.tar.bz2
+sha256  b327887de263238deaa80c34cdd2ff3e0ba1d35db585ce14a37ce3e74ee389e9  COPYING

package/dav1d/dav1d.mk

@@ -0,0 +1,31 @@
+################################################################################
+#
+# dav1d
+#
+################################################################################
+
+DAV1D_VERSION = 0.9.2
+DAV1D_SOURCE = dav1d-$(DAV1D_VERSION).tar.bz2
+DAV1D_SITE = https://code.videolan.org/videolan/dav1d/-/archive/$(DAV1D_VERSION)
+DAV1D_LICENSE = BSD-2-Clause
+DAV1D_LICENSE_FILES = COPYING
+DAV1D_INSTALL_STAGING = YES
+DAV1D_CONF_OPTS = \
+	-Denable_tests=false \
+	-Denable_tools=false
+
+ifeq ($(BR2_i386)$(BR2_x86_64),y)
+DAV1D_DEPENDENCIES += host-nasm
+endif
+
+# ARM assembly requires v6+ ISA
+ifeq ($(BR2_ARM_CPU_ARMV4)$(BR2_ARM_CPU_ARMV5)$(BR2_ARM_CPU_ARMV7M),y)
+DAV1D_CONF_OPTS += -Denable_asm=false
+endif
+
+# Uses __atomic_fetch_add_4
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+DAV1D_LDFLAGS += -latomic
+endif
+
+$(eval $(meson-package))