Update flash drivers to use DT_HAS_<compat>_ENABLED Kconfig symbol
to expose the driver and enable it by default based on devicetree.
We remove 'depend on' Kconfig for symbols that would be implied by
the devicetree node existing.
Signed-off-by: Kumar Gala <galak@kernel.org>
This includes a basic driver for built-in flash on the Texas Intruments
SimpleLink CC13xx/CC26xx SoC series.
The driver makes use of driverlib HAL from TI's SDK and was tested on
two LaunchXL development boards with CC1352R and CC2652R SoCs:
- CC1352R1 LaunchXL
- CC26x2R1 LaunchXL
Tests were done using:
- flash shell sample (samples/drivers/flash_shell)
- littlefs filesystem sample (samples/subsys/fs/littlefs)*
- MCUboot (bootloader/mcuboot/boot/zephyr)*
* additional changes in DTS for the boards were required (partitions
table) and are not part of this changeset (will be introduced later)
Some additional information about the implementation:
1. TI's Technical Reference Manual for CC13x2 and CC26x2 points out that
"An individual 64-bit word can be programmed to change bits 1 to 0"
but it seems this 'alignment' requirement is handled internally by
the ROM function and thus 'write-block-size' is set to 1.
2. Interrupts, VIMS and line buffers are disabled during flash content
update (write or erase) and restored afterwards as recommended by TI.
3. Only RAM to flash write is supported (source of data to be written to
flash can't point to flash).
4. The driver doesn't take care of flash sector protection disable as
that functionality is handled by CCFG. Write or erase requests which
refer to a protected area will fail.
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>
