1Kernel driver i2c-ocores
2
3Supported adapters:
4  * OpenCores.org I2C controller by Richard Herveille (see datasheet link)
5    https://opencores.org/project/i2c/overview
6
7Author: Peter Korsgaard <peter@korsgaard.com>
8
9Description
10-----------
11
12i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller
13IP core by Richard Herveille.
14
15Usage
16-----
17
18i2c-ocores uses the platform bus, so you need to provide a struct
19platform_device with the base address and interrupt number. The
20dev.platform_data of the device should also point to a struct
21ocores_i2c_platform_data (see linux/platform_data/i2c-ocores.h) describing the
22distance between registers and the input clock speed.
23There is also a possibility to attach a list of i2c_board_info which
24the i2c-ocores driver will add to the bus upon creation.
25
26E.G. something like:
27
28static struct resource ocores_resources[] = {
29	[0] = {
30		.start	= MYI2C_BASEADDR,
31		.end	= MYI2C_BASEADDR + 8,
32		.flags	= IORESOURCE_MEM,
33	},
34	[1] = {
35		.start	= MYI2C_IRQ,
36		.end	= MYI2C_IRQ,
37		.flags	= IORESOURCE_IRQ,
38	},
39};
40
41/* optional board info */
42struct i2c_board_info ocores_i2c_board_info[] = {
43	{
44		I2C_BOARD_INFO("tsc2003", 0x48),
45		.platform_data = &tsc2003_platform_data,
46		.irq = TSC_IRQ
47	},
48	{
49		I2C_BOARD_INFO("adv7180", 0x42 >> 1),
50		.irq = ADV_IRQ
51	}
52};
53
54static struct ocores_i2c_platform_data myi2c_data = {
55	.regstep	= 2,		/* two bytes between registers */
56	.clock_khz	= 50000,	/* input clock of 50MHz */
57	.devices	= ocores_i2c_board_info, /* optional table of devices */
58	.num_devices	= ARRAY_SIZE(ocores_i2c_board_info), /* table size */
59};
60
61static struct platform_device myi2c = {
62	.name			= "ocores-i2c",
63	.dev = {
64		.platform_data	= &myi2c_data,
65	},
66	.num_resources		= ARRAY_SIZE(ocores_resources),
67	.resource		= ocores_resources,
68};
69