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 | 41 ++++++++++++++++++++++
1 file changed, 41 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..d0b74fb
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+The APM X-Gene SLIMpro mailbox driver 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 8 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: Contain interrupt information for the mailbox device.
+
+- #mbox-cells: Specify the number of parameters used by the mailbox client.
+ Currently 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>,
+ <0x0 0x7 0x4>;
+ };
+
+Client Node:
+ i2c-slimpro {
+ compatible = "apm,xgene-slimpro-i2c";
+ mbox = <&slimpro-mbox 0>;
+ mbox-names = "i2c-slimpro";
+ };
--
1.9.1
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