[PATCH v3 0/8] Add the Quadspi driver for vf610-twr

[Ricard Wanderlof]

On Thu, 12 Sep 2013, Russell King - ARM Linux wrote:

> On Thu, Sep 12, 2013 at 12:48:31PM +0100, Mark Brown wrote:
>> On Thu, Sep 12, 2013 at 12:17:45PM +0100, David Woodhouse wrote:
>>
>>> Right. The issue here is that the LUT is currently *pre-populated*, with
>>> an incestuously-"known" set of commands that the slave is expected to
>>> support.
>>
>> So, to repeat my earlier question can someone tell me what a LUT is?
>
> It's a very common abbreviation - Look Up Table.
>
> More specifically, it's a set of registers which give the SPI controller
> a sequence of 16-bit commands to execute, which tell it what to do on
> the SPI bus.  Each register contains two commands, and it executes them
> ...

A bit of an odd name when used in this context I think; LUTs are usually 
used to perform mapping or transformation functions, e.g. looking up a 
value 'y' given an input value 'x'. In this case it's just a table of 
commands to be executed. But I guess the name LUT has been used in some 
hardware specification so there's not much we can do about it.

/Ricard
-- 
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
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