[PATCH v22 4/5] dt-bindings: remoteproc: Add documentation for ZynqMP R5 rproc bindings

[Ben Levinsky <ben.levinsky@xilinx.com>]

Add binding for ZynqMP R5 OpenAMP.

Represent the RPU domain resources in one device node. Each RPU
processor is a subnode of the top RPU domain node.

Signed-off-by: Jason Wu <j.wu@xilinx.com>
Signed-off-by: Wendy Liang <jliang@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
---
 .../xilinx,zynqmp-r5-remoteproc.yaml          | 143 ++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/xilinx,zynqmp-r5-remoteproc.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/xilinx,zynqmp-r5-remoteproc.yaml b/Documentation/devicetree/bindings/remoteproc/xilinx,zynqmp-r5-remoteproc.yaml
new file mode 100644
index 000000000000..9cb358389cd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/xilinx,zynqmp-r5-remoteproc.yaml
@@ -0,0 +1,143 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/remoteproc/xilinx,zynqmp-r5-remoteproc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Xilinx R5 remote processor controller bindings
+
+description:
+  This document defines the binding for the remoteproc component that loads and
+  boots firmwares on the Xilinx Zynqmp and Versal family chipset.
+
+  Note that the Linux has global addressing view of the R5-related memory (TCM)
+  so the absolute address ranges are provided in TCM reg's.
+
+maintainers:
+  - Ed Mooring <ed.mooring@xilinx.com>
+  - Ben Levinsky <ben.levinsky@xilinx.com>
+
+properties:
+  compatible:
+    const: xlnx,zynqmp-r5-remoteproc
+
+  lockstep-mode:
+    description:
+      If this property is present, then the configuration is lock-step.
+      Otherwise RPU is split.
+    type: boolean
+    maxItems: 1
+
+  interrupts:
+    description:
+      Interrupt mapping for remoteproc IPI. It is required if the
+      user uses the remoteproc driver with the RPMsg kernel driver.
+    maxItems: 6
+
+  memory-regions:
+    description:
+      Collection of memory carveouts used for elf-loading and inter-processor
+      communication. each carveout in this case should be in DDR, not
+      chip-specific memory. In Xilinx case, this is TCM, OCM, BRAM, etc.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
+  meta-memory-regions:
+    description:
+      Collection of memories that are not present in the top level memory
+      nodes' mapping. For example, R5s' TCM banks. These banks are needed
+      for R5 firmware meta data such as the R5 firmware's heap and stack.
+      To be more precise, this is on-chip reserved SRAM regions, e.g. TCM,
+      BRAM, OCM, etc.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
+  pnode-id:
+    maxItems: 1
+    description:
+      Power node id that is used to uniquely identify the node for Xilinx
+      Power Management. The value is then passed to Xilinx platform
+      manager for power on/off and access.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  mboxes:
+    description:
+      Array of phandles that describe the rx and tx for xilinx zynqmp
+      mailbox driver. order of rx and tx is described by the mbox-names
+      property. This will be used for communication with remote
+      processor.
+    maxItems: 2
+
+  mbox-names:
+    description:
+      Array of strings that denote which item in the mboxes property array
+      are the rx and tx for xilinx zynqmp mailbox driver
+    maxItems: 2
+    $ref: /schemas/types.yaml#/definitions/string-array
+
+
+examples:
+  - |
+     reserved-memory {
+          #address-cells = <1>;
+          #size-cells = <1>;
+          ranges;
+          elf_load: rproc@3ed000000 {
+               no-map;
+               reg = <0x3ed00000 0x40000>;
+          };
+
+          rpu0vdev0vring0: rpu0vdev0vring0@3ed40000 {
+               no-map;
+               reg = <0x3ed40000 0x4000>;
+          };
+          rpu0vdev0vring1: rpu0vdev0vring1@3ed44000 {
+               no-map;
+               reg = <0x3ed44000 0x4000>;
+          };
+          rpu0vdev0buffer: rpu0vdev0buffer@3ed48000 {
+               no-map;
+               reg = <0x3ed48000 0x100000>;
+          };
+
+     };
+
+     /*
+      * Below nodes are required if using TCM to load R5 firmware
+      * if not, then either do not provide nodes or label as disabled in
+      * status property
+      */
+     tcm0a: tcm_0a@ffe00000 {
+         reg = <0xffe00000 0x10000>;
+         pnode-id = <0xf>;
+         no-map;
+         status = "okay";
+         phandle = <0x40>;
+     };
+     tcm0b: tcm_1a@ffe20000 {
+         reg = <0xffe20000 0x10000>;
+         pnode-id = <0x10>;
+         no-map;
+         status = "okay";
+         phandle = <0x41>;
+     };
+
+     rpu {
+          compatible = "xlnx,zynqmp-r5-remoteproc";
+          #address-cells = <1>;
+          #size-cells = <1>;
+          ranges;
+          lockstep-mode;
+          r5_0 {
+               compatible = "xlnx,zynqmp-r5-single-remoteproc";
+               ranges;
+               #address-cells = <1>;
+               #size-cells = <1>;
+               memory-regions = <&elf_load>,
+                               <&rpu0vdev0vring0>,
+                               <&rpu0vdev0vring1>,
+                               <&rpu0vdev0buffer>;
+               meta-memory-regions = <&tcm_0a>, <&tcm_0b>;
+               pnode-id = <0x7>;
+          };
+     };
+
+...
-- 
2.17.1