dt-bindings: clock: Add ARTPEC-8 clock controller

Add dt-schema for Axis ARTPEC-8 SoC clock controller.

The Clock Management Unit (CMU) has a top-level block CMU_CMU
which generates clocks for other blocks.

Add device-tree binding definitions for following CMU blocks:
- CMU_CMU
- CMU_BUS
- CMU_CORE
- CMU_CPUCL
- CMU_FSYS
- CMU_IMEM
- CMU_PERI

Signed-off-by: Hakyeong Kim <hgkim05@coasia.com>
Signed-off-by: SeonGu Kang <ksk4725@coasia.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Ravi Patel <ravi.patel@samsung.com>
Link: https://lore.kernel.org/r/20250825114436.46882-2-ravi.patel@samsung.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

1 files changed, 213 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml b/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml
new file mode 100644
index 000000000000..277af48ac841
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/axis,artpec8-clock.yaml
@@ -0,0 +1,213 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/axis,artpec8-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Axis ARTPEC-8 SoC clock controller
+
+maintainers:
+  - Jesper Nilsson <jesper.nilsson@axis.com>
+
+description: |
+  ARTPEC-8 clock controller is comprised of several CMU (Clock Management Unit)
+  units, generating clocks for different domains. Those CMU units are modeled
+  as separate device tree nodes, and might depend on each other.
+  The root clock in that root tree is an external clock: OSCCLK (25 MHz).
+  This external clock must be defined as a fixed-rate clock in dts.
+
+  CMU_CMU is a top-level CMU, where all base clocks are prepared using PLLs and
+  dividers; all other clocks of function blocks (other CMUs) are usually
+  derived from CMU_CMU.
+
+  Each clock is assigned an identifier and client nodes can use this identifier
+  to specify the clock which they consume. All clocks available for usage
+  in clock consumer nodes are defined as preprocessor macros in
+  'include/dt-bindings/clock/axis,artpec8-clk.h' header.
+
+properties:
+  compatible:
+    enum:
+      - axis,artpec8-cmu-cmu
+      - axis,artpec8-cmu-bus
+      - axis,artpec8-cmu-core
+      - axis,artpec8-cmu-cpucl
+      - axis,artpec8-cmu-fsys
+      - axis,artpec8-cmu-imem
+      - axis,artpec8-cmu-peri
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    maxItems: 5
+
+  clock-names:
+    minItems: 1
+    maxItems: 5
+
+  "#clock-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#clock-cells"
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-cmu
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+
+        clock-names:
+          items:
+            - const: fin_pll
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-bus
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_BUS BUS clock (from CMU_CMU)
+            - description: CMU_BUS DLP clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: bus
+            - const: dlp
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-core
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_CORE main clock (from CMU_CMU)
+            - description: CMU_CORE DLP clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: main
+            - const: dlp
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-cpucl
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_CPUCL switch clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: switch
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-fsys
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_FSYS SCAN0 clock (from CMU_CMU)
+            - description: CMU_FSYS SCAN1 clock (from CMU_CMU)
+            - description: CMU_FSYS BUS clock (from CMU_CMU)
+            - description: CMU_FSYS IP clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: scan0
+            - const: scan1
+            - const: bus
+            - const: ip
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-imem
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_IMEM ACLK clock (from CMU_CMU)
+            - description: CMU_IMEM JPEG clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: aclk
+            - const: jpeg
+
+  - if:
+      properties:
+        compatible:
+          const: axis,artpec8-cmu-peri
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (25 MHz)
+            - description: CMU_PERI IP clock (from CMU_CMU)
+            - description: CMU_PERI AUDIO clock (from CMU_CMU)
+            - description: CMU_PERI DISP clock (from CMU_CMU)
+
+        clock-names:
+          items:
+            - const: fin_pll
+            - const: ip
+            - const: audio
+            - const: disp
+
+additionalProperties: false
+
+examples:
+  # Clock controller node for CMU_FSYS
+  - |
+    #include <dt-bindings/clock/axis,artpec8-clk.h>
+
+    cmu_fsys: clock-controller@16c10000 {
+        compatible = "axis,artpec8-cmu-fsys";
+        reg = <0x16c10000 0x4000>;
+        #clock-cells = <1>;
+        clocks = <&fin_pll>,
+                 <&cmu_cmu CLK_DOUT_CMU_FSYS_SCAN0>,
+                 <&cmu_cmu CLK_DOUT_CMU_FSYS_SCAN1>,
+                 <&cmu_cmu CLK_DOUT_CMU_FSYS_BUS>,
+                 <&cmu_cmu CLK_DOUT_CMU_FSYS_IP>;
+        clock-names = "fin_pll", "scan0", "scan1", "bus", "ip";
+    };
+
+...