Based on kernel version 6.11. Page generated on 2024-09-24 08:21 EST.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/clock/arm,syscon-icst.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: ARM System Controller ICST Clocks maintainers: - Linus Walleij <linusw@kernel.org> description: | The ICS525 and ICS307 oscillators are produced by Integrated Devices Technology (IDT). ARM integrated these oscillators deeply into their reference designs by adding special control registers that manage such oscillators to their system controllers. The various ARM system controllers contain logic to serialize and initialize an ICST clock request after a write to the 32 bit register at an offset into the system controller. Furthermore, to even be able to alter one of these frequencies, the system controller must first be unlocked by writing a special token to another offset in the system controller. Some ARM hardware contain special versions of the serial interface that only connects the low 8 bits of the VDW (missing one bit), hard-wires RDW to different values and sometimes also hard-wires the output divider. They therefore have special compatible strings as per this table (the OD value is the value on the pins, not the resulting output divider). In the core modules and logic tiles, the ICST is a configurable clock fed from a 24 MHz clock on the motherboard (usually the main crystal) used for generating e.g. video clocks. It is located on the core module and there is only one of these. This clock node must be a subnode of the core module. Hardware variant RDW OD VDW Integrator/AP 22 1 Bit 8 0, rest variable integratorap-cm Integrator/AP 46 3 Bit 8 0, rest variable integratorap-sys Integrator/AP 22 or 1 17 or (33 or 25 MHz) integratorap-pci 14 1 14 Integrator/CP 22 variable Bit 8 0, rest variable integratorcp-cm-core Integrator/CP 22 variable Bit 8 0, rest variable integratorcp-cm-mem The ICST oscillator must be provided inside a system controller node. properties: "#clock-cells": const: 0 compatible: enum: - arm,syscon-icst525 - arm,syscon-icst307 - arm,syscon-icst525-integratorap-cm - arm,syscon-icst525-integratorap-sys - arm,syscon-icst525-integratorap-pci - arm,syscon-icst525-integratorcp-cm-core - arm,syscon-icst525-integratorcp-cm-mem - arm,integrator-cm-auxosc - arm,versatile-cm-auxosc - arm,impd1-vco1 - arm,impd1-vco2 reg: maxItems: 1 description: The VCO register clocks: description: Parent clock for the ICST VCO maxItems: 1 clock-output-names: maxItems: 1 lock-offset: $ref: /schemas/types.yaml#/definitions/uint32 description: Offset to the unlocking register for the oscillator vco-offset: $ref: /schemas/types.yaml#/definitions/uint32 description: Offset to the VCO register for the oscillator deprecated: true required: - "#clock-cells" - compatible - clocks additionalProperties: false examples: - | vco1: clock { compatible = "arm,impd1-vco1"; #clock-cells = <0>; lock-offset = <0x08>; vco-offset = <0x00>; clocks = <&sysclk>; clock-output-names = "IM-PD1-VCO1"; }; ... |