mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 17:41:44 +00:00
18f98b1e31
The following patch adds support for the OpenCores I2C controller IP core (See http://www.opencores.org/projects.cgi/web/i2c/overview). Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
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.
|
|
|
|
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,
|
|
},
|
|
};
|
|
|
|
static struct ocores_i2c_platform_data myi2c_data = {
|
|
.regstep = 2, /* two bytes between registers */
|
|
.clock_khz = 50000, /* input clock of 50MHz */
|
|
};
|
|
|
|
static struct platform_device myi2c = {
|
|
.name = "ocores-i2c",
|
|
.dev = {
|
|
.platform_data = &myi2c_data,
|
|
},
|
|
.num_resources = ARRAY_SIZE(ocores_resources),
|
|
.resource = ocores_resources,
|
|
};
|