summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/net/ti,k3-am654-cpts.yaml
blob: a30419ef550a4e1cf31201781ca8a469535a45fd (plain)
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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
# 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 Device Tree Bindings

maintainers:
  - Grygorii Strashko <grygorii.strashko@ti.com>
  - Sekhar Nori <nsekhar@ti.com>

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)

  refclk-mux:
    type: object
    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>;
         };
    };