Documentation/devicetree/bindings/i2c/i2c-at91.txt

   1 I2C for Atmel platforms
   2
   3 Required properties :
   4 - compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
   5      "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c",
   6      "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c" or "atmel,sama5d2-i2c"
   7 - reg: physical base address of the controller and length of memory mapped
   8      region.
   9 - interrupts: interrupt number to the cpu.
  10 - #address-cells = <1>;
  11 - #size-cells = <0>;
  12 - clocks: phandles to input clocks.
  13
  14 Optional properties:
  15 - clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000
  16 - dmas: A list of two dma specifiers, one for each entry in dma-names.
  17 - dma-names: should contain "tx" and "rx".
  18 - atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
  19   capable I2C controllers.
  20 - i2c-sda-hold-time-ns: TWD hold time, only available for "atmel,sama5d4-i2c"
  21   and "atmel,sama5d2-i2c".
  22 - Child nodes conforming to i2c bus binding
  23
  24 Examples :
  25
  26 i2c0: i2c@fff84000 {
  27         compatible = "atmel,at91sam9g20-i2c";
  28         reg = <0xfff84000 0x100>;
  29         interrupts = <12 4 6>;
  30         #address-cells = <1>;
  31         #size-cells = <0>;
  32         clocks = <&twi0_clk>;
  33         clock-frequency = <400000>;
  34
  35         24c512@50 {
  36                 compatible = "24c512";
  37                 reg = <0x50>;
  38                 pagesize = <128>;
  39         }
  40 }
  41
  42 i2c0: i2c@f8034600 {
  43         compatible = "atmel,sama5d2-i2c";
  44         reg = <0xf8034600 0x100>;
  45         interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
  46         dmas = <&dma0
  47                 (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
  48                 AT91_XDMAC_DT_PERID(11)>,
  49                <&dma0
  50                 (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
  51                 AT91_XDMAC_DT_PERID(12)>;
  52         dma-names = "tx", "rx";
  53         #address-cells = <1>;
  54         #size-cells = <0>;
  55         clocks = <&flx0>;
  56         atmel,fifo-size = <16>;
  57         i2c-sda-hold-time-ns = <336>;
  58
  59         wm8731: wm8731@1a {
  60                 compatible = "wm8731";
  61                 reg = <0x1a>;
  62         };
  63 };