Documentation/i2c/busses/i2c-ocores.rst
Supported adapters:
Author: Peter Korsgaard [email protected]
i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller IP core by Richard Herveille.
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/platform_data/i2c-ocores.h) describing the distance between registers and the input clock speed. There is also a possibility to attach a list of i2c_board_info which the i2c-ocores driver will add to the bus upon creation.
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, }, };
/* optional board info */ struct i2c_board_info ocores_i2c_board_info[] = { { I2C_BOARD_INFO("tsc2003", 0x48), .platform_data = &tsc2003_platform_data, .irq = TSC_IRQ }, { I2C_BOARD_INFO("adv7180", 0x42 >> 1), .irq = ADV_IRQ } };
static struct ocores_i2c_platform_data myi2c_data = { .regstep = 2, /* two bytes between registers / .clock_khz = 50000, / input clock of 50MHz / .devices = ocores_i2c_board_info, / optional table of devices / .num_devices = ARRAY_SIZE(ocores_i2c_board_info), / table size */ };
static struct platform_device myi2c = { .name = "ocores-i2c", .dev = { .platform_data = &myi2c_data, }, .num_resources = ARRAY_SIZE(ocores_resources), .resource = ocores_resources, };