i2c-s3c2410.txt

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

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sys/contrib/device-tree/Bindings/i2c/i2c-s3c2410.txt