> Date: Tue, 18 Jan 2022 19:21:03 +0000 > From: Martin Povišer <povik+lin@xxxxxxxxxxxxxx> > > The NCO block found on Apple SoCs is a programmable clock generator > performing fractional division of a high frequency input clock. > > Signed-off-by: Martin Povišer <povik+lin@xxxxxxxxxxxxxx> Reviewed-by: Mark Kettenis <kettenis@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..da56b64b8fff > --- /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@xxxxxxxxxxxxxx> > + > +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 > > >
