drivers: change old license headers to SPDX format

[N11cc00]

Contribution description

This draft attempts to convert all license headers for all files inside the drivers/ directory. Vendor specific files are left untouched as well as some files missing some copyright or license information.

At the moment, only *.c and *.h files are touched but other files like .Kconfig also posses copyright information. These need to be changed, too, before this PR can be merged.

The LICENSE file had to be moved to the LICENSE/ sub-directory and was renamed to the exact license name so that SPDX parsers can pick it up.

I have manually edited a handful of files but there are still some left to fix. See below.

Testing procedure

To check for correct license/copyright information in all c and h files that are not vendor provided, use this command:

reuse lint -l | grep "^drivers/" | grep -E '\.(c|h):' | grep -v "/vendor/"

this produces the following lines:

drivers/lis2dh12/include/lis2dh12_registers.h: bad license NONE
drivers/lis2dh12/include/lis2dh12_registers.h: missing license NONE
drivers/include/stm32_eth.h: no license identifier
drivers/mrf24j40/mrf24j40_radio_hal.c: no license identifier
drivers/kw41zrf/kw41zrf_xcvr.c: no license identifier
drivers/kw2xrf/include/overwrites.h: no license identifier
drivers/kw2xrf/include/kw2xrf_reg.h: no license identifier
drivers/sht2x/include/sht2x_params.h: no license identifier
drivers/include/stm32_eth.h: no copyright notice
drivers/mrf24j40/mrf24j40_radio_hal.c: no copyright notice

Some of these have either other licenses provided by companies or are simply missing some information.

• lis2dh12_registers.h had no license, only copyright. I set the license to NONE for the time being.
• stm32_eth.h and mrf24j40_radio_hal.c have no header at all.
• overwrites.h has its own copyright information by Freescale Semiconductor, Inc.
• kw41zrf_xcvr.c has a BSD license
• kw2xrf_reg.h has a mixed license LGPL and Freescale Semiconductor, Inc.

Issues/PRs references

Tracking #21515

[riot-ci]

Murdock results

✔️ PASSED

798c242 drivers: bulk of files changed to SPDX format

Success	Failures	Total	Runtime
10514	0	10516	10m:39s

Artifacts

• Documentation preview