1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/i2c/i2c-rk3x.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Rockchip RK3xxx I2C controller
8
9description:
10  This driver interfaces with the native I2C controller present in Rockchip
11  RK3xxx SoCs.
12
13allOf:
14  - $ref: /schemas/i2c/i2c-controller.yaml#
15
16maintainers:
17  - Heiko Stuebner <heiko@sntech.de>
18
19# Everything else is described in the common file
20properties:
21  compatible:
22    oneOf:
23      - const: rockchip,rv1108-i2c
24      - const: rockchip,rk3066-i2c
25      - const: rockchip,rk3188-i2c
26      - const: rockchip,rk3228-i2c
27      - const: rockchip,rk3288-i2c
28      - const: rockchip,rk3399-i2c
29      - items:
30          - enum:
31              - rockchip,rk3036-i2c
32              - rockchip,rk3128-i2c
33              - rockchip,rk3368-i2c
34          - const: rockchip,rk3288-i2c
35      - items:
36          - enum:
37              - rockchip,px30-i2c
38              - rockchip,rk3308-i2c
39              - rockchip,rk3328-i2c
40              - rockchip,rk3568-i2c
41              - rockchip,rk3576-i2c
42              - rockchip,rk3588-i2c
43              - rockchip,rv1126-i2c
44          - const: rockchip,rk3399-i2c
45
46  reg:
47    maxItems: 1
48
49  interrupts:
50    maxItems: 1
51
52  clocks:
53    minItems: 1
54    items:
55      - description:
56          For older hardware (rk3066, rk3188, rk3228, rk3288)
57          there is one clock that is used both to derive the functional clock
58          for the device and as the bus clock.
59          For newer hardware (rk3399) this clock is used to derive
60          the functional clock
61      - description:
62          For newer hardware (rk3399) this is the bus clock
63
64  clock-names:
65    minItems: 1
66    items:
67      - const: i2c
68      - const: pclk
69
70  rockchip,grf:
71    $ref: /schemas/types.yaml#/definitions/phandle
72    description:
73      Required on RK3066, RK3188 the phandle of the syscon node for
74      the general register file (GRF)
75      On those SoCs an alias with the correct I2C bus ID
76      (bit offset in the GRF) is also required.
77
78  clock-frequency:
79    default: 100000
80    description:
81      SCL frequency to use (in Hz). If omitted, 100kHz is used.
82
83  i2c-scl-rising-time-ns:
84    default: 1000
85    description:
86      Number of nanoseconds the SCL signal takes to rise
87      (t(r) in I2C specification). If not specified this is assumed to be
88      the maximum the specification allows(1000 ns for Standard-mode,
89      300 ns for Fast-mode) which might cause slightly slower communication.
90
91  i2c-scl-falling-time-ns:
92    default: 300
93    description:
94      Number of nanoseconds the SCL signal takes to fall
95      (t(f) in the I2C specification). If not specified this is assumed to
96      be the maximum the specification allows (300 ns) which might cause
97      slightly slower communication.
98
99  i2c-sda-falling-time-ns:
100    default: 300
101    description:
102      Number of nanoseconds the SDA signal takes to fall
103      (t(f) in the I2C specification). If not specified we will use the SCL
104      value since they are the same in nearly all cases.
105
106required:
107  - compatible
108  - reg
109  - interrupts
110  - clocks
111  - clock-names
112
113if:
114  properties:
115    compatible:
116      contains:
117        enum:
118          - rockchip,rk3066-i2c
119          - rockchip,rk3188-i2c
120
121then:
122  required:
123    - rockchip,grf
124
125unevaluatedProperties: false
126
127examples:
128  - |
129    #include <dt-bindings/clock/rk3188-cru-common.h>
130    #include <dt-bindings/interrupt-controller/arm-gic.h>
131    #include <dt-bindings/interrupt-controller/irq.h>
132    i2c0: i2c@2002d000 {
133      compatible = "rockchip,rk3188-i2c";
134      reg = <0x2002d000 0x1000>;
135      interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
136      clocks = <&cru PCLK_I2C0>;
137      clock-names = "i2c";
138      rockchip,grf = <&grf>;
139      i2c-scl-falling-time-ns = <100>;
140      i2c-scl-rising-time-ns = <800>;
141      #address-cells = <1>;
142      #size-cells = <0>;
143    };
144