[PATCH v9 1/5] dt-bindings: remoteproc: k3-m4f: Add K3 AM64x SoCs

[Andrew Davis]

From: Hari Nagalla <hnagalla at ti.com>

K3 AM64x SoC has a Cortex M4F subsystem in the MCU voltage domain.
The remote processor's life cycle management and IPC mechanisms are
similar across the R5F and M4F cores from remote processor driver
point of view. However, there are subtle differences in image loading
and starting the M4F subsystems.

The YAML binding document provides the various node properties to be
configured by the consumers of the M4F subsystem.

Signed-off-by: Martyn Welch <martyn.welch at collabora.com>
Signed-off-by: Hari Nagalla <hnagalla at ti.com>
Signed-off-by: Andrew Davis <afd at ti.com>
Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
---
 .../bindings/remoteproc/ti,k3-m4f-rproc.yaml  | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
new file mode 100644
index 0000000000000..2bd0752b6ba9e
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
@@ -0,0 +1,125 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/remoteproc/ti,k3-m4f-rproc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI K3 M4F processor subsystems
+
+maintainers:
+  - Hari Nagalla <hnagalla at ti.com>
+  - Mathieu Poirier <mathieu.poirier at linaro.org>
+
+description: |
+  Some K3 family SoCs have Arm Cortex M4F cores. AM64x is a SoC in K3
+  family with a M4F core. Typically safety oriented applications may use
+  the M4F core in isolation without an IPC. Where as some industrial and
+  home automation applications, may use the M4F core as a remote processor
+  with IPC communications.
+
+$ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ti,am64-m4fss
+
+  power-domains:
+    maxItems: 1
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 2
+
+  reg:
+    items:
+      - description: IRAM internal memory region
+      - description: DRAM internal memory region
+
+  reg-names:
+    items:
+      - const: iram
+      - const: dram
+
+  resets:
+    maxItems: 1
+
+  firmware-name:
+    maxItems: 1
+    description: Name of firmware to load for the M4F core
+
+  mboxes:
+    description:
+      OMAP Mailbox specifier denoting the sub-mailbox, to be used for
+      communication with the remote processor. This property should match
+      with the sub-mailbox node used in the firmware image.
+    maxItems: 1
+
+  memory-region:
+    description:
+      phandle to the reserved memory nodes to be associated with the
+      remoteproc device. Optional memory regions available for firmware
+      specific purposes.
+      (see reserved-memory/reserved-memory.yaml in dtschema project)
+    maxItems: 8
+    items:
+      - description: regions used for DMA allocations like vrings, vring buffers
+                     and memory dedicated to firmware's specific purposes.
+    additionalItems: true
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - ti,sci
+  - ti,sci-dev-id
+  - ti,sci-proc-ids
+  - resets
+  - firmware-name
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mcu_m4fss_dma_memory_region: m4f-dma-memory at 9cb00000 {
+            compatible = "shared-dma-pool";
+            reg = <0x00 0x9cb00000 0x00 0x100000>;
+            no-map;
+        };
+
+        mcu_m4fss_memory_region: m4f-memory at 9cc00000 {
+            compatible = "shared-dma-pool";
+            reg = <0x00 0x9cc00000 0x00 0xe00000>;
+            no-map;
+        };
+    };
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mailbox0_cluster0: mailbox-0 {
+            #mbox-cells = <1>;
+        };
+
+        remoteproc at 5000000 {
+            compatible = "ti,am64-m4fss";
+            reg = <0x00 0x5000000 0x00 0x30000>,
+                  <0x00 0x5040000 0x00 0x10000>;
+            reg-names = "iram", "dram";
+            resets = <&k3_reset 9 1>;
+            firmware-name = "am62-mcu-m4f0_0-fw";
+            mboxes = <&mailbox0_cluster0>, <&mbox_m4_0>;
+            memory-region = <&mcu_m4fss_dma_memory_region>,
+                            <&mcu_m4fss_memory_region>;
+            ti,sci = <&dmsc>;
+            ti,sci-dev-id = <9>;
+            ti,sci-proc-ids = <0x18 0xff>;
+         };
+    };
-- 
2.39.2