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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/i2c/i2c-mpc.txt
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* I2C

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Required properties :

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 - reg : Offset and length of the register set for the device

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 - compatible : should be "fsl,CHIP-i2c" where CHIP is the name of a

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   compatible processor, e.g. mpc8313, mpc8543, mpc8544, mpc5121,

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   mpc5200 or mpc5200b. For the mpc5121, an additional node

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   "fsl,mpc5121-i2c-ctrl" is required as shown in the example below.

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Recommended properties :

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 - interrupts : <a b> where a is the interrupt number and b is a

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   field that represents an encoding of the sense and level

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   information for the interrupt.  This should be encoded based on

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   the information in section 2) depending on the type of interrupt

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   controller you have.

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 - fsl,preserve-clocking : boolean; if defined, the clock settings

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   from the bootloader are preserved (not touched).

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 - clock-frequency : desired I2C bus clock frequency in Hz.

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 - fsl,timeout : I2C bus timeout in microseconds.

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Examples :

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	/* MPC5121 based board */

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	i2c@1740 {

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		#address-cells = <1>;

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		#size-cells = <0>;

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		compatible = "fsl,mpc5121-i2c", "fsl-i2c";

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		reg = <0x1740 0x20>;

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		interrupts = <11 0x8>;

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		interrupt-parent = <&ipic>;

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		clock-frequency = <100000>;

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	};

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	i2ccontrol@1760 {

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		compatible = "fsl,mpc5121-i2c-ctrl";

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		reg = <0x1760 0x8>;

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	};

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	/* MPC5200B based board */

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	i2c@3d00 {

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		#address-cells = <1>;

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		#size-cells = <0>;

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		compatible = "fsl,mpc5200b-i2c","fsl,mpc5200-i2c","fsl-i2c";

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		reg = <0x3d00 0x40>;

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		interrupts = <2 15 0>;

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		interrupt-parent = <&mpc5200_pic>;

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		fsl,preserve-clocking;

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	};

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	/* MPC8544 base board */

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	i2c@3100 {

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		#address-cells = <1>;

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		#size-cells = <0>;

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		compatible = "fsl,mpc8544-i2c", "fsl-i2c";

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		reg = <0x3100 0x100>;

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		interrupts = <43 2>;

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		interrupt-parent = <&mpic>;

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		clock-frequency = <400000>;

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		fsl,timeout = <10000>;

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	};

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