# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/net/ti,k3-am654-cpts.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: The TI AM654x/J721E Common Platform Time Sync (CPTS) module
maintainers:
- Siddharth Vadapalli <[email protected]>
- Roger Quadros <[email protected]>
description: |+
The TI AM654x/J721E CPTS module is used to facilitate host control of time
sync operations.
Main features of CPTS module are
- selection of multiple external clock sources
- Software control of time sync events via interrupt or polling
- 64-bit timestamp mode in ns with PPM and nudge adjustment.
- hardware timestamp push inputs (HWx_TS_PUSH)
- timestamp counter compare output (TS_COMP)
- timestamp counter bit output (TS_SYNC)
- periodic Generator function outputs (TS_GENFx)
- Ethernet Enhanced Scheduled Traffic Operations (CPTS_ESTFn) (TSN)
- external hardware timestamp push inputs (HWx_TS_PUSH) timestamping
Depending on integration it enables compliance with the IEEE 1588-2008
standard for a precision clock synchronization protocol, Ethernet Enhanced
Scheduled Traffic Operations (CPTS_ESTFn) and PCIe Subsystem Precision Time
Measurement (PTM).
TI AM654x/J721E SoCs has several similar CPTS modules integrated into the
different parts of the system which could be synchronized with each other
- Main CPTS
- MCU CPSW CPTS with IEEE 1588-2008 support
- PCIe subsystem CPTS for PTM support
Depending on CPTS module integration and when CPTS is integral part of
another module (MCU CPSW for example) "compatible" and "reg" can
be omitted - parent module is fully responsible for CPTS enabling and
configuration.
properties:
$nodename:
pattern: "^cpts@[0-9a-f]+$"
compatible:
enum:
- ti,am65-cpts
- ti,j721e-cpts
reg:
maxItems: 1
description:
The physical base address and size of CPTS IO range
reg-names:
items:
- const: cpts
clocks:
maxItems: 1
description: CPTS reference clock
clock-names:
items:
- const: cpts
interrupts:
items:
- description: CPTS events interrupt
interrupt-names:
items:
- const: cpts
assigned-clock-parents: true
assigned-clocks: true
power-domains:
maxItems: 1
ti,cpts-ext-ts-inputs:
$ref: /schemas/types.yaml#/definitions/uint32
maximum: 8
description:
Number of hardware timestamp push inputs (HWx_TS_PUSH)
ti,cpts-periodic-outputs:
$ref: /schemas/types.yaml#/definitions/uint32
maximum: 8
description:
Number of timestamp Generator function outputs (TS_GENFx)
ti,pps:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 2
maxItems: 2
description: |
The pair of HWx_TS_PUSH input and TS_GENFy output indexes used for
PPS events generation. Platform/board specific.
refclk-mux:
type: object
additionalProperties: false
description: CPTS reference clock multiplexer clock
properties:
'#clock-cells':
const: 0
clocks:
maxItems: 8
required:
- clocks
required:
- compatible
- reg
- clocks
- clock-names
- interrupts
- interrupt-names
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
cpts@310d0000 {
compatible = "ti,am65-cpts";
reg = <0x310d0000 0x400>;
reg-names = "cpts";
clocks = <&main_cpts_mux>;
clock-names = "cpts";
interrupts-extended = <&k3_irq 163 0 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "cpts";
ti,cpts-periodic-outputs = <6>;
ti,cpts-ext-ts-inputs = <8>;
main_cpts_mux: refclk-mux {
#clock-cells = <0>;
clocks = <&k3_clks 118 5>, <&k3_clks 118 11>,
<&k3_clks 157 91>, <&k3_clks 157 77>,
<&k3_clks 157 102>, <&k3_clks 157 80>,
<&k3_clks 120 3>, <&k3_clks 121 3>;
assigned-clocks = <&main_cpts_mux>;
assigned-clock-parents = <&k3_clks 118 11>;
};
};
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