add rpi kernel

Makefile

@@ -1,11 +1,11 @@
 project_name = kaibutsu
 
-.PHONY: usage mt8183 mt8192 sc7180 stoneyridge chromebook
+.PHONY: usage mt8183 mt8192 sc7180 stoneyridge chromebook rpi
 
 usage:
 	@echo "usage: make [kernel_variant|all]"
 
-all: mt8183 mt8192 sc7180
+all: mt8183 mt8192 sc7180 stoneyridge chromebook rpi
 
 mt8183:
 	make -C mt8183 build
@@ -21,3 +21,6 @@ stoneyridge:
 
 chromebook:
 	make -C chromebook build
+
+rpi:
+	make -C rpi build

rpi/Makefile

@@ -0,0 +1,26 @@
+REF=$(shell cat ref)
+
+ifeq ($(shell uname -m), x86_64)
+        CROSS=aarch64-linux-gnu-
+endif
+
+setup:
+	rm -rf ../linux/*.patch
+	cp *.patch ../linux
+	cp config ../linux/.config
+	cd ../linux; \
+	git reset --hard; \
+	git clean -df; \
+	git remote remove rpi; \
+	git remote add rpi https://github.com/raspberrypi/linux.git; \
+	git fetch rpi refs/heads/$(REF):refs/heads/$(REF); \
+	git checkout $(REF); \
+	for patch in $$(ls *.patch); do patch -p1 < "$$patch"; done; \
+  git -c commit.gpgsign=false commit -a -m 'removing -dirty suffix after patches'
+
+compile:
+	ARCH=arm64 CROSS_COMPILE=$(CROSS) make -C ../linux olddefconfig rpm-pkg -j$(shell nproc)
+	cp -r ../linux/rpmbuild .
+	rm -rf ../linux/rpmbuild
+
+build: setup compile