On Mon, Jul 16, 2018 at 01:42:07PM +0200, Oleksij Rempel wrote:

The Messaging Unit module enables two processors within
the SoC to communicate and coordinate by passing messages
(e.g. data, status and control) through the MU interface.

v3? I already gave my R-by on v4 from Dong. Please coordinate your work 
on this.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
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 .../devicetree/bindings/mailbox/fsl,mu.txt    | 32 +++++++++++++++++++
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 create mode 100644 Documentation/devicetree/bindings/mailbox/fsl,mu.txt