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I2C for Atmel platforms
Required properties :
- compatible : Must be one of:
"atmel,at91rm9200-i2c",
"atmel,at91sam9261-i2c",
"atmel,at91sam9260-i2c",
"atmel,at91sam9g20-i2c",
"atmel,at91sam9g10-i2c",
"atmel,at91sam9x5-i2c",
"atmel,sama5d4-i2c",
"atmel,sama5d2-i2c",
"microchip,sam9x60-i2c".
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- #address-cells = <1>;
- #size-cells = <0>;
- clocks: phandles to input clocks.
Optional properties:
- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000
- dmas: A list of two dma specifiers, one for each entry in dma-names.
- dma-names: should contain "tx" and "rx".
- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
capable I2C controllers.
- i2c-sda-hold-time-ns: TWD hold time, only available for:
"atmel,sama5d4-i2c",
"atmel,sama5d2-i2c",
"microchip,sam9x60-i2c".
- scl-gpios: specify the gpio related to SCL pin
- sda-gpios: specify the gpio related to SDA pin
- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c
bus recovery, call it "gpio" state
- Child nodes conforming to i2c bus binding
Examples :
i2c0: i2c@fff84000 {
compatible = "atmel,at91sam9g20-i2c";
reg = <0xfff84000 0x100>;
interrupts = <12 4 6>;
#address-cells = <1>;
#size-cells = <0>;
clocks = <&twi0_clk>;
clock-frequency = <400000>;
24c512@50 {
compatible = "atmel,24c512";
reg = <0x50>;
pagesize = <128>;
}
}
i2c0: i2c@f8034600 {
compatible = "atmel,sama5d2-i2c";
reg = <0xf8034600 0x100>;
interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
dmas = <&dma0
(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
AT91_XDMAC_DT_PERID(11)>,
<&dma0
(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
AT91_XDMAC_DT_PERID(12)>;
dma-names = "tx", "rx";
#address-cells = <1>;
#size-cells = <0>;
clocks = <&flx0>;
atmel,fifo-size = <16>;
i2c-sda-hold-time-ns = <336>;
pinctrl-names = "default", "gpio";
pinctrl-0 = <&pinctrl_i2c0>;
pinctrl-1 = <&pinctrl_i2c0_gpio>;
sda-gpios = <&pioA 30 GPIO_ACTIVE_HIGH>;
scl-gpios = <&pioA 31 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
wm8731: wm8731@1a {
compatible = "wm8731";
reg = <0x1a>;
};
};
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