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
7 title: I2C controller embedded in STMicroelectronics STM32 I2C platform
8
9 maintainers:
10 - Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
11
12 allOf:
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 - st,stm32mp25-i2c
23 then:
24 properties:
25 i2c-scl-rising-time-ns:
26 default: 25
27
28 i2c-scl-falling-time-ns:
29 default: 10
30 else:
31 properties:
32 st,syscfg-fmp: false
33
34 - if:
35 properties:
36 compatible:
37 contains:
38 enum:
39 - st,stm32f4-i2c
40 then:
41 properties:
42 clock-frequency:
43 enum: [100000, 400000]
44
45 - if:
46 properties:
47 compatible:
48 contains:
49 enum:
50 - st,stm32f4-i2c
51 - st,stm32f7-i2c
52 - st,stm32mp13-i2c
53 - st,stm32mp15-i2c
54 then:
55 properties:
56 interrupts:
57 minItems: 2
58
59 interrupt-names:
60 minItems: 2
61 else:
62 properties:
63 interrupts:
64 maxItems: 1
65
66 interrupt-names:
67 maxItems: 1
68
69 properties:
70 compatible:
71 enum:
72 - st,stm32f4-i2c
73 - st,stm32f7-i2c
74 - st,stm32mp13-i2c
75 - st,stm32mp15-i2c
76 - st,stm32mp25-i2c
77
78 reg:
79 maxItems: 1
80
81 interrupts:
82 items:
83 - description: interrupt ID for I2C event
84 - description: interrupt ID for I2C error
85 minItems: 1
86
87 interrupt-names:
88 items:
89 - const: event
90 - const: error
91 minItems: 1
92
93 resets:
94 maxItems: 1
95
96 clocks:
97 maxItems: 1
98
99 dmas:
100 items:
101 - description: RX DMA Channel phandle
102 - description: TX DMA Channel phandle
103
104 dma-names:
105 items:
106 - const: rx
107 - const: tx
108
109 clock-frequency:
110 description: Desired I2C bus clock frequency in Hz. If not specified,
111 the default 100 kHz frequency will be used.
112 For STM32F7, STM32H7 and STM32MP1 SoCs, if timing parameters
113 match, the bus clock frequency can be from 1Hz to 1MHz.
114 default: 100000
115 minimum: 1
116 maximum: 1000000
117
118 st,syscfg-fmp:
119 description: Use to set Fast Mode Plus bit within SYSCFG when Fast Mode
120 Plus speed is selected by slave.
121 $ref: /schemas/types.yaml#/definitions/phandle-array
122 items:
123 - items:
124 - description: phandle to syscfg
125 - description: register offset within syscfg
126 - description: register bitmask for FMP bit
127
128 wakeup-source: true
129
130 access-controllers:
131 minItems: 1
132 maxItems: 2
133
134 required:
135 - compatible
136 - reg
137 - interrupts
138 - resets
139 - clocks
140
141 unevaluatedProperties: false
142
143 examples:
144 - |
145 #include <dt-bindings/mfd/stm32f7-rcc.h>
146 #include <dt-bindings/clock/stm32fx-clock.h>
147 //Example 1 (with st,stm32f4-i2c compatible)
148 i2c@40005400 {
149 compatible = "st,stm32f4-i2c";
150 reg = <0x40005400 0x400>;
151 interrupts = <31>,
152 <32>;
153 resets = <&rcc 277>;
154 clocks = <&rcc 0 149>;
155 #address-cells = <1>;
156 #size-cells = <0>;
157 };
158
159 - |
160 #include <dt-bindings/mfd/stm32f7-rcc.h>
161 #include <dt-bindings/clock/stm32fx-clock.h>
162 //Example 2 (with st,stm32f7-i2c compatible)
163 i2c@40005800 {
164 compatible = "st,stm32f7-i2c";
165 reg = <0x40005800 0x400>;
166 interrupts = <31>,
167 <32>;
168 resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
169 clocks = <&rcc 1 CLK_I2C1>;
170 #address-cells = <1>;
171 #size-cells = <0>;
172 };
173
174 - |
175 #include <dt-bindings/mfd/stm32f7-rcc.h>
176 #include <dt-bindings/clock/stm32fx-clock.h>
177 //Example 3 (with st,stm32mp15-i2c compatible on stm32mp)
178 #include <dt-bindings/interrupt-controller/arm-gic.h>
179 #include <dt-bindings/clock/stm32mp1-clks.h>
180 #include <dt-bindings/reset/stm32mp1-resets.h>
181 i2c@40013000 {
182 compatible = "st,stm32mp15-i2c";
183 reg = <0x40013000 0x400>;
184 interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
185 <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
186 clocks = <&rcc I2C2_K>;
187 resets = <&rcc I2C2_R>;
188 i2c-scl-rising-time-ns = <185>;
189 i2c-scl-falling-time-ns = <20>;
190 st,syscfg-fmp = <&syscfg 0x4 0x2>;
191 #address-cells = <1>;
192 #size-cells = <0>;
193 };
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