Provide dt-schema documentation for Google gs101 SoC clock controller. Signed-off-by: Peter Griffin <peter.griffin@xxxxxxxxxx> --- .../bindings/clock/google,gs101-clock.yaml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/google,gs101-clock.yaml diff --git a/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml new file mode 100644 index 000000000000..a28d05d88afe --- /dev/null +++ b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml @@ -0,0 +1,109 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/google,gs101-clock.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Google GS101 SoC clock controller + +maintainers: + - Peter Griffin <peter.griffin@xxxxxxxxxx> + +description: | + Google GS101 clock controller is comprised of several CMU units, generating + clocks for different domains. Those CMU units are modeled as separate device + tree nodes, and might depend on each other. The root clock in that clock tree + is OSCCLK (24.576 MHz). That external clock must be defined as a fixed-rate + clock in dts. + + CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and + dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP. + + Each clock is assigned an identifier and client nodes can use this identifier + to specify the clock which they consume. All clocks available for usage + in clock consumer nodes are defined as preprocessor macros in + 'dt-bindings/clock/gs101.h' header. + +properties: + compatible: + enum: + - google,gs101-cmu-top + - google,gs101-cmu-apm + - google,gs101-cmu-misc + + clocks: + minItems: 1 + maxItems: 5 + + clock-names: + minItems: 1 + maxItems: 5 + + "#clock-cells": + const: 1 + + reg: + maxItems: 1 + +allOf: + - if: + properties: + compatible: + contains: + const: google,gs101-cmu-top + + then: + properties: + clocks: + items: + - description: External reference clock (24.576 MHz) + + clock-names: + items: + - const: oscclk + + - if: + properties: + compatible: + contains: + const: google,gs101-cmu-misc + + then: + properties: + clocks: + items: + - description: External reference clock (24.576 MHz) + - description: Misc bus clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_cmu_misc_bus + +required: + - compatible + - "#clock-cells" + - clocks + - clock-names + - reg + +additionalProperties: false + +examples: + # Clock controller node for CMU_TOP + - | + #include <dt-bindings/interrupt-controller/gs101.h> + soc { + #address-cells = <2>; + #size-cells = <1>; + + cmu_top: clock-controller@1e080000 { + compatible = "google,gs101-cmu-top"; + reg = <0x0 0x1e080000 0x8000>; + #clock-cells = <1>; + clocks = <&ext_24_5m>; + clock-names = "oscclk"; + }; + }; + +... -- 2.42.0.582.g8ccd20d70d-goog
