131 lines
3.1 KiB
YAML
131 lines
3.1 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/clock/google,gs101-clock.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Google GS101 SoC clock controller
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maintainers:
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- Peter Griffin <peter.griffin@linaro.org>
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description: |
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Google GS101 clock controller is comprised of several CMU units, generating
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clocks for different domains. Those CMU units are modeled as separate device
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tree nodes, and might depend on each other. The root clock in that clock tree
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is OSCCLK (24.576 MHz). That external clock must be defined as a fixed-rate
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clock in dts.
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CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
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dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. All clocks available for usage
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in clock consumer nodes are defined as preprocessor macros in
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'dt-bindings/clock/gs101.h' header.
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properties:
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compatible:
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enum:
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- google,gs101-cmu-top
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- google,gs101-cmu-apm
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- google,gs101-cmu-misc
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- google,gs101-cmu-peric0
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- google,gs101-cmu-peric1
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clocks:
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minItems: 1
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maxItems: 3
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clock-names:
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minItems: 1
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maxItems: 3
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"#clock-cells":
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const: 1
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reg:
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maxItems: 1
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required:
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- compatible
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- "#clock-cells"
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- clocks
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- clock-names
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- reg
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allOf:
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- if:
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properties:
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compatible:
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contains:
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enum:
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- google,gs101-cmu-top
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- google,gs101-cmu-apm
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (24.576 MHz)
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clock-names:
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items:
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- const: oscclk
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- if:
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properties:
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compatible:
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contains:
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const: google,gs101-cmu-misc
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then:
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properties:
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clocks:
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items:
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- description: Misc bus clock (from CMU_TOP)
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- description: Misc sss clock (from CMU_TOP)
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clock-names:
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items:
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- const: bus
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- const: sss
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- if:
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properties:
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compatible:
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contains:
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enum:
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- google,gs101-cmu-peric0
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- google,gs101-cmu-peric1
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (24.576 MHz)
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- description: Connectivity Peripheral 0/1 bus clock (from CMU_TOP)
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- description: Connectivity Peripheral 0/1 IP clock (from CMU_TOP)
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clock-names:
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items:
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- const: oscclk
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- const: bus
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- const: ip
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additionalProperties: false
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examples:
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# Clock controller node for CMU_TOP
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- |
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#include <dt-bindings/clock/google,gs101.h>
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cmu_top: clock-controller@1e080000 {
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compatible = "google,gs101-cmu-top";
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reg = <0x1e080000 0x8000>;
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#clock-cells = <1>;
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clocks = <&ext_24_5m>;
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clock-names = "oscclk";
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};
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...
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