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Documentation: dt: mailbox: Add TI Message Manager 

Message Manager is a hardware block used to communicate with various
processor systems within certain Texas Instrument's Keystone
generation SoCs.

This hardware engine is used to transfer messages from various compute
entities(or processors) within the SoC. It is designed to be self
contained without needing software initialization for operation.

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Nishanth Menon 2016-03-16 19:23:13 -05:00 committed by Jassi Brar
parent c5a9d1f30c
commit 94b5293d55
1 changed files with 50 additions and 0 deletions
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Documentation/devicetree/bindings/mailbox/ti,message-manager.txt Normal file
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Texas Instruments' Message Manager Driver
========================================
The Texas Instruments' Message Manager is a mailbox controller that has
configurable queues selectable at SoC(System on Chip) integration. The Message
manager is broken up into queues in different address regions that are called
"proxies" - each instance is unidirectional and is instantiated at SoC
integration level to indicate receive or transmit path.
Message Manager Device Node:
===========================
Required properties:
--------------------
- compatible: Shall be: "ti,k2g-message-manager"
- reg-names queue_proxy_region - Map the queue proxy region.
queue_state_debug_region - Map the queue state debug
region.
- reg: Contains the register map per reg-names.
- #mbox-cells Shall be 2. Contains the queue ID and proxy ID in that
order referring to the transfer path.
- interrupt-names: Contains interrupt names matching the rx transfer path
for a given SoC. Receive interrupts shall be of the
format: "rx_<QID>_<PID>".
For ti,k2g-message-manager, this shall contain:
"rx_005_002", "rx_057_002"
- interrupts: Contains the interrupt information corresponding to
interrupt-names property.
Example(K2G):
------------
msgmgr: msgmgr@02a00000 {
compatible = "ti,k2g-message-manager";
#mbox-cells = <2>;
reg-names = "queue_proxy_region", "queue_state_debug_region";
reg = <0x02a00000 0x400000>, <0x028c3400 0x400>;
interrupt-names = "rx_005", "rx_057";
interrupts = <GIC_SPI 324 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 327 IRQ_TYPE_LEVEL_HIGH>;
};
pmmc: pmmc {
[...]
mbox-names = "rx", "tx";
# RX queue ID is 5, proxy ID is 2
# TX queue ID is 0, proxy ID is 0
mboxes= <&msgmgr 5 2>,
<&msgmgr 0 0>;
[...]
};