aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/i2c/busses/i2c-ocores51
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/i2c/busses/i2c-ocores b/Documentation/i2c/busses/i2c-ocores
new file mode 100644
index 00000000000..cfcebb10d14
--- /dev/null
+++ b/Documentation/i2c/busses/i2c-ocores
@@ -0,0 +1,51 @@
1Kernel driver i2c-ocores
2
3Supported adapters:
4 * OpenCores.org I2C controller by Richard Herveille (see datasheet link)
5 Datasheet: http://www.opencores.org/projects.cgi/web/i2c/overview
6
7Author: Peter Korsgaard <jacmet@sunsite.dk>
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/i2c-ocores.h) describing the
22distance between registers and the input clock speed.
23
24E.G. something like:
25
26static struct resource ocores_resources[] = {
27 [0] = {
28 .start = MYI2C_BASEADDR,
29 .end = MYI2C_BASEADDR + 8,
30 .flags = IORESOURCE_MEM,
31 },
32 [1] = {
33 .start = MYI2C_IRQ,
34 .end = MYI2C_IRQ,
35 .flags = IORESOURCE_IRQ,
36 },
37};
38
39static struct ocores_i2c_platform_data myi2c_data = {
40 .regstep = 2, /* two bytes between registers */
41 .clock_khz = 50000, /* input clock of 50MHz */
42};
43
44static struct platform_device myi2c = {
45 .name = "ocores-i2c",
46 .dev = {
47 .platform_data = &myi2c_data,
48 },
49 .num_resources = ARRAY_SIZE(ocores_resources),
50 .resource = ocores_resources,
51};