1* Rockchip RK3xxx I2C controller
2
3This driver interfaces with the native I2C controller present in Rockchip
4RK3xxx SoCs.
5
6Required properties :
7
8 - reg : Offset and length of the register set for the device
9 - compatible: should be one of the following:
10   - "rockchip,rv1108-i2c": for rv1108
11   - "rockchip,rk3066-i2c": for rk3066
12   - "rockchip,rk3188-i2c": for rk3188
13   - "rockchip,rk3228-i2c": for rk3228
14   - "rockchip,rk3288-i2c": for rk3288
15   - "rockchip,rk3328-i2c", "rockchip,rk3399-i2c": for rk3328
16   - "rockchip,rk3399-i2c": for rk3399
17 - interrupts : interrupt number
18 - clocks: See ../clock/clock-bindings.txt
19   - For older hardware (rk3066, rk3188, rk3228, rk3288):
20     - There is one clock that's used both to derive the functional clock
21       for the device and as the bus clock.
22   - For newer hardware (rk3399): specified by name
23     - "i2c": This is used to derive the functional clock.
24     - "pclk": This is the bus clock.
25
26Required on RK3066, RK3188 :
27
28 - rockchip,grf : the phandle of the syscon node for the general register
29		  file (GRF)
30 - on those SoCs an alias with the correct I2C bus ID (bit offset in the GRF)
31   is also required.
32
33Optional properties :
34
35 - clock-frequency : SCL frequency to use (in Hz). If omitted, 100kHz is used.
36 - i2c-scl-rising-time-ns : Number of nanoseconds the SCL signal takes to rise
37	(t(r) in I2C specification). If not specified this is assumed to be
38	the maximum the specification allows(1000 ns for Standard-mode,
39	300 ns for Fast-mode) which might cause slightly slower communication.
40 - i2c-scl-falling-time-ns : Number of nanoseconds the SCL signal takes to fall
41	(t(f) in the I2C specification). If not specified this is assumed to
42	be the maximum the specification allows (300 ns) which might cause
43	slightly slower communication.
44 - i2c-sda-falling-time-ns : Number of nanoseconds the SDA signal takes to fall
45	(t(f) in the I2C specification). If not specified we'll use the SCL
46	value since they are the same in nearly all cases.
47
48Example:
49
50aliases {
51	i2c0 = &i2c0;
52}
53
54i2c0: i2c@2002d000 {
55	compatible = "rockchip,rk3188-i2c";
56	reg = <0x2002d000 0x1000>;
57	interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
58	#address-cells = <1>;
59	#size-cells = <0>;
60
61	rockchip,grf = <&grf>;
62
63	clock-names = "i2c";
64	clocks = <&cru PCLK_I2C0>;
65
66	i2c-scl-rising-time-ns = <800>;
67	i2c-scl-falling-time-ns = <100>;
68};
69