xref: /linux/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml (revision 95298d63c67673c654c08952672d016212b26054) 
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@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,stm32mp15-i2c
21    then:
22      properties:
23        i2c-scl-rising-time-ns:
24          default: 25
25
26        i2c-scl-falling-time-ns:
27          default: 10
28
29        st,syscfg-fmp:
30          description: Use to set Fast Mode Plus bit within SYSCFG when
31                       Fast Mode Plus speed is selected by slave.
32                       Format is phandle to syscfg / register offset within
33                       syscfg / register bitmask for FMP bit.
34          $ref: "/schemas/types.yaml#/definitions/phandle-array"
35          items:
36            minItems: 3
37            maxItems: 3
38
39  - if:
40      properties:
41        compatible:
42          contains:
43            enum:
44              - st,stm32f4-i2c
45    then:
46      properties:
47        clock-frequency:
48          enum: [100000, 400000]
49
50properties:
51  compatible:
52    enum:
53      - st,stm32f4-i2c
54      - st,stm32f7-i2c
55      - st,stm32mp15-i2c
56
57  reg:
58    maxItems: 1
59
60  interrupts:
61    items:
62      - description: interrupt ID for I2C event
63      - description: interrupt ID for I2C 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
90required:
91  - compatible
92  - reg
93  - interrupts
94  - resets
95  - clocks
96
97examples:
98  - |
99    #include <dt-bindings/mfd/stm32f7-rcc.h>
100    #include <dt-bindings/clock/stm32fx-clock.h>
101    //Example 1 (with st,stm32f4-i2c compatible)
102      i2c@40005400 {
103          compatible = "st,stm32f4-i2c";
104          #address-cells = <1>;
105          #size-cells = <0>;
106          reg = <0x40005400 0x400>;
107          interrupts = <31>,
108                       <32>;
109          resets = <&rcc 277>;
110          clocks = <&rcc 0 149>;
111      };
112
113    //Example 2 (with st,stm32f7-i2c compatible)
114      i2c@40005800 {
115          compatible = "st,stm32f7-i2c";
116          #address-cells = <1>;
117          #size-cells = <0>;
118          reg = <0x40005800 0x400>;
119          interrupts = <31>,
120                       <32>;
121          resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
122          clocks = <&rcc 1 CLK_I2C1>;
123      };
124
125    //Example 3 (with st,stm32mp15-i2c compatible on stm32mp)
126    #include <dt-bindings/interrupt-controller/arm-gic.h>
127    #include <dt-bindings/clock/stm32mp1-clks.h>
128    #include <dt-bindings/reset/stm32mp1-resets.h>
129      i2c@40013000 {
130          compatible = "st,stm32mp15-i2c";
131          #address-cells = <1>;
132          #size-cells = <0>;
133          reg = <0x40013000 0x400>;
134          interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
135                       <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
136          clocks = <&rcc I2C2_K>;
137          resets = <&rcc I2C2_R>;
138          i2c-scl-rising-time-ns = <185>;
139          i2c-scl-falling-time-ns = <20>;
140          st,syscfg-fmp = <&syscfg 0x4 0x2>;
141      };
142...
143