rock-pi-4: Split our variant machines

Splits out the three variants of the rock-pi-4 (A, B & C) into their own
machines. Unfortunately, it is not possible to have a single machine
that works for all three, as there isn't any known ways for the
bootloader to distinguish them. The old rock-pi-4 machine is kept around
for use with older kernels

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>

conf/machine/include/rk3399.inc

@@ -5,8 +5,8 @@ SOC_FAMILY = "rk3399"
 
 DEFAULTTUNE ?= "cortexa72-cortexa53-crypto"
 
-require conf/machine/include/tune-cortexa72-cortexa53.inc
 require conf/machine/include/soc-family.inc
+require conf/machine/include/tune-cortexa72-cortexa53.inc
 require conf/machine/include/rockchip-defaults.inc
 
 KBUILD_DEFCONFIG ?= "defconfig"

conf/machine/include/rock-pi-4.inc

@@ -0,0 +1,22 @@
+# Add a common override for all Rock Pi 4 machines
+MACHINEOVERRIDES =. "rock-pi-4:"
+
+require conf/machine/include/rk3399.inc
+
+RK_BOOT_DEVICE = "mmcblk1"
+WKS_FILE ?= "rock-pi-4.wks"
+IMAGE_FSTYPES += "wic wic.bmap"
+
+WKS_FILE_DEPENDS ?= " \
+    mtools-native \
+    dosfstools-native \
+    virtual/bootloader \
+    virtual/kernel \
+    "
+IMAGE_BOOT_FILES ?= "\
+    ${KERNEL_IMAGETYPE} \
+    "
+
+SERIAL_CONSOLES = "1500000;ttyS2"
+
+MACHINE_EXTRA_RRECOMMENDS += "kernel-modules"

conf/machine/rock-pi-4.conf

@@ -4,26 +4,12 @@
 #@TYPE: Machine
 #@NAME: Rock Pi 4 RK3399
 #@DESCRIPTION: Rock Pi 4 is a Raspberry Pi 4 Alternative based on Rockchip RK3399 Processor.
+#
+# NOTE: This machine is for Kernels before 5.10. If you are using an newer kernel
+# see rock-pi-4{a,b,c}.conf
 
-require conf/machine/include/rk3399.inc
+require conf/machine/include/rock-pi-4.inc
 
 KERNEL_DEVICETREE = "rockchip/rk3399-rock-pi-4.dtb"
 UBOOT_MACHINE = "rock-pi-4-rk3399_defconfig"
 
-RK_BOOT_DEVICE = "mmcblk1"
-WKS_FILE ?= "rock-pi-4.wks"
-IMAGE_FSTYPES += "wic wic.bmap"
-
-WKS_FILE_DEPENDS ?= " \
-    mtools-native \
-    dosfstools-native \
-    virtual/bootloader \
-    virtual/kernel \
-    "
-IMAGE_BOOT_FILES ?= "\
-    ${KERNEL_IMAGETYPE} \
-    "
-
-SERIAL_CONSOLES = "1500000;ttyS2"
-
-MACHINE_EXTRA_RRECOMMENDS += "kernel-modules"

conf/machine/rock-pi-4a.conf

@@ -0,0 +1,11 @@
+#@TYPE: Machine
+#@NAME: Rock Pi 4A RK3399
+#@DESCRIPTION: Rock Pi 4 is a Raspberry Pi 4 Alternative based on Rockchip RK3399 Processor.
+#
+# NOTE: This machine is for Kernel 5.10 and later. If you are using an older
+# kernel, see rock-pi-4.conf
+
+require conf/machine/include/rock-pi-4.inc
+
+KERNEL_DEVICETREE = "rockchip/rk3399-rock-pi-4a.dtb"
+UBOOT_MACHINE = "rock-pi-4-rk3399_defconfig"

conf/machine/rock-pi-4b.conf

@@ -0,0 +1,11 @@
+#@TYPE: Machine
+#@NAME: Rock Pi 4B RK3399
+#@DESCRIPTION: Rock Pi 4 is a Raspberry Pi 4 Alternative based on Rockchip RK3399 Processor.
+#
+# NOTE: This machine is for Kernel 5.10 and later. If you are using an older
+# kernel, see rock-pi-4.conf
+
+require conf/machine/include/rock-pi-4.inc
+
+KERNEL_DEVICETREE = "rockchip/rk3399-rock-pi-4b.dtb"
+UBOOT_MACHINE = "rock-pi-4-rk3399_defconfig"

conf/machine/rock-pi-4c.conf

@@ -0,0 +1,11 @@
+#@TYPE: Machine
+#@NAME: Rock Pi 4C RK3399
+#@DESCRIPTION: Rock Pi 4 is a Raspberry Pi 4 Alternative based on Rockchip RK3399 Processor.
+#
+# NOTE: This machine is for Kernel 5.10 and later. If you are using an older
+# kernel, see rock-pi-4.conf
+
+require conf/machine/include/rock-pi-4.inc
+
+KERNEL_DEVICETREE = "rockchip/rk3399-rock-pi-4c.dtb"
+UBOOT_MACHINE = "rock-pi-4c-rk3399_defconfig"