[PATCH 3/6] dt-bindings: soc: amlogic: document System Control registers

[Neil Armstrong]

Document the System Control registers regions found on all Amlogic
SoC families and it's clock, power, pinctrl and phy subnodes.

The regions has various independent registers tied to other
hardware devices, thus the syscon compatible.

Clock controllers and Pinctrl devices are not yet documented, the
definition of those will be updated in a second time.

Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>
---
 .../soc/amlogic/amlogic,meson-gx-hhi-sysctrl.yaml  | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/amlogic/amlogic,meson-gx-hhi-sysctrl.yaml b/Documentation/devicetree/bindings/soc/amlogic/amlogic,meson-gx-hhi-sysctrl.yaml
new file mode 100644
index 000000000000..672eabd90c09
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/amlogic/amlogic,meson-gx-hhi-sysctrl.yaml
@@ -0,0 +1,109 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/amlogic/amlogic,meson-gx-hhi-sysctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic Meson System Control registers
+
+maintainers:
+  - Neil Armstrong <neil.armstrong at linaro.org>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - amlogic,meson-gx-hhi-sysctrl
+          - amlogic,meson-gx-ao-sysctrl
+          - amlogic,meson-axg-hhi-sysctrl
+          - amlogic,meson-axg-ao-sysctrl
+      - const: simple-mfd
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  clock-controller:
+    type: object
+
+  power-controller:
+    $ref: /schemas/power/amlogic,meson-ee-pwrc.yaml
+
+  pinctrl:
+    type: object
+
+  phy:
+    type: object
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - amlogic,meson-gx-hhi-sysctrl
+            - amlogic,meson-axg-hhi-sysctrl
+    then:
+      required:
+        - power-controller
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - amlogic,meson-gx-ao-sysctrl
+            - amlogic,meson-axg-ao-sysctrl
+    then:
+      required:
+        - pinctrl
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - amlogic,meson-axg-hhi-sysctrl
+    then:
+      properties:
+        phy:
+          oneOf:
+            - $ref: /schemas/phy/amlogic,g12a-mipi-dphy-analog.yaml
+            - $ref: /schemas/phy/amlogic,meson-axg-mipi-pcie-analog.yaml
+
+required:
+  - compatible
+  - reg
+  - clock-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    sysctrl: system-controller at 0 {
+        compatible = "amlogic,meson-gx-hhi-sysctrl", "simple-mfd", "syscon";
+        reg = <0 0x400>;
+
+        clock-controller { };
+
+        power-controller {
+            compatible = "amlogic,meson-gxbb-pwrc";
+            #power-domain-cells = <1>;
+            amlogic,ao-sysctrl = <&sysctrl_AO>;
+
+            resets = <&reset_viu>,
+                     <&reset_venc>,
+                     <&reset_vcbus>,
+                     <&reset_bt656>,
+                     <&reset_dvin>,
+                     <&reset_rdma>,
+                     <&reset_venci>,
+                     <&reset_vencp>,
+                     <&reset_vdac>,
+                     <&reset_vdi6>,
+                     <&reset_vencl>,
+                     <&reset_vid_lock>;
+            reset-names = "viu", "venc", "vcbus", "bt656", "dvin",
+                          "rdma", "venci", "vencp", "vdac", "vdi6",
+                          "vencl", "vid_lock";
+            clocks = <&clk_vpu>, <&clk_vapb>;
+            clock-names = "vpu", "vapb";
+        };
+    };

-- 
2.34.1