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18f98b1e PK |
1 | Kernel driver i2c-ocores |
2 | ||
3 | Supported adapters: | |
4 | * OpenCores.org I2C controller by Richard Herveille (see datasheet link) | |
5 | Datasheet: http://www.opencores.org/projects.cgi/web/i2c/overview | |
6 | ||
7 | Author: Peter Korsgaard <jacmet@sunsite.dk> | |
8 | ||
9 | Description | |
10 | ----------- | |
11 | ||
12 | i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller | |
13 | IP core by Richard Herveille. | |
14 | ||
15 | Usage | |
16 | ----- | |
17 | ||
18 | i2c-ocores uses the platform bus, so you need to provide a struct | |
19 | platform_device with the base address and interrupt number. The | |
20 | dev.platform_data of the device should also point to a struct | |
21 | ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the | |
22 | distance between registers and the input clock speed. | |
dd14be4c RR |
23 | There is also a possibility to attach a list of i2c_board_info which |
24 | the i2c-ocores driver will add to the bus upon creation. | |
18f98b1e PK |
25 | |
26 | E.G. something like: | |
27 | ||
28 | static 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 | ||
dd14be4c RR |
41 | /* optional board info */ |
42 | struct 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 | ||
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54 | static struct ocores_i2c_platform_data myi2c_data = { |
55 | .regstep = 2, /* two bytes between registers */ | |
56 | .clock_khz = 50000, /* input clock of 50MHz */ | |
dd14be4c RR |
57 | .devices = ocores_i2c_board_info, /* optional table of devices */ |
58 | .num_devices = ARRAY_SIZE(ocores_i2c_board_info), /* table size */ | |
18f98b1e PK |
59 | }; |
60 | ||
61 | static 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 | }; |