linux-kernel - [PATCH v3 1/3] dt-bindings: clock: Add Apple NCO

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Date:   Fri, 21 Jan 2022 17:55:45 +0000
From:   Martin Povišer <povik+lin@...tonmail.com>
To:     mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org
Cc:     marcan@...can.st, sven@...npeter.dev, alyssa@...enzweig.io,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kettenis@...nbsd.org,
        Martin Povišer <povik+lin@...tonmail.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v3 1/3] dt-bindings: clock: Add Apple NCO

The NCO block found on Apple SoCs is a programmable clock generator
performing fractional division of a high frequency input clock.

Reviewed-by: Mark Kettenis <kettenis@...nbsd.org>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Martin Povišer <povik+lin@...tonmail.com>
---
 .../devicetree/bindings/clock/apple,nco.yaml  | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/apple,nco.yaml

diff --git a/Documentation/devicetree/bindings/clock/apple,nco.yaml b/Documentation/devicetree/bindings/clock/apple,nco.yaml
new file mode 100644
index 000000000000..23ee3964fbde
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/apple,nco.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/apple,nco.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple SoCs' NCO block
+
+maintainers:
+  - Martin Povišer <povik+lin@...tonmail.com>
+
+description: |
+  The NCO (Numerically Controlled Oscillator) block found on Apple SoCs
+  such as the t8103 (M1) is a programmable clock generator performing
+  fractional division of a high frequency input clock.
+
+  It carries a number of independent channels and is typically used for
+  generation of audio bitclocks.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t6000-nco
+          - apple,t8103-nco
+      - const: apple,nco
+
+  clocks:
+    description:
+      Specifies the reference clock from which the output clocks
+      are derived through fractional division.
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - clocks
+  - '#clock-cells'
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    nco_clkref: clock-ref {
+      compatible = "fixed-clock";
+      #clock-cells = <0>;
+      clock-frequency = <900000000>;
+      clock-output-names = "nco-ref";
+    };
+
+    nco: clock-controller@...044000 {
+      compatible = "apple,t8103-nco", "apple,nco";
+      reg = <0x3b044000 0x14000>;
+      #clock-cells = <1>;
+      clocks = <&nco_clkref>;
+    };
--
2.33.0