4 U-Boot's I2C model has the concept of an offset within a chip (I2C target
5 device). The offset can be up to 4 bytes long, but is normally 1 byte,
6 meaning that offsets from 0 to 255 are supported by the chip. This often
7 corresponds to register numbers.
9 Apart from the controller-specific I2C bindings, U-Boot supports a special
10 property which allows the chip offset length to be selected.
13 - u-boot,i2c-offset-len - length of chip offset in bytes. If omitted the
14 default value of 1 is used.
15 - u-boot,i2c-transaction-bytes - the length of single I2C transaction on
16 the bus. Some devices require more than single byte transmission
17 (e.g. mc34708 mfd). This information is necessary to correctly
18 initialize (put into idle state) I2C bus after soft reset.
19 - gpios = <sda ...>, <scl ...>;
20 pinctrl-names = "default", "gpio";
21 pinctrl-0 = <&i2c_xfer>;
22 pinctrl-1 = <&i2c_gpio>;
23 Pin description for I2C bus software deblocking.
32 compatible = "google,cros-ec";
33 i2c-max-frequency = <100000>;
34 u-boot,i2c-offset-len = <0>;
35 u-boot,i2c-transaction-bytes = <3>;
36 ec-interrupt = <&gpx1 6 GPIO_ACTIVE_LOW>;
41 pinctrl-names = "default", "gpio";
42 pinctrl-0 = <&i2c1_xfer>;
43 pinctrl-1 = <&i2c1_gpio>;
44 gpios = <&gpio1 26 GPIO_ACTIVE_LOW>, /* SDA */
45 <&gpio1 27 GPIO_ACTIVE_LOW>; /* SCL */