Blame view

Documentation/i2c/busses/i2c-ocores 1.75 KB
18f98b1e3   Peter Korsgaard   [PATCH] i2c: New ...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
  Kernel driver i2c-ocores
  
  Supported adapters:
    * OpenCores.org I2C controller by Richard Herveille (see datasheet link)
      Datasheet: http://www.opencores.org/projects.cgi/web/i2c/overview
  
  Author: Peter Korsgaard <jacmet@sunsite.dk>
  
  Description
  -----------
  
  i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller
  IP core by Richard Herveille.
  
  Usage
  -----
  
  i2c-ocores uses the platform bus, so you need to provide a struct
  platform_device with the base address and interrupt number. The
  dev.platform_data of the device should also point to a struct
  ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the
  distance between registers and the input clock speed.
dd14be4c2   Richard Röjfors   i2c-ocores: Can a...
23
24
  There is also a possibility to attach a list of i2c_board_info which
  the i2c-ocores driver will add to the bus upon creation.
18f98b1e3   Peter Korsgaard   [PATCH] i2c: New ...
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
  
  E.G. something like:
  
  static struct resource ocores_resources[] = {
  	[0] = {
  		.start	= MYI2C_BASEADDR,
  		.end	= MYI2C_BASEADDR + 8,
  		.flags	= IORESOURCE_MEM,
  	},
  	[1] = {
  		.start	= MYI2C_IRQ,
  		.end	= MYI2C_IRQ,
  		.flags	= IORESOURCE_IRQ,
  	},
  };
dd14be4c2   Richard Röjfors   i2c-ocores: Can a...
40
41
42
43
44
45
46
47
48
49
50
51
  /* optional board info */
  struct i2c_board_info ocores_i2c_board_info[] = {
  	{
  		I2C_BOARD_INFO("tsc2003", 0x48),
  		.platform_data = &tsc2003_platform_data,
  		.irq = TSC_IRQ
  	},
  	{
  		I2C_BOARD_INFO("adv7180", 0x42 >> 1),
  		.irq = ADV_IRQ
  	}
  };
18f98b1e3   Peter Korsgaard   [PATCH] i2c: New ...
52
53
54
  static struct ocores_i2c_platform_data myi2c_data = {
  	.regstep	= 2,		/* two bytes between registers */
  	.clock_khz	= 50000,	/* input clock of 50MHz */
dd14be4c2   Richard Röjfors   i2c-ocores: Can a...
55
56
  	.devices	= ocores_i2c_board_info, /* optional table of devices */
  	.num_devices	= ARRAY_SIZE(ocores_i2c_board_info), /* table size */
18f98b1e3   Peter Korsgaard   [PATCH] i2c: New ...
57
58
59
60
61
62
63
64
65
66
  };
  
  static struct platform_device myi2c = {
  	.name			= "ocores-i2c",
  	.dev = {
  		.platform_data	= &myi2c_data,
  	},
  	.num_resources		= ARRAY_SIZE(ocores_resources),
  	.resource		= ocores_resources,
  };