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authorDuc Dang <dhdang@apm.com>2016-02-12 19:39:27 -0800
committerJassi Brar <jaswinder.singh@linaro.org>2016-02-15 13:20:04 +0530
commit9b2396dd1e41657c095d480802020c283ba1a43e (patch)
tree16a94f5807bf93dc42bb7a766369062db2f232af /Documentation/devicetree
parentf700e84f417b98f867c5db0555e6f01724d53cd2 (diff)
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Documentation: mailbox: Add APM X-Gene SLIMpro mailbox dts documentation
This adds the APM X-Gene SLIMpro mailbox device tree node documentation. Signed-off-by: Feng Kan <fkan@apm.com> Signed-off-by: Duc Dang <dhdang@apm.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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+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 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: Contains the mailbox register address range.
+
+- interrupts: 8 interrupts must be from 0 to 7, 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:
+ mailbox: mailbox@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>,
+ };
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