tree a98402bf2e373f1dfe7895c4dca31c90d32ad755
parent 29d63a59eaf1c9f3b37e249cda2a97e5e4f183f8
author mario.six@gdsys.cc <mario.six@gdsys.cc> 1468938013 +0200
committer Tom Rini <trini@konsulko.com> 1469462405 -0400

cmd: misc: Add support for fractions in sleep

A feasible way to communicate certain errors for devices that have no
other way of signalling besides LEDs is to flash these LEDs. For errors
in U-Boot, a script that utilizes the led and sleep commands would be a
practicable way, but currently the sleep command can only delay for an
integral amount of seconds, which is too slow to create an easily
noticeable pattern for flashing LEDs.

Therefore, this patch adds support for fractions (down to .001 seconds)
to the sleep command.

The parsing is kept minimal, simplistic and as robust as possible: After
converting the passed string using simple_strtoul and multiplying it
with 1000, we search for the first dot, convert the three characters
after that into a number (if they are not numbers, we ignore the
fractional part and just use the delay we got from simple_strtoul), and
add this number to the delay.

Signed-off-by: Mario Six <mario.six@gdsys.cc>