linux-kernel - [PATCH 1/4] dt-bindings: clock: renesas: Document RZ/V2H(P) SoC CPG driver

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Message-Id: <20240524082800.333991-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 24 May 2024 09:27:57 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 1/4] dt-bindings: clock: renesas: Document RZ/V2H(P) SoC CPG driver

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Document the device tree bindings of the Renesas RZ/V2H(P) SoC
Clock Pulse Generator (CPG).

CPG block handles the below operations:
- Handles the generation and control of clock signals for the IP modules
- The generation and control of resets
- Control over booting
- Low power consumption and the power supply domains

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 .../bindings/clock/renesas,rzv2h-cpg.yaml     | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,rzv2h-cpg.yaml

diff --git a/Documentation/devicetree/bindings/clock/renesas,rzv2h-cpg.yaml b/Documentation/devicetree/bindings/clock/renesas,rzv2h-cpg.yaml
new file mode 100644
index 000000000000..baa0f2a5b6f9
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,rzv2h-cpg.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/renesas,rzv2h-cpg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/V2H(P) Clock Pulse Generator (CPG)
+
+maintainers:
+  - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
+
+description: |
+  On Renesas RZ/V2H(P) SoC's, the CPG (Clock Pulse Generator) handles the generation
+  and control of clock signals for the IP modules, the generation and control of resets,
+  and control over booting, low power consumption and the power supply domains.
+
+properties:
+  compatible:
+    const: renesas,r9a09g057-cpg
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    description:
+      Clock source to CPG can be either from external clock input (EXCLK) or
+      crystal oscillator (XIN/XOUT).
+    const: extal
+
+  '#clock-cells':
+    description: |
+      - For CPG core clocks, the two clock specifier cells must be "CPG_CORE"
+        and a core clock reference, as defined in
+        <dt-bindings/clock/r9a09g057-cpg.h>,
+      - For module clocks, the two clock specifier cells must be "CPG_MOD" and
+        a module number, as defined in <dt-bindings/clock/r9a09g057-cpg.h>.
+    const: 2
+
+  '#power-domain-cells':
+    description:
+      SoC devices that are part of the CPG/Module Standby Mode Clock Domain and
+      can be power-managed through Module Standby should refer to the CPG device
+      node in their "power-domains" property, as documented by the generic PM
+      Domain bindings in Documentation/devicetree/bindings/power/power-domain.yaml.
+      The power domain specifiers defined in <dt-bindings/clock/r9a09g057-cpg.h> could
+      be used to reference individual CPG power domains.
+
+  '#reset-cells':
+    description:
+      The single reset specifier cell must be the module number, as defined in
+      <dt-bindings/clock/r9a09g057-cpg.h>.
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#clock-cells'
+  - '#power-domain-cells'
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    cpg: clock-controller@...20000 {
+            compatible = "renesas,r9a09g057-cpg";
+            reg = <0x10420000 0x10000>;
+            clocks = <&extal_clk>;
+            clock-names = "extal";
+            #clock-cells = <2>;
+            #power-domain-cells = <0>;
+            #reset-cells = <1>;
+    };
-- 
2.34.1