SPI TFT ILI9488

Out Of Tree DRM Driver for ILI9488 Driver Chip Based TFT 3.5" 480x320 LCDs that utilize the SPI protocol.

NOTE: There is already a kernel driver that was being moved upstream by Kamlesh Gurudasani.

This is just my implementation.

Setup

$ export KSRC="/lib/modules/$(uname -r)/build"

Building

Compile Kernel Module

$ make -j $(nproc)

Compile DTS/ASL

# Compile Device Tree Source to Device Tree Blob
$ make dtb

# Compile ACPI Source Language to ACPI Machine Language
$ make aml

Testing AML file

# First Gather, Extract, & Disassemble ACPI Tables
$ acpidump > acpi.log
$ acpixtract acpi.log

# To get source of all DSDT/SSDT
$ iasl -d *.dat > /dev/null 2>&1

# Execute
$ acpiexec *.{dat,aml}

SSDT overlays: Run-time ConfigFS approach

# If desire alias for loading and unloading ACPI SSDT
$ source devutils/compile-load-alias

# Mount ConfigFS
$ mount -t configfs none /sys/kernel/config

# Load ACPI ConfigFS support (if it’s a module)
$ modprobe acpi-configfs

# Load SSDT
$ mkdir -p /sys/kernel/config/acpi/table/ili9488
$ cat "ili9488.aml" > "/sys/kernel/config/acpi/table/ili9488/aml"
# OR
$ load_ili9488_aml

# Unload SSDT
$ ./devutils/unload-acpi-table /sys/kernel/config/acpi/table/ili9488
# OR
$ unload_ili9488_aml