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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/i2c/i2c-imx.txt
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* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX

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Required properties:

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- compatible :

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  - "fsl,imx1-i2c" for I2C compatible with the one integrated on i.MX1 SoC

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  - "fsl,imx21-i2c" for I2C compatible with the one integrated on i.MX21 SoC

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  - "fsl,vf610-i2c" for I2C compatible with the one integrated on Vybrid vf610 SoC

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- reg : Should contain I2C/HS-I2C registers location and length

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- interrupts : Should contain I2C/HS-I2C interrupt

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- clocks : Should contain the I2C/HS-I2C clock specifier

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Optional properties:

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- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.

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  The absence of the property indicates the default frequency 100 kHz.

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- dmas: A list of two dma specifiers, one for each entry in dma-names.

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- dma-names: should contain "tx" and "rx".

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- scl-gpios: specify the gpio related to SCL pin

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- sda-gpios: specify the gpio related to SDA pin

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- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c

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  bus recovery, call it "gpio" state

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Examples:

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i2c@83fc4000 { /* I2C2 on i.MX51 */

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	compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";

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	reg = <0x83fc4000 0x4000>;

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	interrupts = <63>;

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};

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i2c@70038000 { /* HS-I2C on i.MX51 */

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	compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";

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	reg = <0x70038000 0x4000>;

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	interrupts = <64>;

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	clock-frequency = <400000>;

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};

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i2c0: i2c@40066000 { /* i2c0 on vf610 */

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	compatible = "fsl,vf610-i2c";

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	reg = <0x40066000 0x1000>;

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	interrupts =<0 71 0x04>;

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	dmas = <&edma0 0 50>,

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		<&edma0 0 51>;

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	dma-names = "rx","tx";

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	pinctrl-names = "default", "gpio";

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	pinctrl-0 = <&pinctrl_i2c1>;

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	pinctrl-1 = <&pinctrl_i2c1_gpio>;

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	scl-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH>;

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	sda-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;

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};

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