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U-Boot I2C
----------
U-Boot's I2C model has the concept of an offset within a chip (I2C target
device). The offset can be up to 4 bytes long, but is normally 1 byte,
meaning that offsets from 0 to 255 are supported by the chip. This often
corresponds to register numbers.
Apart from the controller-specific I2C bindings, U-Boot supports a special
property which allows the chip offset length to be selected.
Optional properties:
- u-boot,i2c-offset-len - length of chip offset in bytes. If omitted the
default value of 1 is used.
Example
-------
i2c4: i2c@12ca0000 {
cros-ec@1e {
reg = <0x1e>;
compatible = "google,cros-ec";
i2c-max-frequency = <100000>;
u-boot,i2c-offset-len = <0>;
ec-interrupt = <&gpx1 6 GPIO_ACTIVE_LOW>;
};
};
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