xref: /linux/Documentation/devicetree/bindings/net/ti,k3-am654-cpts.yaml (revision 4b132aacb0768ac1e652cf517097ea6f237214b9) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/net/ti,k3-am654-cpts.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: The TI AM654x/J721E Common Platform Time Sync (CPTS) module
8
9maintainers:
10  - Siddharth Vadapalli <s-vadapalli@ti.com>
11  - Roger Quadros <rogerq@kernel.org>
12
13description: |+
14  The TI AM654x/J721E CPTS module is used to facilitate host control of time
15  sync operations.
16  Main features of CPTS module are
17  - selection of multiple external clock sources
18  - Software control of time sync events via interrupt or polling
19  - 64-bit timestamp mode in ns with PPM and nudge adjustment.
20  - hardware timestamp push inputs (HWx_TS_PUSH)
21  - timestamp counter compare output (TS_COMP)
22  - timestamp counter bit output (TS_SYNC)
23  - periodic Generator function outputs (TS_GENFx)
24  - Ethernet Enhanced Scheduled Traffic Operations (CPTS_ESTFn) (TSN)
25  - external hardware timestamp push inputs (HWx_TS_PUSH) timestamping
26
27   Depending on integration it enables compliance with the IEEE 1588-2008
28   standard for a precision clock synchronization protocol, Ethernet Enhanced
29   Scheduled Traffic Operations (CPTS_ESTFn) and PCIe Subsystem Precision Time
30   Measurement (PTM).
31
32  TI AM654x/J721E SoCs has several similar CPTS modules integrated into the
33  different parts of the system which could be synchronized with each other
34  - Main CPTS
35  - MCU CPSW CPTS with IEEE 1588-2008 support
36  - PCIe subsystem CPTS for PTM support
37
38  Depending on CPTS module integration and when CPTS is integral part of
39  another module (MCU CPSW for example) "compatible" and "reg" can
40  be omitted - parent module is fully responsible for CPTS enabling and
41  configuration.
42
43properties:
44  $nodename:
45    pattern: "^cpts@[0-9a-f]+$"
46
47  compatible:
48    enum:
49      - ti,am65-cpts
50      - ti,j721e-cpts
51
52  reg:
53    maxItems: 1
54    description:
55      The physical base address and size of CPTS IO range
56
57  reg-names:
58    items:
59      - const: cpts
60
61  clocks:
62    maxItems: 1
63    description: CPTS reference clock
64
65  clock-names:
66    items:
67      - const: cpts
68
69  interrupts:
70    items:
71      - description: CPTS events interrupt
72
73  interrupt-names:
74    items:
75      - const: cpts
76
77  assigned-clock-parents: true
78
79  assigned-clocks: true
80
81  power-domains:
82    maxItems: 1
83
84  ti,cpts-ext-ts-inputs:
85    $ref: /schemas/types.yaml#/definitions/uint32
86    maximum: 8
87    description:
88      Number of hardware timestamp push inputs (HWx_TS_PUSH)
89
90  ti,cpts-periodic-outputs:
91    $ref: /schemas/types.yaml#/definitions/uint32
92    maximum: 8
93    description:
94      Number of timestamp Generator function outputs (TS_GENFx)
95
96  ti,pps:
97    $ref: /schemas/types.yaml#/definitions/uint32-array
98    minItems: 2
99    maxItems: 2
100    description: |
101      The pair of HWx_TS_PUSH input and TS_GENFy output indexes used for
102      PPS events generation. Platform/board specific.
103
104  refclk-mux:
105    type: object
106    additionalProperties: false
107    description: CPTS reference clock multiplexer clock
108    properties:
109      '#clock-cells':
110        const: 0
111
112      clocks:
113        maxItems: 8
114
115    required:
116      - clocks
117
118required:
119  - compatible
120  - reg
121  - clocks
122  - clock-names
123  - interrupts
124  - interrupt-names
125
126additionalProperties: false
127
128examples:
129  - |
130    #include <dt-bindings/interrupt-controller/irq.h>
131    #include <dt-bindings/interrupt-controller/arm-gic.h>
132
133    cpts@310d0000 {
134         compatible = "ti,am65-cpts";
135         reg = <0x310d0000 0x400>;
136         reg-names = "cpts";
137         clocks = <&main_cpts_mux>;
138         clock-names = "cpts";
139         interrupts-extended = <&k3_irq 163 0 IRQ_TYPE_LEVEL_HIGH>;
140         interrupt-names = "cpts";
141         ti,cpts-periodic-outputs = <6>;
142         ti,cpts-ext-ts-inputs = <8>;
143
144         main_cpts_mux: refclk-mux {
145               #clock-cells = <0>;
146               clocks = <&k3_clks 118 5>, <&k3_clks 118 11>,
147                        <&k3_clks 157 91>, <&k3_clks 157 77>,
148                        <&k3_clks 157 102>, <&k3_clks 157 80>,
149                        <&k3_clks 120 3>, <&k3_clks 121 3>;
150               assigned-clocks = <&main_cpts_mux>;
151               assigned-clock-parents = <&k3_clks 118 11>;
152         };
153    };
154