linux-kernel - [PATCH 11/16] dt-bindings: clock: renesas: Document RZ/G2L SoC CPG driver

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Message-Id: <20210514192218.13022-12-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Fri, 14 May 2021 20:22:13 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: [PATCH 11/16] dt-bindings: clock: renesas: Document RZ/G2L SoC CPG driver

Document the device tree bindings of the Renesas RZ/G2L SoC clock
driver in Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
 .../bindings/clock/renesas,rzg2l-cpg.yaml     | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml

diff --git a/Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml b/Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml
new file mode 100644
index 000000000000..463d6667951b
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/clock/renesas,rzg2l-cpg.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Renesas RZ/G2L Clock Pulse Generator / Module Stop and Software Reset
+
+maintainers:
+  - Geert Uytterhoeven <geert+renesas@...der.be>
+
+description: |
+  On Renesas RZ/G2L SoC, the CPG (Clock Pulse Generator) and MSTP
+  (Module Stop and Software Reset) share the same register block.
+
+  They provide the following functionalities:
+    - The CPG block generates various core clocks,
+    - The MSTP block provides two functions:
+        1. Module Stop, providing a Clock Domain to control the clock supply
+           to individual SoC devices,
+        2. Reset Control, to perform a software reset of individual SoC devices.
+
+properties:
+  compatible:
+    const: renesas,r9a07g044l-cpg  # RZ/G2L
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    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/*-cpg-mssr.h>
+      - For module clocks, the two clock specifier cells must be "CPG_MOD" and
+        a module number, as defined in the datasheet.
+    const: 2
+
+  '#power-domain-cells':
+    description:
+      SoC devices that are part of the CPG/MSTP Clock Domain and can be
+      power-managed through Module Stop 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.
+    const: 0
+
+  '#reset-cells':
+    description:
+      The single reset specifier cell must be the module number, as defined in
+      the datasheet.
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#clock-cells'
+  - '#power-domain-cells'
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    cpg: clock-controller@...10000 {
+            compatible = "renesas,r9a07g044l-cpg";
+            reg = <0x11010000 0x10000>;
+            clocks = <&extal_clk>;
+            clock-names = "extal";
+            #clock-cells = <2>;
+            #power-domain-cells = <0>;
+            #reset-cells = <1>;
+    };
-- 
2.17.1