1* Synopsys DesignWare I2C
2
3Required properties :
4
5 - compatible : should be "snps,designware-i2c"
6                or "mscc,ocelot-i2c" with "snps,designware-i2c" for fallback
7 - reg : Offset and length of the register set for the device
8 - interrupts : <IRQ> where IRQ is the interrupt number.
9 - clocks : phandles for the clocks, see the description of clock-names below.
10   The phandle for the "ic_clk" clock is required. The phandle for the "pclk"
11   clock is optional. If a single clock is specified but no clock-name, it is
12   the "ic_clk" clock. If both clocks are listed, the "ic_clk" must be first.
13
14Recommended properties :
15
16 - clock-frequency : desired I2C bus clock frequency in Hz.
17
18Optional properties :
19
20 - clock-names : Contains the names of the clocks:
21    "ic_clk", for the core clock used to generate the external I2C clock.
22    "pclk", the interface clock, required for register access.
23
24 - reg : for "mscc,ocelot-i2c", a second register set to configure the SDA hold
25   time, named ICPU_CFG:TWI_DELAY in the datasheet.
26
27 - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
28   This option is only supported in hardware blocks version 1.11a or newer and
29   on Microsemi SoCs ("mscc,ocelot-i2c" compatible).
30
31 - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds.
32   This value which is by default 300ns is used to compute the tLOW period.
33
34 - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds.
35   This value which is by default 300ns is used to compute the tHIGH period.
36
37Examples :
38
39	i2c@f0000 {
40		#address-cells = <1>;
41		#size-cells = <0>;
42		compatible = "snps,designware-i2c";
43		reg = <0xf0000 0x1000>;
44		interrupts = <11>;
45		clock-frequency = <400000>;
46	};
47
48	i2c@1120000 {
49		#address-cells = <1>;
50		#size-cells = <0>;
51		compatible = "snps,designware-i2c";
52		reg = <0x1120000 0x1000>;
53		interrupt-parent = <&ictl>;
54		interrupts = <12 1>;
55		clock-frequency = <400000>;
56		i2c-sda-hold-time-ns = <300>;
57		i2c-sda-falling-time-ns = <300>;
58		i2c-scl-falling-time-ns = <300>;
59	};x
60
61	i2c@1120000 {
62		#address-cells = <1>;
63		#size-cells = <0>;
64		reg = <0x2000 0x100>;
65		clock-frequency = <400000>;
66		clocks = <&i2cclk>;
67		interrupts = <0>;
68
69		eeprom@64 {
70			compatible = "linux,slave-24c02";
71			reg = <0x40000064>;
72		};
73	};
74