This patch introduces the "led" shell command. This allows to run the
LED API functions (and to test the LED drivers) from the Zephyr shell.
The following subcommands are supported:
- on
- off
- get_info
- set_brightness
- set_color
- set_channel
- write_channels
Signed-off-by: Simon Guinot <simon.guinot@seagate.com>