The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/soc/fsl/cpm_qe/cpm/i2c.txt

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    1 * I2C
    2 
    3 The I2C controller is expressed as a bus under the CPM node.
    4 
    5 Properties:
    6 - compatible : "fsl,cpm1-i2c", "fsl,cpm2-i2c"
    7 - reg : On CPM2 devices, the second resource doesn't specify the I2C
    8   Parameter RAM itself, but the I2C_BASE field of the CPM2 Parameter RAM
    9   (typically 0x8afc 0x2).
   10 - #address-cells : Should be one. The cell is the i2c device address with
   11   the r/w bit set to zero.
   12 - #size-cells : Should be zero.
   13 - clock-frequency : Can be used to set the i2c clock frequency. If
   14   unspecified, a default frequency of 60kHz is being used.
   15 The following two properties are deprecated. They are only used by legacy
   16 i2c drivers to find the bus to probe:
   17 - linux,i2c-index : Can be used to hard code an i2c bus number. By default,
   18   the bus number is dynamically assigned by the i2c core.
   19 - linux,i2c-class : Can be used to override the i2c class. The class is used
   20   by legacy i2c device drivers to find a bus in a specific context like
   21   system management, video or sound. By default, I2C_CLASS_HWMON (1) is
   22   being used. The definition of the classes can be found in
   23   include/i2c/i2c.h
   24 
   25 Example, based on mpc823:
   26 
   27         i2c@860 {
   28                 compatible = "fsl,mpc823-i2c",
   29                              "fsl,cpm1-i2c";
   30                 reg = <0x860 0x20 0x3c80 0x30>;
   31                 interrupts = <16>;
   32                 interrupt-parent = <&CPM_PIC>;
   33                 fsl,cpm-command = <0x10>;
   34                 #address-cells = <1>;
   35                 #size-cells = <0>;
   36 
   37                 rtc@68 {
   38                         compatible = "dallas,ds1307";
   39                         reg = <0x68>;
   40                 };
   41         };

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