| 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, |
| }; |
