Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver i2c-ocores 2 3 Supported adapters: 4 * OpenCores.org I2C controller by Richard Herveille (see datasheet link) 5 Datasheet: http://www.opencores.org/projects.cgi/web/i2c/overview 6 7 Author: Peter Korsgaard <jacmet@sunsite.dk> 8 9 Description 10 ----------- 11 12 i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller 13 IP core by Richard Herveille. 14 15 Usage 16 ----- 17 18 i2c-ocores uses the platform bus, so you need to provide a struct 19 platform_device with the base address and interrupt number. The 20 dev.platform_data of the device should also point to a struct 21 ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the 22 distance between registers and the input clock speed. 23 There is also a possibility to attach a list of i2c_board_info which 24 the i2c-ocores driver will add to the bus upon creation. 25 26 E.G. something like: 27 28 static struct resource ocores_resources[] = { 29 [0] = { 30 .start = MYI2C_BASEADDR, 31 .end = MYI2C_BASEADDR + 8, 32 .flags = IORESOURCE_MEM, 33 }, 34 [1] = { 35 .start = MYI2C_IRQ, 36 .end = MYI2C_IRQ, 37 .flags = IORESOURCE_IRQ, 38 }, 39 }; 40 41 /* optional board info */ 42 struct i2c_board_info ocores_i2c_board_info[] = { 43 { 44 I2C_BOARD_INFO("tsc2003", 0x48), 45 .platform_data = &tsc2003_platform_data, 46 .irq = TSC_IRQ 47 }, 48 { 49 I2C_BOARD_INFO("adv7180", 0x42 >> 1), 50 .irq = ADV_IRQ 51 } 52 }; 53 54 static struct ocores_i2c_platform_data myi2c_data = { 55 .regstep = 2, /* two bytes between registers */ 56 .clock_khz = 50000, /* input clock of 50MHz */ 57 .devices = ocores_i2c_board_info, /* optional table of devices */ 58 .num_devices = ARRAY_SIZE(ocores_i2c_board_info), /* table size */ 59 }; 60 61 static struct platform_device myi2c = { 62 .name = "ocores-i2c", 63 .dev = { 64 .platform_data = &myi2c_data, 65 }, 66 .num_resources = ARRAY_SIZE(ocores_resources), 67 .resource = ocores_resources, 68 };