diff options
Diffstat (limited to 'Documentation/i2c/busses/i2c-ocores')
-rw-r--r-- | Documentation/i2c/busses/i2c-ocores | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/Documentation/i2c/busses/i2c-ocores b/Documentation/i2c/busses/i2c-ocores new file mode 100644 index 000000000..9caaf7df1 --- /dev/null +++ b/Documentation/i2c/busses/i2c-ocores @@ -0,0 +1,68 @@ +Kernel driver i2c-ocores + +Supported adapters: + * OpenCores.org I2C controller by Richard Herveille (see datasheet link) + https://opencores.org/project/i2c/overview + +Author: Peter Korsgaard <peter@korsgaard.com> + +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/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, +}; |