#Letter#
#Step 3#
#Pin muxing
control#
#GPIO#
#Clocks#
#drivers/pinctrl/#
#drivers/clk/#
#drivers/gpio/#
#Step 1#
#Step 2#
#Device Tree
(SoC and board)#
#Timer
driver#
#IRQ controller
driver#
#Serial port
driver#
#arch/arm64/boot/dts/<vendors>/#
#drivers/clocksource/#
#drivers/irqchip/#
#drivers/tty/serial/#
#Network
driver#
#SPI
controller
driver#
#SATA
controller
driver#
#...
driver#
#drivers/ata/#
#drivers/net/#
#drivers/spi/#
#drivers/.../#
#SMP support#
#Power
management#