xref: /linux/Documentation/devicetree/bindings/i2c/renesas,rcar-i2c.yaml (revision 0a94608f0f7de9b1135ffea3546afe68eafef57f) 
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      - items:
53          - enum:
54              - renesas,i2c-r8a779f0     # R-Car S4-8
55          - const: renesas,rcar-gen4-i2c # R-Car Gen4
56
57  reg:
58    maxItems: 1
59
60  interrupts:
61    maxItems: 1
62
63  clock-frequency:
64    description:
65      Desired I2C bus clock frequency in Hz. The absence of this property
66      indicates the default frequency 100 kHz.
67
68  clocks:
69    maxItems: 1
70
71  power-domains:
72    maxItems: 1
73
74  resets:
75    maxItems: 1
76
77  dmas:
78    minItems: 2
79    maxItems: 4
80    description:
81      Must contain a list of pairs of references to DMA specifiers, one for
82      transmission, and one for reception.
83
84  dma-names:
85    minItems: 2
86    maxItems: 4
87    items:
88      enum:
89        - tx
90        - rx
91
92  i2c-scl-falling-time-ns:
93    default: 35
94    description:
95      Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C
96      specification.
97
98  i2c-scl-internal-delay-ns:
99    default: 50
100    description:
101      Number of nanoseconds the IP core additionally needs to setup SCL.
102
103  i2c-scl-rising-time-ns:
104    default: 200
105    description:
106      Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
107      specification.
108
109required:
110  - compatible
111  - reg
112  - interrupts
113  - clocks
114  - power-domains
115  - '#address-cells'
116  - '#size-cells'
117
118allOf:
119  - $ref: /schemas/i2c/i2c-controller.yaml#
120
121  - if:
122      properties:
123        compatible:
124          contains:
125            enum:
126              - renesas,rcar-gen1-i2c
127              - renesas,rcar-gen2-i2c
128    then:
129      properties:
130        dmas: false
131        dma-names: false
132
133  - if:
134      properties:
135        compatible:
136          contains:
137            enum:
138              - renesas,rcar-gen2-i2c
139              - renesas,rcar-gen3-i2c
140              - renesas,rcar-gen4-i2c
141    then:
142      required:
143        - resets
144
145unevaluatedProperties: false
146
147examples:
148  - |
149    #include <dt-bindings/clock/r8a7791-cpg-mssr.h>
150    #include <dt-bindings/interrupt-controller/arm-gic.h>
151    #include <dt-bindings/power/r8a7791-sysc.h>
152
153    i2c0: i2c@e6508000 {
154            #address-cells = <1>;
155            #size-cells = <0>;
156            compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
157            reg = <0xe6508000 0x40>;
158            interrupts = <GIC_SPI 287 IRQ_TYPE_LEVEL_HIGH>;
159            clock-frequency = <400000>;
160            clocks = <&cpg CPG_MOD 931>;
161            power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
162            resets = <&cpg 931>;
163            i2c-scl-internal-delay-ns = <6>;
164    };
165