linux-kernel - [PATCH 1/5] dt-bindings: clock: add Exynos Auto v920 SoC CMU bindings

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Message-ID: <20240705021110.2495344-2-sunyeal.hong@samsung.com>
Date: Fri,  5 Jul 2024 11:11:06 +0900
From: Sunyeal Hong <sunyeal.hong@...sung.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Sylwester Nawrocki
	<s.nawrocki@...sung.com>, Chanwoo Choi <cw00.choi@...sung.com>, Alim Akhtar
	<alim.akhtar@...sung.com>, Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>
Cc: linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sunyeal Hong <sunyeal.hong@...sung.com>
Subject: [PATCH 1/5] dt-bindings: clock: add Exynos Auto v920 SoC CMU
 bindings

Add dt-schema for Exynos Auto v920 SoC clock controller.

Signed-off-by: Sunyeal Hong <sunyeal.hong@...sung.com>
---
 .../clock/samsung,exynosautov920-clock.yaml   | 115 ++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml
new file mode 100644
index 000000000000..3e5e408c8336
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml
@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/samsung,exynosautov920-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos Auto v920 SoC clock controller
+
+maintainers:
+  - Sunyeal Hong <sunyeal.hong@...sung.com>
+  - Chanwoo Choi <cw00.choi@...sung.com>
+  - Krzysztof Kozlowski <krzk@...nel.org>
+  - Sylwester Nawrocki <s.nawrocki@...sung.com>
+
+description: |
+  Exynos Auto v920 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 (38.4 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,exynosautov920.h' header.
+
+properties:
+  compatible:
+    enum:
+      - samsung,exynosautov920-cmu-top
+      - samsung,exynosautov920-cmu-peric0
+
+  clocks:
+    minItems: 1
+    maxItems: 3
+
+  clock-names:
+    minItems: 1
+    maxItems: 3
+
+  "#clock-cells":
+    const: 1
+
+  reg:
+    maxItems: 1
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov920-cmu-top
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (38.4 MHz)
+
+        clock-names:
+          items:
+            - const: oscclk
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynosautov920-cmu-peric0
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (38.4 MHz)
+            - description: CMU_PERIC0 NOC clock (from CMU_TOP)
+            - description: CMU_PERIC0 IP clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_clkcmu_peric0_noc
+            - const: dout_clkcmu_peric0_ip
+
+required:
+  - compatible
+  - "#clock-cells"
+  - clocks
+  - clock-names
+  - reg
+
+additionalProperties: false
+
+examples:
+  # Clock controller node for CMU_PERIC0
+  - |
+    #include <dt-bindings/clock/samsung,exynosautov920.h>
+
+    cmu_peric0: clock-controller@...00000 {
+        compatible = "samsung,exynosautov920-cmu-peric0";
+        reg = <0x10800000 0x8000>;
+        #clock-cells = <1>;
+
+        clocks = <&xtcxo>,
+                 <&cmu_top DOUT_CLKCMU_PERIC0_NOC>,
+                 <&cmu_top DOUT_CLKCMU_PERIC0_IP>;
+        clock-names = "oscclk",
+                      "dout_clkcmu_peric0_noc",
+                      "dout_clkcmu_peric0_ip";
+    };
+
+...
-- 
2.43.2