mailbox: Add support for i.MX messaging unit
The i.MX Messaging Unit is a two side block which allows applications implement communication over this sides. The MU includes the following features: - Messaging control by interrupts or by polling - Four general-purpose interrupt requests reflected to the other side - Three general-purpose flags reflected to the other side - Four receive registers with maskable interrupt - Four transmit registers with maskable interrupt Reviewed-by:Vladimir Zapolskiy <vz@mleia.com> Reviewed-by:
Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by:
Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by:
Jassi Brar <jaswinder.singh@linaro.org>
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