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          - const: renesas,rcar-gen3-i2c # R-Car Gen3 and RZ/G2
50
51      - items:
52          - enum:
53              - renesas,i2c-r8a779a0     # R-Car V3U
54              - renesas,i2c-r8a779f0     # R-Car S4-8
55              - renesas,i2c-r8a779g0     # R-Car V4H
56          - const: renesas,rcar-gen4-i2c # R-Car Gen4
57
58  reg:
59    maxItems: 1
60
61  interrupts:
62    maxItems: 1
63
64  clock-frequency:
65    description:
66      Desired I2C bus clock frequency in Hz. The absence of this property
67      indicates the default frequency 100 kHz.
68
69  clocks:
70    maxItems: 1
71
72  power-domains:
73    maxItems: 1
74
75  resets:
76    maxItems: 1
77
78  dmas:
79    minItems: 2
80    maxItems: 4
81    description:
82      Must contain a list of pairs of references to DMA specifiers, one for
83      transmission, and one for reception.
84
85  dma-names:
86    minItems: 2
87    maxItems: 4
88    items:
89      enum:
90        - tx
91        - rx
92
93  i2c-scl-falling-time-ns:
94    default: 35
95    description:
96      Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C
97      specification.
98
99  i2c-scl-internal-delay-ns:
100    default: 50
101    description:
102      Number of nanoseconds the IP core additionally needs to setup SCL.
103
104  i2c-scl-rising-time-ns:
105    default: 200
106    description:
107      Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
108      specification.
109
110required:
111  - compatible
112  - reg
113  - interrupts
114  - clocks
115  - power-domains
116  - '#address-cells'
117  - '#size-cells'
118
119allOf:
120  - $ref: /schemas/i2c/i2c-controller.yaml#
121
122  - if:
123      properties:
124        compatible:
125          contains:
126            enum:
127              - renesas,rcar-gen1-i2c
128              - renesas,rcar-gen2-i2c
129    then:
130      properties:
131        dmas: false
132        dma-names: false
133
134  - if:
135      properties:
136        compatible:
137          contains:
138            enum:
139              - renesas,rcar-gen2-i2c
140              - renesas,rcar-gen3-i2c
141              - renesas,rcar-gen4-i2c
142    then:
143      required:
144        - resets
145
146unevaluatedProperties: false
147
148examples:
149  - |
150    #include <dt-bindings/clock/r8a7791-cpg-mssr.h>
151    #include <dt-bindings/interrupt-controller/arm-gic.h>
152    #include <dt-bindings/power/r8a7791-sysc.h>
153
154    i2c0: i2c@e6508000 {
155            #address-cells = <1>;
156            #size-cells = <0>;
157            compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
158            reg = <0xe6508000 0x40>;
159            interrupts = <GIC_SPI 287 IRQ_TYPE_LEVEL_HIGH>;
160            clock-frequency = <400000>;
161            clocks = <&cpg CPG_MOD 931>;
162            power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
163            resets = <&cpg 931>;
164            i2c-scl-internal-delay-ns = <6>;
165    };
166