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,rk3588-i2c
42              - rockchip,rv1126-i2c
43          - const: rockchip,rk3399-i2c
44
45  reg:
46    maxItems: 1
47
48  interrupts:
49    maxItems: 1
50
51  clocks:
52    minItems: 1
53    items:
54      - description:
55          For older hardware (rk3066, rk3188, rk3228, rk3288)
56          there is one clock that is used both to derive the functional clock
57          for the device and as the bus clock.
58          For newer hardware (rk3399) this clock is used to derive
59          the functional clock
60      - description:
61          For newer hardware (rk3399) this is the bus clock
62
63  clock-names:
64    minItems: 1
65    items:
66      - const: i2c
67      - const: pclk
68
69  rockchip,grf:
70    $ref: /schemas/types.yaml#/definitions/phandle
71    description:
72      Required on RK3066, RK3188 the phandle of the syscon node for
73      the general register file (GRF)
74      On those SoCs an alias with the correct I2C bus ID
75      (bit offset in the GRF) is also required.
76
77  clock-frequency:
78    default: 100000
79    description:
80      SCL frequency to use (in Hz). If omitted, 100kHz is used.
81
82  i2c-scl-rising-time-ns:
83    default: 1000
84    description:
85      Number of nanoseconds the SCL signal takes to rise
86      (t(r) in I2C specification). If not specified this is assumed to be
87      the maximum the specification allows(1000 ns for Standard-mode,
88      300 ns for Fast-mode) which might cause slightly slower communication.
89
90  i2c-scl-falling-time-ns:
91    default: 300
92    description:
93      Number of nanoseconds the SCL signal takes to fall
94      (t(f) in the I2C specification). If not specified this is assumed to
95      be the maximum the specification allows (300 ns) which might cause
96      slightly slower communication.
97
98  i2c-sda-falling-time-ns:
99    default: 300
100    description:
101      Number of nanoseconds the SDA signal takes to fall
102      (t(f) in the I2C specification). If not specified we will use the SCL
103      value since they are the same in nearly all cases.
104
105required:
106  - compatible
107  - reg
108  - interrupts
109  - clocks
110  - clock-names
111
112if:
113  properties:
114    compatible:
115      contains:
116        enum:
117          - rockchip,rk3066-i2c
118          - rockchip,rk3188-i2c
119
120then:
121  required:
122    - rockchip,grf
123
124unevaluatedProperties: false
125
126examples:
127  - |
128    #include <dt-bindings/clock/rk3188-cru-common.h>
129    #include <dt-bindings/interrupt-controller/arm-gic.h>
130    #include <dt-bindings/interrupt-controller/irq.h>
131    i2c0: i2c@2002d000 {
132      compatible = "rockchip,rk3188-i2c";
133      reg = <0x2002d000 0x1000>;
134      interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
135      clocks = <&cru PCLK_I2C0>;
136      clock-names = "i2c";
137      rockchip,grf = <&grf>;
138      i2c-scl-falling-time-ns = <100>;
139      i2c-scl-rising-time-ns = <800>;
140      #address-cells = <1>;
141      #size-cells = <0>;
142    };
143