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
7 title: Rockchip RK3xxx I2C controller
8
9 description:
10 This driver interfaces with the native I2C controller present in Rockchip
11 RK3xxx SoCs.
12
13 allOf:
14 - $ref: /schemas/i2c/i2c-controller.yaml#
15
16 maintainers:
17 - Heiko Stuebner <heiko@sntech.de>
18
19 # Everything else is described in the common file
20 properties:
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
106 required:
107 - compatible
108 - reg
109 - interrupts
110 - clocks
111 - clock-names
112
113 if:
114 properties:
115 compatible:
116 contains:
117 enum:
118 - rockchip,rk3066-i2c
119 - rockchip,rk3188-i2c
120
121 then:
122 required:
123 - rockchip,grf
124
125 unevaluatedProperties: false
126
127 examples:
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 };
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