Linux kernel i²c underlying code tracking

Actually, it's about the last platform bus.

In the Arch/arm/mach-mx6/board-mx6q_sabresd.c file

1 Static void__init Mx6_sabresd_board_init (void)                                 2 {                                                                               3 ..... 4strcpy (mxc_i2c0_board_info[0].type,"wm8962"); 5mxc_i2c0_board_info[0].platform_data = &Wm8962_config_data; 6                                                                                 7IMX6Q_ADD_IMX_I2C (0, &mx6q_sabresd_i2c_data); 8IMX6Q_ADD_IMX_I2C (1, &mx6q_sabresd_i2c_data); 9IMX6Q_ADD_IMX_I2C (2, &mx6q_sabresd_i2c_data); Ten .....  One｝

3 I²c buses are added here

Look at the prototype of Mx6q_sabresd_i2c_data.

1 Static struct imxi2c_platform_data mx6q_sabresd_i2c_data = {                    2     //. Bitrate = 100000,                                                        3     400000,                                                          4 };                                                                              

Set the I²C bit rate

Into the inside of the code:

1 #define imx6q_add_imx_i2c (ID, pdata)    \                                       2     imx_add_imx_i2c (&imx6q_imx_i2c_data[ ID], pdata)                             

Inside is a macro definition, obviously, this may be another person writing code, there is a structure

1 extern Const struct

 1  struct   Imx_imx_i2c_data { 2  int   ID;  3   Resour                                                     ce_size_t iobase;                                                      4   resource_size_t Iosize;  5   RESOURC                                                        e_size_t IRQ;                                                                               6 }; 

Re-enter IMX_ADD_IMX_I2C ();

1 structPlatform_device *__init IMX_ADD_IMX_I2C (2         Const structImx_imx_i2c_data *data,3         Const structImxi2c_platform_data *pdata)4 {                                                                               5     structResource res[] = {                                                   6         {                                                                       7. Start = data->Iobase,8. end = Data->iobase + Data->iosize-1,                             9. Flags =Ioresource_mem,Ten         }, {                                                                     One. Start = data->IRQ, A. end = Data->IRQ, -. Flags =Ioresource_irq, -         },                                                                       the     };  -                                                                                  -     returnImx_add_platform_device ("IMX-I2C", data->ID, - Res, array_size (res), +pdatasizeof(*pdata));  -}

Linux kernel i²c underlying code tracking