tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1I2C for Atmel platforms
2
3Required 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" 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
14Optional 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- Child nodes conforming to i2c bus binding
21
22Examples :
23
24i2c0: i2c@fff84000 {
25 compatible = "atmel,at91sam9g20-i2c";
26 reg = <0xfff84000 0x100>;
27 interrupts = <12 4 6>;
28 #address-cells = <1>;
29 #size-cells = <0>;
30 clocks = <&twi0_clk>;
31 clock-frequency = <400000>;
32
33 24c512@50 {
34 compatible = "24c512";
35 reg = <0x50>;
36 pagesize = <128>;
37 }
38}
39
40i2c0: i2c@f8034600 {
41 compatible = "atmel,sama5d2-i2c";
42 reg = <0xf8034600 0x100>;
43 interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
44 dmas = <&dma0
45 (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
46 AT91_XDMAC_DT_PERID(11)>,
47 <&dma0
48 (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1))
49 AT91_XDMAC_DT_PERID(12)>;
50 dma-names = "tx", "rx";
51 #address-cells = <1>;
52 #size-cells = <0>;
53 clocks = <&flx0>;
54 atmel,fifo-size = <16>;
55
56 wm8731: wm8731@1a {
57 compatible = "wm8731";
58 reg = <0x1a>;
59 };
60};