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@xxxxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> Signed-off-by: Martin Povišer <povik+lin@xxxxxxxxxxx> --- .../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@xxxxxxxxxxx> + +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@23b044000 { + compatible = "apple,t8103-nco", "apple,nco"; + reg = <0x3b044000 0x14000>; + #clock-cells = <1>; + clocks = <&nco_clkref>; + }; -- 2.33.0
