Registration of the s3c2410 device

First, the system is initialized, the registration of the platform bus:

struct device platform_bus = {.bus_id = "platform",};

struct bus_type platform_bus_type = {.name = "platform",.match = platform_match,.suspend = platform_suspend,.resume = platform_resume,};

int __init platform_bus_init(void){device_register(&platform_bus);return bus_register( & platform_bus_type);}

registered
device

static struct platform_device * smdk2410_devices [] __initdata = {& s3c_device_usb, & s3c_device_lcd, & s3c_device_wdt, & s3c_device_i2c, & s3c_device_iis ,};//The structure of these devices is defined in devs.c, as an example: /* NAND Controller */

static struct resource s3c_nand_resource[] = {[0] = {.start = S3C2410_PA_NAND,.end = S3C2410_PA_NAND + S3C24XX_SZ_NAND,.flags = IORESOURCE_MEM,}};

struct platform_device s3c_device_nand = {.name = "s3c2410-nand",.id = -1,.num_resources = ARRAY_SIZE(s3c_nand_res ource) ,. resource = s3c_nand_resource,};

So we can add the device we want by the above method

=============. ======================================= The above list of devices is added to the board-level system static struct s3c24xx_board smdk2410_board __initdata = {.devices = smdk2410_devices, .devices_count = ARRAY_SIZE (smdk2410_devices)};

static void __init smdk2410_map_io (void) {s3c24xx_init_io (smdk2410_iodesc, ARRAY_SIZE (smdk2410_iodesc)); s3c24xx_init_clocks (0); s3c24xx_init_uarts ( smdk2410_uartcfgs, ARRAY_SIZE (smdk2410_uartcfgs)); s3c24xx_set_board (& smdk2410_board); //Note that this step}

static void __init smdk2410_init_irq (void) {s3c24xx_init_irq ();}

==== ======================================== This is a macro to create a structure MACHINE_START (SMDK2410, "SMDK2410") /* @TODO: request a new identifier and switch* to SMDK2410 *//* Maintainer: Jonas Dietsche */.phys_ram = S3C2410_SDRAM_PA,.phys_io = S3C2410_PA_UART,.io_pg_offst = (((u32) S3C24X X_VA_UART) >> 18) & 0xfffc,.boot_params = S3C2410_SDRAM_PA + 0x100,.map_io = smdk2410_map_io,.init_irq = smdk2410_init_irq,.timer = &s3c24xx_timer,MACHINE_END

//The macro is defined as follows: /** Set of macros to define architecture features. This is built into* a table by the linker.*/#define MACHINE_START(_type,_name) \\const struct machine_desc __mach_desc_##_type \\__attribute__((__section__(".arch .info.init"))) = { \\.nr = MACH_TYPE_##_type, \\.name = _name,

#define MACHINE_END \\};

There is a _ named _ _mach_desc_SMDK2410_type, type of structure struct machine_desc

===================== look s3c24xx_set_board. (& smdk2410_board) (in cpu. c)

/* board information */

static struct s3c24xx_board *board;

void s3c24xx_set_board(struct s3c24xx_board *b){int i;

Board = b; //Set this global variable

if (b->clocks_count != 0) {struct clk **ptr = b->clocks;;

for (i = b- & gt; clocks_count; i & gt; 0; i--, ptr ++) s 3c24xx_register_clock(*ptr);}}

The following initialization function will use this variable static int __init s3c_arch_init(void){int ret;

//do the correct init for Cpu

if (cpu == NULL)panic("s3c_arch_init: NULL cpu\ ");

ret = (cpu->init)();if (ret != 0)return ret;

if (board != NULL) {struct platform_device **ptr = board->devices;int i;

//traverse every device in the platform for (i = 0; i < board->devices_count; i++, ptr++) {//Register into the platform bus, so you can find these platform devices when loading the driver. ret = platform_device_register(*ptr );if (ret) {printk(KERN_ERR "s3c24xx: failed to add board device %s (%d)

@%p\ ", (*ptr)->name, ret, * Ptr);}}

/* mask any error, we may not need all these board* devices */ret = 0;}

return ret;}

arch_initcall (s3c_arch_init);

=========================================== =

/*** platform_device_register - add a platform-level device* @pdev: platform device we're adding**/int platform_device_register(struct platform_device * pdev){int i, ret = 0;

if (!pdev)return -EINVAL;

//Associate parent device if (!pdev->dev.parent)pdev->dev.parent = &platform_bus;

pdev->dev.bus = &platform_bus_type;

//id == -1 processing, just the name of the different if (pdev->id != -1)snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev- >name, pdev->id);zh-CN"],null,[0.94743574],zh-CN"]]]