| 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>; |
| }; |
| }; |
