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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/i2c/i2c-at91.txt
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I2C for Atmel platforms

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Required properties :

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- compatible : Must be one of:

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	"atmel,at91rm9200-i2c",

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	"atmel,at91sam9261-i2c",

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	"atmel,at91sam9260-i2c",

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	"atmel,at91sam9g20-i2c",

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	"atmel,at91sam9g10-i2c",

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	"atmel,at91sam9x5-i2c",

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	"atmel,sama5d4-i2c",

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	"atmel,sama5d2-i2c",

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	"microchip,sam9x60-i2c".

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- reg: physical base address of the controller and length of memory mapped

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     region.

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- interrupts: interrupt number to the cpu.

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- #address-cells = <1>;

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- #size-cells = <0>;

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- clocks: phandles to input clocks.

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Optional properties:

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- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000

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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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- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO

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  capable I2C controllers.

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- i2c-sda-hold-time-ns: TWD hold time, only available for:

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	"atmel,sama5d4-i2c",

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	"atmel,sama5d2-i2c",

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	"microchip,sam9x60-i2c".

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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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- Child nodes conforming to i2c bus binding

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Examples :

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i2c0: i2c@fff84000 {

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	compatible = "atmel,at91sam9g20-i2c";

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	reg = <0xfff84000 0x100>;

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	interrupts = <12 4 6>;

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	#address-cells = <1>;

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	#size-cells = <0>;

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	clocks = <&twi0_clk>;

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	clock-frequency = <400000>;

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	24c512@50 {

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		compatible = "atmel,24c512";

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		reg = <0x50>;

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		pagesize = <128>;

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	}

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}

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i2c0: i2c@f8034600 {

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	compatible = "atmel,sama5d2-i2c";

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	reg = <0xf8034600 0x100>;

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	interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;

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	dmas = <&dma0

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		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))

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		AT91_XDMAC_DT_PERID(11)>,

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	       <&dma0

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		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))

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		AT91_XDMAC_DT_PERID(12)>;

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

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	#address-cells = <1>;

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	#size-cells = <0>;

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	clocks = <&flx0>;

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	atmel,fifo-size = <16>;

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	i2c-sda-hold-time-ns = <336>;

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

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	pinctrl-0 = <&pinctrl_i2c0>;

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	pinctrl-1 = <&pinctrl_i2c0_gpio>;

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	sda-gpios = <&pioA 30 GPIO_ACTIVE_HIGH>;

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	scl-gpios = <&pioA 31 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;

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	wm8731: wm8731@1a {

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		compatible = "wm8731";

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		reg = <0x1a>;

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	};

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};

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