xref: /linux/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml (revision f9bff0e31881d03badf191d3b0005839391f5f2b) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/i2c/st,stm32-i2c.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: I2C controller embedded in STMicroelectronics STM32 I2C platform
8
9maintainers:
10  - Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
11
12allOf:
13  - $ref: /schemas/i2c/i2c-controller.yaml#
14  - if:
15      properties:
16        compatible:
17          contains:
18            enum:
19              - st,stm32f7-i2c
20              - st,stm32mp13-i2c
21              - st,stm32mp15-i2c
22    then:
23      properties:
24        i2c-scl-rising-time-ns:
25          default: 25
26
27        i2c-scl-falling-time-ns:
28          default: 10
29    else:
30      properties:
31        st,syscfg-fmp: false
32
33  - if:
34      properties:
35        compatible:
36          contains:
37            enum:
38              - st,stm32f4-i2c
39    then:
40      properties:
41        clock-frequency:
42          enum: [100000, 400000]
43
44properties:
45  compatible:
46    enum:
47      - st,stm32f4-i2c
48      - st,stm32f7-i2c
49      - st,stm32mp13-i2c
50      - st,stm32mp15-i2c
51
52  reg:
53    maxItems: 1
54
55  interrupts:
56    items:
57      - description: interrupt ID for I2C event
58      - description: interrupt ID for I2C error
59
60  interrupt-names:
61    items:
62      - const: event
63      - const: error
64
65  resets:
66    maxItems: 1
67
68  clocks:
69    maxItems: 1
70
71  dmas:
72    items:
73      - description: RX DMA Channel phandle
74      - description: TX DMA Channel phandle
75
76  dma-names:
77    items:
78      - const: rx
79      - const: tx
80
81  clock-frequency:
82    description: Desired I2C bus clock frequency in Hz. If not specified,
83                 the default 100 kHz frequency will be used.
84                 For STM32F7, STM32H7 and STM32MP1 SoCs, if timing parameters
85                 match, the bus clock frequency can be from 1Hz to 1MHz.
86    default: 100000
87    minimum: 1
88    maximum: 1000000
89
90  st,syscfg-fmp:
91    description: Use to set Fast Mode Plus bit within SYSCFG when Fast Mode
92      Plus speed is selected by slave.
93    $ref: /schemas/types.yaml#/definitions/phandle-array
94    items:
95      - items:
96          - description: phandle to syscfg
97          - description: register offset within syscfg
98          - description: register bitmask for FMP bit
99
100  wakeup-source: true
101
102required:
103  - compatible
104  - reg
105  - interrupts
106  - resets
107  - clocks
108
109unevaluatedProperties: false
110
111examples:
112  - |
113    #include <dt-bindings/mfd/stm32f7-rcc.h>
114    #include <dt-bindings/clock/stm32fx-clock.h>
115    //Example 1 (with st,stm32f4-i2c compatible)
116      i2c@40005400 {
117          compatible = "st,stm32f4-i2c";
118          #address-cells = <1>;
119          #size-cells = <0>;
120          reg = <0x40005400 0x400>;
121          interrupts = <31>,
122                       <32>;
123          resets = <&rcc 277>;
124          clocks = <&rcc 0 149>;
125      };
126
127  - |
128    #include <dt-bindings/mfd/stm32f7-rcc.h>
129    #include <dt-bindings/clock/stm32fx-clock.h>
130    //Example 2 (with st,stm32f7-i2c compatible)
131      i2c@40005800 {
132          compatible = "st,stm32f7-i2c";
133          #address-cells = <1>;
134          #size-cells = <0>;
135          reg = <0x40005800 0x400>;
136          interrupts = <31>,
137                       <32>;
138          resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
139          clocks = <&rcc 1 CLK_I2C1>;
140      };
141
142  - |
143    #include <dt-bindings/mfd/stm32f7-rcc.h>
144    #include <dt-bindings/clock/stm32fx-clock.h>
145    //Example 3 (with st,stm32mp15-i2c compatible on stm32mp)
146    #include <dt-bindings/interrupt-controller/arm-gic.h>
147    #include <dt-bindings/clock/stm32mp1-clks.h>
148    #include <dt-bindings/reset/stm32mp1-resets.h>
149      i2c@40013000 {
150          compatible = "st,stm32mp15-i2c";
151          #address-cells = <1>;
152          #size-cells = <0>;
153          reg = <0x40013000 0x400>;
154          interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
155                       <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
156          clocks = <&rcc I2C2_K>;
157          resets = <&rcc I2C2_R>;
158          i2c-scl-rising-time-ns = <185>;
159          i2c-scl-falling-time-ns = <20>;
160          st,syscfg-fmp = <&syscfg 0x4 0x2>;
161      };
162