From: Tero Kristo <t-kristo@xxxxxx>
Add documentation for the Texas Instruments PRU application nodes.
These are used to configure specific user applications for PRU instances.
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
[s-anna@xxxxxx: some binding updates]
Signed-off-by: Suman Anna <s-anna@xxxxxx>
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
.../devicetree/bindings/soc/ti/ti,pruss.txt | 43 ++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt b/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
index 3e5f32f..94c91ee 100644
--- a/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
+++ b/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
@@ -210,6 +210,38 @@ used in TI Davinci SoCs. Please refer to the corresponding binding document,
Documentation/devicetree/bindings/net/davinci-mdio.txt for details.
+Application/User Nodes
+=======================
+A PRU application/user node typically uses one or more PRU device nodes to
+implement a PRU application/functionality. Each application/client node would
+need a reference to at least a PRU node, and optionally pass some configuration
+parameters.
+
+Required Properties:
+--------------------
+- prus : phandles to the PRU nodes used
+
+Optional Properties:
+--------------------
+- firmware-name : firmwares for the PRU cores, the default firmware
+ for the core from the PRU node will be used if not
+ provided. The firmware names should correspond to
+ the PRU cores listed in the 'prus' property
+- ti,pruss-gp-mux-sel : array of values for the GP_MUX_SEL under PRUSS_GPCFG
+ register for a PRU. This selects the internal muxing
+ scheme for the PRU instance. If not provided, the
+ default out-of-reset value (0) for the PRU core is
+ used. Values should correspond to the PRU cores listed
+ in the 'prus' property
+- ti,pru-interrupt-map : PRU interrupt mappings, containing an array of entries
+ with each entry consisting of 4 cell-values. First one
+ is an index towards the "prus" property to identify the
+ PRU core for the interrupt map, second is the PRU
+ System Event id, third is the PRU interrupt channel id
+ and fourth is the PRU host interrupt id. If provided,
+ this map will supercede any other configuration
+ provided through firmware
+
Example:
========
1. /* AM33xx PRU-ICSS */
@@ -397,3 +429,14 @@ Example:
...
};
};
+
+3: /* PRU application node example */
+ app_node: app_node {
+ prus = <&pru1_0>, <&pru1_1>;
+ firmware-name = "pruss-app-fw", "pruss-app-fw-2";
+ ti,pruss-gp-mux-sel = <2>, <1>;
+ /* setup interrupts for prus:
+ prus[0] => pru1_0: ev=16, chnl=2, host-irq=7,
+ prus[1] => pru1_1: ev=19, chnl=1, host-irq=3 */
+ ti,pru-interrupt-map = <0 16 2 7 >, <1 19 1 3>;
+ }
--
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