xref: /linux/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml (revision 9f2c9170934eace462499ba0bfe042cc72900173) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/rtc/st,stm32-rtc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: STMicroelectronics STM32 Real Time Clock
8
9maintainers:
10  - Gabriel Fernandez <gabriel.fernandez@foss.st.com>
11
12properties:
13  compatible:
14    enum:
15      - st,stm32-rtc
16      - st,stm32h7-rtc
17      - st,stm32mp1-rtc
18
19  reg:
20    maxItems: 1
21
22  clocks:
23    minItems: 1
24    maxItems: 2
25
26  clock-names:
27    items:
28      - const: pclk
29      - const: rtc_ck
30
31  interrupts:
32    maxItems: 1
33
34  st,syscfg:
35    $ref: "/schemas/types.yaml#/definitions/phandle-array"
36    items:
37      minItems: 3
38      maxItems: 3
39    description: |
40      Phandle/offset/mask triplet. The phandle to pwrcfg used to
41      access control register at offset, and change the dbp (Disable Backup
42      Protection) bit represented by the mask, mandatory to disable/enable backup
43      domain (RTC registers) write protection.
44
45  assigned-clocks:
46    description: |
47      override default rtc_ck parent clock reference to the rtc_ck clock entry
48    maxItems: 1
49
50  assigned-clock-parents:
51    description: |
52      override default rtc_ck parent clock phandle of the new parent clock of rtc_ck
53    maxItems: 1
54
55allOf:
56  - if:
57      properties:
58        compatible:
59          contains:
60            const: st,stm32-rtc
61
62    then:
63      properties:
64        clocks:
65          minItems: 1
66          maxItems: 1
67
68        clock-names: false
69
70      required:
71        - st,syscfg
72
73  - if:
74      properties:
75        compatible:
76          contains:
77            const: st,stm32h7-rtc
78
79    then:
80      properties:
81        clocks:
82          minItems: 2
83          maxItems: 2
84
85      required:
86        - clock-names
87        - st,syscfg
88
89  - if:
90      properties:
91        compatible:
92          contains:
93            const: st,stm32mp1-rtc
94
95    then:
96      properties:
97        clocks:
98          minItems: 2
99          maxItems: 2
100
101        assigned-clocks: false
102        assigned-clock-parents: false
103
104      required:
105        - clock-names
106
107required:
108  - compatible
109  - reg
110  - clocks
111  - interrupts
112
113additionalProperties: false
114
115examples:
116  - |
117    #include <dt-bindings/mfd/stm32f4-rcc.h>
118    #include <dt-bindings/clock/stm32fx-clock.h>
119    rtc@40002800 {
120      compatible = "st,stm32-rtc";
121      reg = <0x40002800 0x400>;
122      clocks = <&rcc 1 CLK_RTC>;
123      assigned-clocks = <&rcc 1 CLK_RTC>;
124      assigned-clock-parents = <&rcc 1 CLK_LSE>;
125      interrupt-parent = <&exti>;
126      interrupts = <17 1>;
127      st,syscfg = <&pwrcfg 0x00 0x100>;
128    };
129
130  - |
131    #include <dt-bindings/interrupt-controller/arm-gic.h>
132    #include <dt-bindings/clock/stm32mp1-clks.h>
133    rtc@5c004000 {
134      compatible = "st,stm32mp1-rtc";
135      reg = <0x5c004000 0x400>;
136      clocks = <&rcc RTCAPB>, <&rcc RTC>;
137      clock-names = "pclk", "rtc_ck";
138      interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
139    };
140
141...
142