dt-bindings: clock: add Exynos Auto v9 SoC CMU bindings

Add dt-schema for Exynos Auto v9 SoC clock controller.

Signed-off-by: Chanho Park <[e-mail]>
Reviewed-by: Chanwoo Choi <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/clock/samsung,exynosautov9-clock.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/samsung,exynosautov9-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos Auto v9 SoC clock controller
+
+maintainers:
+  - Chanho Park <[e-mail]>
+  - Chanwoo Choi <[e-mail]>
+  - Krzysztof Kozlowski <[e-mail]>
+  - Sylwester Nawrocki <[e-mail]>
+  - Tomasz Figa <[e-mail]>
+
+description: |
+  Exynos Auto v9 clock controller is comprised of several CMU units, generating
+  clocks for different domains. Those CMU units are modeled as separate device
+  tree nodes, and might depend on each other. Root clocks in that clock tree are
+  two external clocks:: OSCCLK/XTCXO (26 MHz) and RTCCLK/XrtcXTI (32768 Hz).
+  The external OSCCLK must be defined as fixed-rate clock in dts.
+
+  CMU_TOP 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_TOP.
+
+  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/samsung,exynosautov9.h' header.
+
+properties:
+  compatible:
+    enum:
+      - samsung,exynosautov9-cmu-top
+      - samsung,exynosautov9-cmu-busmc
+      - samsung,exynosautov9-cmu-core
+      - samsung,exynosautov9-cmu-fsys2
+      - samsung,exynosautov9-cmu-peric0
+      - samsung,exynosautov9-cmu-peric1
+      - samsung,exynosautov9-cmu-peris
+
+  clocks:
+    minItems: 1
+    maxItems: 5
+
+  clock-names:
+    minItems: 1
+    maxItems: 5
+
+  "#clock-cells":
+    const: 1
+
+  reg:
+    maxItems: 1
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-top
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+
+        clock-names:
+          items:
+            - const: oscclk
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-busmc
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_BUSMC bus clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_busmc_bus
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-core
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_CORE bus clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_core_bus
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-fsys2
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_FSYS2 bus clock (from CMU_TOP)
+            - description: UFS clock (from CMU_TOP)
+            - description: Ethernet clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_fsys2_bus
+            - const: dout_fsys2_clkcmu_ufs_embd
+            - const: dout_fsys2_clkcmu_ethernet
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-peric0
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_PERIC0 bus clock (from CMU_TOP)
+            - description: PERIC0 IP clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_peric0_bus
+            - const: dout_clkcmu_peric0_ip
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-peric1
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_PERIC1 bus clock (from CMU_TOP)
+            - description: PERIC1 IP clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_peric1_bus
+            - const: dout_clkcmu_peric1_ip
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov9-cmu-peris
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: CMU_PERIS bus clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_peris_bus
+
+required:
+  - compatible
+  - "#clock-cells"
+  - clocks
+  - clock-names
+  - reg
+
+additionalProperties: false
+
+examples:
+  # Clock controller node for CMU_FSYS2
+  - |
+    #include <dt-bindings/clock/samsung,exynosautov9.h>
+
+    cmu_fsys2: clock-controller@17c00000 {
+        compatible = "samsung,exynosautov9-cmu-fsys2";
+        reg = <0x17c00000 0x8000>;
+        #clock-cells = <1>;
+
+        clocks = <&xtcxo>,
+                 <&cmu_top DOUT_CLKCMU_FSYS2_BUS>,
+                 <&cmu_top DOUT_CLKCMU_FSYS2_UFS_EMBD>,
+                 <&cmu_top DOUT_CLKCMU_FSYS2_ETHERNET>;
+        clock-names = "oscclk",
+                      "dout_clkcmu_fsys2_bus",
+                      "dout_fsys2_clkcmu_ufs_embd",
+                      "dout_fsys2_clkcmu_ethernet";
+    };
+
+...