This adds the APM X-Gene SLIMpro mailbox device tree node documentation.
Signed-off-by: Feng Kan <fkan@xxxxxxx>
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.../bindings/mailbox/xgene-slimpro-mailbox.txt | 34 ++++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/xgene-slimpro-mailbox.txt
diff --git a/Documentation/devicetree/bindings/mailbox/xgene-slimpro-mailbox.txt b/Documentation/devicetree/bindings/mailbox/xgene-slimpro-mailbox.txt
new file mode 100644
index 0000000..d02a3d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/xgene-slimpro-mailbox.txt
@@ -0,0 +1,34 @@
+The APM X-Gene SLIMpro mailbox is used to communicate messages between
+the ARM64 processors and the Cortex M3 (dubbed SLIMpro). It uses a simple
+interrupt based door bell mechanism and can exchange simple messages using the
+internal registers.
+
+There are total of 7 interrupts in this mailbox. Each used for an individual
+door bell (or mailbox channel).
+
+Required properties:
+- compatible: Should be as "apm, xgene-slimpro-mbox".
+
+- reg: Contain the mailbox register address range.
+
+- interrupts: 7 interrupts must start from 0 to 6, interrupt 0 define the
+ the interrupt for mailbox channel 0 and interrupt 1 for
+ mailbox channel 1 and so likewise for the reminder.
+
+- #mbox-cells: only one to specify the mailbox channel number.
+
+Example:
+
+Mailbox Node:
+ slimpro-mbox: slimpro-mbox@10540000 {
+ compatible = "apm,xgene-slimpro-mbox";
+ reg = <0x0 0x10540000 0x0 0xa000>;
+ #mbox-cells = <1>;
+ interrupts = <0x0 0x0 0x4>,
+ <0x0 0x1 0x4>,
+ <0x0 0x2 0x4>,
+ <0x0 0x3 0x4>,
+ <0x0 0x4 0x4>,
+ <0x0 0x5 0x4>,
+ <0x0 0x6 0x4>,
+ };
--
1.9.1
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