[PATCH 1/4] dt-bindings: clock: document the fsl-flexspi-clk driver

[Michael Walle]

Hi,

Sorry, I've forgot the cover letter. Next version will have one.

On Layerscape SoCs which feature the FlexSPI controller there is
a single register which can control the divider value. The base
frequency is the platform PLL.

Right now the LS1028A and the LX2160A aren't able to switch the
SCK frequency on the FlexSPI interface. Add a new clock driver
which operate on said register.

-michael