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| 1 | +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | +%YAML 1.2 |
| 3 | +--- |
| 4 | +$id: http://devicetree.org/schemas/clock/google,gs101-clock.yaml# |
| 5 | +$schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | + |
| 7 | +title: Google GS101 SoC clock controller |
| 8 | + |
| 9 | +maintainers: |
| 10 | + - Peter Griffin <peter.griffin@linaro.org> |
| 11 | + |
| 12 | +description: | |
| 13 | + Google GS101 clock controller is comprised of several CMU units, generating |
| 14 | + clocks for different domains. Those CMU units are modeled as separate device |
| 15 | + tree nodes, and might depend on each other. The root clock in that clock tree |
| 16 | + is OSCCLK (24.576 MHz). That external clock must be defined as a fixed-rate |
| 17 | + clock in dts. |
| 18 | +
|
| 19 | + CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and |
| 20 | + dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP. |
| 21 | +
|
| 22 | + Each clock is assigned an identifier and client nodes can use this identifier |
| 23 | + to specify the clock which they consume. All clocks available for usage |
| 24 | + in clock consumer nodes are defined as preprocessor macros in |
| 25 | + 'dt-bindings/clock/gs101.h' header. |
| 26 | +
|
| 27 | +properties: |
| 28 | + compatible: |
| 29 | + enum: |
| 30 | + - google,gs101-cmu-top |
| 31 | + - google,gs101-cmu-apm |
| 32 | + - google,gs101-cmu-misc |
| 33 | + |
| 34 | + clocks: |
| 35 | + minItems: 1 |
| 36 | + maxItems: 2 |
| 37 | + |
| 38 | + clock-names: |
| 39 | + minItems: 1 |
| 40 | + maxItems: 2 |
| 41 | + |
| 42 | + "#clock-cells": |
| 43 | + const: 1 |
| 44 | + |
| 45 | + reg: |
| 46 | + maxItems: 1 |
| 47 | + |
| 48 | +required: |
| 49 | + - compatible |
| 50 | + - "#clock-cells" |
| 51 | + - clocks |
| 52 | + - clock-names |
| 53 | + - reg |
| 54 | + |
| 55 | +allOf: |
| 56 | + - if: |
| 57 | + properties: |
| 58 | + compatible: |
| 59 | + contains: |
| 60 | + enum: |
| 61 | + - google,gs101-cmu-top |
| 62 | + - google,gs101-cmu-apm |
| 63 | + then: |
| 64 | + properties: |
| 65 | + clocks: |
| 66 | + items: |
| 67 | + - description: External reference clock (24.576 MHz) |
| 68 | + |
| 69 | + clock-names: |
| 70 | + items: |
| 71 | + - const: oscclk |
| 72 | + |
| 73 | + - if: |
| 74 | + properties: |
| 75 | + compatible: |
| 76 | + contains: |
| 77 | + const: google,gs101-cmu-misc |
| 78 | + |
| 79 | + then: |
| 80 | + properties: |
| 81 | + clocks: |
| 82 | + items: |
| 83 | + - description: Misc bus clock (from CMU_TOP) |
| 84 | + - description: Misc sss clock (from CMU_TOP) |
| 85 | + |
| 86 | + clock-names: |
| 87 | + items: |
| 88 | + - const: dout_cmu_misc_bus |
| 89 | + - const: dout_cmu_misc_sss |
| 90 | + |
| 91 | +additionalProperties: false |
| 92 | + |
| 93 | +examples: |
| 94 | + # Clock controller node for CMU_TOP |
| 95 | + - | |
| 96 | + #include <dt-bindings/clock/google,gs101.h> |
| 97 | +
|
| 98 | + cmu_top: clock-controller@1e080000 { |
| 99 | + compatible = "google,gs101-cmu-top"; |
| 100 | + reg = <0x1e080000 0x8000>; |
| 101 | + #clock-cells = <1>; |
| 102 | + clocks = <&ext_24_5m>; |
| 103 | + clock-names = "oscclk"; |
| 104 | + }; |
| 105 | +
|
| 106 | +... |
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