linux-kernel - [PATCH 1/2] Documentation: dt: mailbox: Add TI Message Manager

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Message-ID: <1454690044-2560-2-git-send-email-nm@ti.com>
Date:	Fri, 5 Feb 2016 10:34:03 -0600
From:	Nishanth Menon <nm@...com>
To:	Jassi Brar <jassisinghbrar@...il.com>, Suman Anna <s-anna@...com>
CC:	Franklin S Cooper Jr <fcooper@...com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Nishanth Menon <nm@...com>
Subject: [PATCH 1/2] 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@...com>
---
 .../bindings/mailbox/ti,message-manager.txt        | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/ti,message-manager.txt

diff --git a/Documentation/devicetree/bindings/mailbox/ti,message-manager.txt b/Documentation/devicetree/bindings/mailbox/ti,message-manager.txt
new file mode 100644
index 000000000000..f3d73b0b3c66
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/ti,message-manager.txt
@@ -0,0 +1,72 @@
+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"
+				"ti,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 1
+
+Child Nodes:
+============
+A child node is used for representing the actual queue device that is
+used for the communication between the host processor and a remote processor.
+Each child node should have a unique node name across all the different
+message manager device nodes.
+
+Required Properties:
+--------------------
+- ti,queue-id:		Indicates the queue number this node represents
+- ti,proxy-id:		Proxy ID representing the processor in the SoC.
+
+Optional Properties:
+--------------------
+- interrupt-names:	'rx' - indicates a receive interrupt (mandatory ONLY if
+			this is a receive queue)
+- interrupts:		Contains the interrupt information corresponding to
+			interrupt-names property.
+
+Example:
+--------
+
+	msgmgr: msgmgr@...00000 {
+		compatible = "ti,k2g-message-manager", "ti,message-manager";
+		#mbox-cells = <1>;
+		reg-names = "queue_proxy_region", "queue_state_debug_region";
+		reg = <0x02a00000 0x400000>, <0x028c3400 0x400>;
+
+		msgmgr_proxy_pmmc_tx_prio0: pmmc_tx_prio0 {
+			ti,queue-id = <0>;
+			ti,proxy-id = <0>;
+		};
+
+		msgmgr_proxy_pmmc_rx: pmmc_rx {
+			ti,queue-id = <5>;
+			ti,proxy-id = <2>;
+			interrupt-names = "rx";
+			interrupts = <GIC_SPI 324 IRQ_TYPE_EDGE_RISING>;
+		};
+	};
+
+...
+	pmmc {
+		...
+		mbox-names = "tx", "rx";
+		mboxes = <&msgmgr &msgmgr_proxy_pmmc_tx>
+			 <&msgmgr &msgmgr_proxy_pmmc_rx>;
+		...
+	};
-- 
2.7.0