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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