From mboxrd@z Thu Jan  1 00:00:00 1970
From: Timur Tabi <timur@tabi.org>
Subject: Re: [PATCH 1/1] serial/uuc_uart: Set shutdown timeout to CONFIG_HZ
 independent 2ms
Date: Tue, 6 Dec 2016 07:35:43 -0600
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To: Alexander Stein <alexander.stein@systec-electronic.com>
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Alexander Stein wrote:
> Okay, I was just wondering why the timeout is dependant on the timer tick.
> That didn't seem obvious to me.
> Rethinking about this, I would rather replace those lines with msleep instead.

What's wrong with leaving it as-is?  The code is five years old, and 
Freescale/NXP barely uses the QE any more.  I don't have access to any 
hardware to test any changes you would propose.