[PATCH v2 09/14] dt-binding: remoteproc: Add binding doc for PRU Cores in the PRU-ICSS

[Roger Quadros <rogerq@ti.com>]

From: Suman Anna <s-anna@ti.com>

The Programmable Real-Time Unit Subsystem (PRUSS) consists of
dual 32-bit RISC cores (Programmable Real-Time Units, or PRUs)
for program execution. This patch adds a remoteproc platform
driver for managing the individual PRU RISC cores life cycle.

Add DT binding documentation for that.

Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 .../bindings/remoteproc/ti,pru-rproc.txt           | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.txt

diff --git a/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.txt b/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.txt
new file mode 100644
index 0000000..02dfd0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.txt
@@ -0,0 +1,56 @@
+PRU Core on TI SoCs
+===================
+
+Each PRUSS has dual PRU cores, each represented by a PRU child node. Each node
+can optionally be rendered inactive by using the standard DT string property,
+"status".
+
+Required Properties:
+--------------------
+- compatible     : should be
+                       "ti,am3356-pru" for AM335x family of SoCs
+                       "ti,am4376-pru" for AM437x family of SoCs
+                       "ti,am5728-pru" for AM57xx family of SoCs
+                       "ti,k2g-pru" for 66AK2G family of SoCs
+- reg            : base address and size for each of the 3 sub-module address
+                   spaces as mentioned in reg-names, and in the same order as
+                   the reg-names
+- reg-names      : should contain each of the following 3 names, the binding is
+                   agnostic of the order of these reg-names
+                       "iram" for Instruction RAM,
+                       "control" for the CTRL sub-module registers,
+                       "debug" for the Debug sub-module registers,
+
+- firmware-name  : should contain the name of the firmware image file
+		   located on the firmware search path. This firmware will be
+		   used as default if the Application node or User (via sysfs)
+		   doesn't provide a firmware-name.
+
+- gpcfg		 : pHandle to CFG module's syscon regmap and offset to PRU's
+		   GPCFG register.
+
+Optional Properties:
+--------------------
+The virtio based communication between the MPU and a PRU core _requires_
+either the 'mboxes' property, or the set of 'interrupt-parent', 'interrupts'
+and 'interrupt-names' properties to be defined. The latter option is the
+preferred choice. The 'mboxes' property is not applicable for 66AK2G and
+DA850/OMAP-L138 SoCs.
+
+- mboxes           : OMAP Mailbox specifier denoting the sub-mailbox, if using
+                     a mailbox for IPC signalling between host and a PRU core.
+                     The specifier format is as per the bindings,
+                         Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
+                     This property should match with the sub-mailbox node used
+                     in the corresponding firmware image.
+- interrupt-parent : phandle to the PRUSS INTC node. Should be defined if
+                     interrupts property is to be used.
+- interrupts       : array of interrupt specifiers if using PRU system events
+                     for IPC signalling between host and a PRU core. This
+                     property should match with the PRU system event used in
+                     the corresponding firmware image.
+- interrupt-names  : should use one of the following names for each interrupt,
+                     the name should match the corresponding PRU system event
+                     number,
+                         "vring" - for PRU to HOST virtqueue signalling
+                         "kick"  - for HOST to PRU virtqueue signalling
-- 
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