[PATCH RFC v6 1/9] dt-bindings: interconnect: Add bindings for imx8m noc

[Leonard Crestez <leonard.crestez@nxp.com>]

Add initial dt bindings for the interconnects inside i.MX chips.
Multiple external IPs are involved but SOC integration means the
software controllable interfaces are very similar.

Main NOC node acts as interconnect provider if #interconnect-cells is
present.

Multiple interconnects can be present, each with their own OPP table.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
 .../bindings/interconnect/fsl,imx8m-noc.yaml  | 104 ++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interconnect/fsl,imx8m-noc.yaml

diff --git a/Documentation/devicetree/bindings/interconnect/fsl,imx8m-noc.yaml b/Documentation/devicetree/bindings/interconnect/fsl,imx8m-noc.yaml
new file mode 100644
index 000000000000..5cd94185fec3
--- /dev/null
+++ b/Documentation/devicetree/bindings/interconnect/fsl,imx8m-noc.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interconnect/fsl,imx8m-noc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic i.MX bus frequency device
+
+maintainers:
+  - Leonard Crestez <leonard.crestez@nxp.com>
+
+description: |
+  The i.MX SoC family has multiple buses for which clock frequency (and
+  sometimes voltage) can be adjusted.
+
+  Some of those buses expose register areas mentioned in the memory maps as GPV
+  ("Global Programmers View") but not all. Access to this area might be denied
+  for normal (non-secure) world.
+
+  The buses are based on externally licensed IPs such as ARM NIC-301 and
+  Arteris FlexNOC but DT bindings are specific to the integration of these bus
+  interconnect IPs into imx SOCs.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+        - enum:
+          - fsl,imx8mn-nic
+          - fsl,imx8mm-nic
+          - fsl,imx8mq-nic
+        - const: fsl,imx8m-nic
+      - items:
+        - enum:
+          - fsl,imx8mn-noc
+          - fsl,imx8mm-noc
+          - fsl,imx8mq-noc
+        - const: fsl,imx8m-noc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  operating-points-v2: true
+  opp-table: true
+
+  devfreq:
+    $ref: "/schemas/types.yaml#/definitions/phandle"
+    description:
+      Phandle to another devfreq device to match OPPs with by using the
+      passive governor.
+
+  '#interconnect-cells':
+    description:
+      If specified then also act as an interconnect provider. Should only be
+      set once per soc on main noc.
+    const: 1
+
+  fsl,scalable-node-ids:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Array of node ids for scalable nodes. Uses same numeric identifier
+      namespace as the consumer "interconnects" binding.
+
+  fsl,scalable-nodes:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Array of phandles to scalable nodes. Must be of same length as
+      fsl,scalable-node-ids.
+
+required:
+  - compatible
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8mq-clock.h>
+    #include <dt-bindings/interconnect/imx8mq.h>
+    noc: interconnect@32700000 {
+            compatible = "fsl,imx8mq-noc", "fsl,imx8m-noc";
+            reg = <0x32700000 0x100000>;
+            clocks = <&clk IMX8MQ_CLK_NOC>;
+            #interconnect-cells = <1>;
+            fsl,scalable-node-ids = <IMX8MQ_ICN_NOC>,
+                                    <IMX8MQ_ICS_DRAM>;
+            fsl,scalable-nodes = <&noc>,
+                                 <&ddrc>;
+            operating-points-v2 = <&noc_opp_table>;
+
+            noc_opp_table: opp-table {
+                    compatible = "operating-points-v2";
+
+                    opp-133M {
+                            opp-hz = /bits/ 64 <133333333>;
+                    };
+                    opp-800M {
+                            opp-hz = /bits/ 64 <800000000>;
+                    };
+            };
+    };
-- 
2.17.1