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.
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
v3->v4:
* move into Documentation/devicetree/bindings/mailbox/fsl,mu.txt
v2->v3:
* change to mailbox binding
Currently mbox-cells has to be 0 for SCU MU.
Generic MU Mailbox support binding could be extended later.
v1->v2:
* typo fixes
* remove status property
* remove imx6&7 compatible string which may be added later for
the generic mailbox binding
---
.../devicetree/bindings/mailbox/fsl,mu.txt | 34 ++++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/fsl,mu.txt
diff --git a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
new file mode 100644
index 0000000..90e4905
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
@@ -0,0 +1,34 @@
+NXP i.MX Messaging Unit (MU)
+--------------------------------------------------------------------
+
+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. The MU also provides the ability
+for one processor to signal the other processor using interrupts.
+
+Because the MU manages the messaging between processors, the MU uses
+different clocks (from each side of the different peripheral buses).
+Therefore, the MU must synchronize the accesses from one side to the
+other. The MU accomplishes synchronization using two sets of matching
+registers (Processor A-facing, Processor B-facing).
+
+Messaging Unit Device Node:
+=============================
+
+Required properties:
+-------------------
+- compatible : should be "fsl,<chip>-mu", the supported chips include
+ imx8qxp, imx8qm.
+- reg : Should contain the registers location and length
+- interrupts : Interrupt number. The interrupt specifier format depends
+ on the interrupt controller parent.
+- #mbox-cells: Must be 0. Number of cells in a mailbox
+
+Examples:
+--------
+lsio_mu0: mailbox@5d1b0000 {
+ compatible = "fsl,imx8qxp-mu";
+ reg = <0x0 0x5d1b0000 0x0 0x10000>;
+ interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
+ #mbox-cells = <0>;
+};
--
2.7.4
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