S3C2440 SPI驱动框架

S3C2440 SPI驱动代码详细解读：

https://www.linuxidc.com/Linux/2012-08/68402p4.htm

一、platform device and board_info

/* /arch/arm/plat-s3c24xx*/
static struct resource s3c_spi0_resource[] = {    
[0] = {.start = S3C24XX_PA_SPI,.end   = S3C24XX_PA_SPI + 0x1f,.flags = IORESOURCE_MEM,},[1] = {.start = IRQ_SPI0,.end   = IRQ_SPI0,.flags = IORESOURCE_IRQ,}};
static u64 s3c_device_spi0_dmamask = 0xffffffffUL;
struct platform_device s3c_device_spi0 = {.name          = "s3c2410-spi",　　　　　　/* 匹配platform_device 的.driver.namen */.id          = 0,.num_resources      = ARRAY_SIZE(s3c_spi0_resource),.resource      = s3c_spi0_resource,.dev              = {.dma_mask = &s3c_device_spi0_dmamask,.coherent_dma_mask = 0xffffffffUL}
};
EXPORT_SYMBOL(s3c_device_spi0);/* /arch/arm/mach-s3c2440/mach-tq2440.c */
static struct spi_board_info s3c2440_spi0_board[] = {[0] = {.modalias = "spidev",.bus_num        = 0,.chip_select        = 0,.irq =         IRQ_SPI0,    //IRQ_EINT10,/* 修改无效 */.max_speed_hz         = 10*1000*1000,},
};static struct s3c2410_spi_info s3c2440_spi0_platdata = {.pin_cs = S3C2410_GPG2,.num_cs = 1,.bus_num = 0,
};static struct platform_device *tq2440_devices[] __initdata = {......&s3c_device_spi0,            /* sunhj add for spi0 */&s3c_device_spi1,
};
static void __init tq2440_machine_init(void)
{
　　platform_add_devices(tq2440_devices, ARRAY_SIZE(tq2440_devices));
　　/* sunhj add for spi */s3c_device_spi0.dev.platform_data= &s3c2440_spi0_platdata;spi_register_board_info(s3c2440_spi0_board, ARRAY_SIZE(s3c2440_spi0_board));
}