1I2C for Atmel platforms
2
3Required properties :
4- compatible : Must be one of:
5	"atmel,at91rm9200-i2c",
6	"atmel,at91sam9261-i2c",
7	"atmel,at91sam9260-i2c",
8	"atmel,at91sam9g20-i2c",
9	"atmel,at91sam9g10-i2c",
10	"atmel,at91sam9x5-i2c",
11	"atmel,sama5d4-i2c",
12	"atmel,sama5d2-i2c",
13	"microchip,sam9x60-i2c".
14- reg: physical base address of the controller and length of memory mapped
15     region.
16- interrupts: interrupt number to the cpu.
17- #address-cells = <1>;
18- #size-cells = <0>;
19- clocks: phandles to input clocks.
20
21Optional properties:
22- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000
23- dmas: A list of two dma specifiers, one for each entry in dma-names.
24- dma-names: should contain "tx" and "rx".
25- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
26  capable I2C controllers.
27- i2c-sda-hold-time-ns: TWD hold time, only available for:
28	"atmel,sama5d4-i2c",
29	"atmel,sama5d2-i2c",
30	"microchip,sam9x60-i2c".
31- scl-gpios: specify the gpio related to SCL pin
32- sda-gpios: specify the gpio related to SDA pin
33- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c
34  bus recovery, call it "gpio" state
35- Child nodes conforming to i2c bus binding
36
37
38Examples :
39
40i2c0: i2c@fff84000 {
41	compatible = "atmel,at91sam9g20-i2c";
42	reg = <0xfff84000 0x100>;
43	interrupts = <12 4 6>;
44	#address-cells = <1>;
45	#size-cells = <0>;
46	clocks = <&twi0_clk>;
47	clock-frequency = <400000>;
48
49	24c512@50 {
50		compatible = "atmel,24c512";
51		reg = <0x50>;
52		pagesize = <128>;
53	}
54}
55
56i2c0: i2c@f8034600 {
57	compatible = "atmel,sama5d2-i2c";
58	reg = <0xf8034600 0x100>;
59	interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
60	dmas = <&dma0
61		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
62		AT91_XDMAC_DT_PERID(11)>,
63	       <&dma0
64		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
65		AT91_XDMAC_DT_PERID(12)>;
66	dma-names = "tx", "rx";
67	#address-cells = <1>;
68	#size-cells = <0>;
69	clocks = <&flx0>;
70	atmel,fifo-size = <16>;
71	i2c-sda-hold-time-ns = <336>;
72	pinctrl-names = "default", "gpio";
73	pinctrl-0 = <&pinctrl_i2c0>;
74	pinctrl-1 = <&pinctrl_i2c0_gpio>;
75	sda-gpios = <&pioA 30 GPIO_ACTIVE_HIGH>;
76	scl-gpios = <&pioA 31 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
77
78	wm8731: wm8731@1a {
79		compatible = "wm8731";
80		reg = <0x1a>;
81	};
82};
83