xref: /linux/Documentation/devicetree/bindings/i2c/renesas,rcar-i2c.yaml (revision bdd1a21b52557ea8f61d0a5dc2f77151b576eb70) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/i2c/renesas,rcar-i2c.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Renesas R-Car I2C Controller
8
9maintainers:
10  - Wolfram Sang <wsa+renesas@sang-engineering.com>
11
12properties:
13  compatible:
14    oneOf:
15      - items:
16          - enum:
17              - renesas,i2c-r8a7778      # R-Car M1A
18              - renesas,i2c-r8a7779      # R-Car H1
19          - const: renesas,rcar-gen1-i2c # R-Car Gen1
20
21      - items:
22          - enum:
23              - renesas,i2c-r8a7742      # RZ/G1H
24              - renesas,i2c-r8a7743      # RZ/G1M
25              - renesas,i2c-r8a7744      # RZ/G1N
26              - renesas,i2c-r8a7745      # RZ/G1E
27              - renesas,i2c-r8a77470     # RZ/G1C
28              - renesas,i2c-r8a7790      # R-Car H2
29              - renesas,i2c-r8a7791      # R-Car M2-W
30              - renesas,i2c-r8a7792      # R-Car V2H
31              - renesas,i2c-r8a7793      # R-Car M2-N
32              - renesas,i2c-r8a7794      # R-Car E2
33          - const: renesas,rcar-gen2-i2c # R-Car Gen2 and RZ/G1
34
35      - items:
36          - enum:
37              - renesas,i2c-r8a774a1     # RZ/G2M
38              - renesas,i2c-r8a774b1     # RZ/G2N
39              - renesas,i2c-r8a774c0     # RZ/G2E
40              - renesas,i2c-r8a774e1     # RZ/G2H
41              - renesas,i2c-r8a7795      # R-Car H3
42              - renesas,i2c-r8a7796      # R-Car M3-W
43              - renesas,i2c-r8a77961     # R-Car M3-W+
44              - renesas,i2c-r8a77965     # R-Car M3-N
45              - renesas,i2c-r8a77970     # R-Car V3M
46              - renesas,i2c-r8a77980     # R-Car V3H
47              - renesas,i2c-r8a77990     # R-Car E3
48              - renesas,i2c-r8a77995     # R-Car D3
49              - renesas,i2c-r8a779a0     # R-Car V3U
50          - const: renesas,rcar-gen3-i2c # R-Car Gen3 and RZ/G2
51
52  reg:
53    maxItems: 1
54
55  interrupts:
56    maxItems: 1
57
58  clock-frequency:
59    description:
60      Desired I2C bus clock frequency in Hz. The absence of this property
61      indicates the default frequency 100 kHz.
62
63  clocks:
64    maxItems: 1
65
66  power-domains:
67    maxItems: 1
68
69  resets:
70    maxItems: 1
71
72  dmas:
73    minItems: 2
74    maxItems: 4
75    description:
76      Must contain a list of pairs of references to DMA specifiers, one for
77      transmission, and one for reception.
78
79  dma-names:
80    minItems: 2
81    maxItems: 4
82    items:
83      enum:
84        - tx
85        - rx
86
87  i2c-scl-falling-time-ns:
88    default: 35
89    description:
90      Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C
91      specification.
92
93  i2c-scl-internal-delay-ns:
94    default: 50
95    description:
96      Number of nanoseconds the IP core additionally needs to setup SCL.
97
98  i2c-scl-rising-time-ns:
99    default: 200
100    description:
101      Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
102      specification.
103
104required:
105  - compatible
106  - reg
107  - interrupts
108  - clocks
109  - power-domains
110  - '#address-cells'
111  - '#size-cells'
112
113allOf:
114  - $ref: /schemas/i2c/i2c-controller.yaml#
115
116  - if:
117      properties:
118        compatible:
119          contains:
120            enum:
121              - renesas,rcar-gen1-i2c
122              - renesas,rcar-gen2-i2c
123    then:
124      properties:
125        dmas: false
126        dma-names: false
127
128  - if:
129      properties:
130        compatible:
131          contains:
132            enum:
133              - renesas,rcar-gen2-i2c
134              - renesas,rcar-gen3-i2c
135    then:
136      required:
137        - resets
138
139unevaluatedProperties: false
140
141examples:
142  - |
143    #include <dt-bindings/clock/r8a7791-cpg-mssr.h>
144    #include <dt-bindings/interrupt-controller/arm-gic.h>
145    #include <dt-bindings/power/r8a7791-sysc.h>
146
147    i2c0: i2c@e6508000 {
148            #address-cells = <1>;
149            #size-cells = <0>;
150            compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
151            reg = <0xe6508000 0x40>;
152            interrupts = <GIC_SPI 287 IRQ_TYPE_LEVEL_HIGH>;
153            clock-frequency = <400000>;
154            clocks = <&cpg CPG_MOD 931>;
155            power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
156            resets = <&cpg 931>;
157            i2c-scl-internal-delay-ns = <6>;
158    };
159