Add the device tree bindings document for ti,am3353-wkup-m3-ipc which
is used by the wkup_m3_ipc driver.
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
---
.../devicetree/bindings/soc/ti/wkup_m3_ipc.txt | 41 ++++++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
diff --git a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
new file mode 100644
index 0000000..ceb6acf
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
@@ -0,0 +1,41 @@
+Wakeup M3 IPC Driver
+=====================
+
+TI AMx3 family of devices use a Cortex M3 co-processor to help with various
+low power tasks that cannot be controlled from the MPU like suspend/resume
+and certain deep C-states for CPU Idle. Once the wkup_m3_ipc driver uses the
+wkup_m3_rproc driver to boot the wkup_m3, it handles communication with the
+CM3 using IPC registers present in the SoC's control module and a mailbox.
+The wkup_m3_ipc exposes an API to allow the SoC PM code to execute specific
+PM tasks.
+
+Wkup M3 Device Node:
+====================
+A wkup_m3_ipc device node is used to represent a wakeup M3 IP instance within
+an SoC. The sub-mailboxes are represented as child node of this parent node.
+
+Required properties:
+--------------------
+- compatible: Should be "ti,am3353-wkup-m3-ipc" for AM33xx SoCs
+- reg: Contains the wkup_m3 register address ranges for
+ ipc-regs.
+- reg-names: Name for ipc-regs given above
+- interrupts: Contains the interrupt information for the wkup_m3
+ interrupt that signals the MPU.
+- ti,rproc: Phandle to the wkup_m3 rproc node so the IPC driver
+ can boot it.
+- mboxes: Phandles used by IPC framework to get correct mbox
+ channel for communication. Must point to appropriate
+ mbox_wkupm3 child node.
+
+Example:
+--------
+/* AM33xx */
+wkup_m3_ipc: wkup_m3_ipc@44e11324 {
+ compatible = "ti,am3353-wkup-m3-ipc";
+ reg = <0x44e11324 0x0024>;
+ reg-names = "ipc_regs";
+ interrupts = <78>;
+ ti,rproc = <&wkup_m3>;
+ mboxes = <&mailbox &mbox_wkupm3>;
+};
--
2.1.0
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