1* Samsung's I2C controller
2
3The Samsung's I2C controller is used to interface with I2C devices.
4
5Required properties:
6  - compatible: value should be either of the following.
7      (a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
8      (b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
9      (c) "samsung, s3c2440-hdmiphy-i2c", for s3c2440-like i2c used
10          inside HDMIPHY block found on several samsung SoCs
11      (d) "samsung, exynos5440-i2c", for s3c2440-like i2c used
12	   on EXYNOS5440 which does not need GPIO configuration.
13      (e) "samsung, exynos5-sata-phy-i2c", for s3c2440-like i2c used as
14	   a host to SATA PHY controller on an internal bus.
15  - reg: physical base address of the controller and length of memory mapped
16    region.
17  - interrupts: interrupt number to the cpu.
18  - samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
19
20Required for all cases except "samsung,s3c2440-hdmiphy-i2c":
21  - Samsung GPIO variant (deprecated):
22    - gpios: The order of the gpios should be the following: <SDA, SCL>.
23      The gpio specifier depends on the gpio controller. Required in all
24      cases except for "samsung,s3c2440-hdmiphy-i2c" whose input/output
25      lines are permanently wired to the respective clienta
26  - Pinctrl variant (preferred, if available):
27    - pinctrl-0: Pin control group to be used for this controller.
28    - pinctrl-names: Should contain only one value - "default".
29
30Optional properties:
31  - samsung,i2c-slave-addr: Slave address in multi-master environment. If not
32    specified, default value is 0.
33  - samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
34    specified, the default value in Hz is 100000.
35  - samsung,sysreg-phandle - handle to syscon used to control the system registers
36
37Example:
38
39	i2c@13870000 {
40		compatible = "samsung,s3c2440-i2c";
41		reg = <0x13870000 0x100>;
42		interrupts = <345>;
43		samsung,i2c-sda-delay = <100>;
44		samsung,i2c-max-bus-freq = <100000>;
45		/* Samsung GPIO variant begins here */
46		gpios = <&gpd1 2 0 /* SDA */
47			 &gpd1 3 0 /* SCL */>;
48		/* Samsung GPIO variant ends here */
49		/* Pinctrl variant begins here */
50		pinctrl-0 = <&i2c3_bus>;
51		pinctrl-names = "default";
52		/* Pinctrl variant ends here */
53		#address-cells = <1>;
54		#size-cells = <0>;
55
56		wm8994@1a {
57			compatible = "wlf,wm8994";
58			reg = <0x1a>;
59		};
60	};
61