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));
}

二、Platform driver

/* /driver/spi/spi_s3c24xx.c */