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  http://www.wkmic.com/News_Show.php?theId=17

• 驱动首先放在 kernel 3.2.0 driver/spi/ 下面

    //  1.  更名为 wk2124A.h  wk2124A.c//  2. 在 Kconfig 加入如下配置：429 config SPI_WK2124A430     tristate "WK2124A spi to 4 uart drvier"431     depends on SPI432     help433       SPI driver for  wk2124  cs1  spi to 4 wire uart IC driver.// 3 . 在 Makefile 里面加入：61 obj-$(CONFIG_SPI_WK2124A)       += wk2124A.o//  4. 修改驱动源码//  5. 在 头文件中修改：//  修改主次设备号144 #define     SERIAL_WK2124A_MAJOR        190145 #define     CALLOUT_WK2124A_MAJOR       191148 /* am33xx irq   */149 #define GPIO_TO_PIN(bank, gpio) (32 * (bank) + (gpio))150 #define IH2_BASE        32151 #define OMAP_MAX_GPIO_LINES 192152 #define IH_GPIO_BASE        (128 + IH2_BASE)153 #define IH_MPUIO_BASE       (OMAP_MAX_GPIO_LINES + IH_GPIO_BASE)154 #define OMAP_IRQ_END        (IH_MPUIO_BASE + 16)155 #define OMAP_GPIO_IS_MPUIO(nr)  ((nr) >= OMAP_MAX_GPIO_LINES)156 #define OMAP_GPIO_IRQ(nr)   (OMAP_GPIO_IS_MPUIO(nr) ? \157                  IH_MPUIO_BASE + ((nr) & 0x0f) : \158                  IH_GPIO_BASE + (nr))159 160 //wk2xxx hardware configuration161 #define     IRQ_WK2124A             OMAP_GPIO_IRQ(GPIO_TO_PIN(0, 23)) //  这段代码是加入 AM335X 中断的选择//  在 wk2124A.c 里面修改29 #include "wk2124A.h"1476 static struct uart_driver wk2124_uart_driver = {1477     owner:          THIS_MODULE,1478     major:          SERIAL_WK2124A_MAJOR,1479 #ifdef CONFIG_DEVFS_FS1480     driver_name:    "ttySWZA",1481     dev_name:       "ttysWZA",1482 #else1483     driver_name:    "ttySWZA",1484     dev_name:       "ttysWZA",1485 #endif1486     minor:          MINOR_START,1487     nr:             NR_PORTS,1488     cons:           NULL//WK2Xxx_CONSOLE,1489 };1595 static struct spi_driver wk2124A_driver = {1596     .driver = {1597         .name  = "wk2124A",1598         .bus   = &spi_bus_type,1599         .owner = THIS_MODULE,1600     },1601 1602     .probe  = wk2124A_probe,     // 相应的， probe 的名字也要修改1603     .remove = __devexit_p(wk2124_remove),1604     .resume = wk2124_resume,1605 };1607 static int __init wk2124A_init(void)1608 {1609     int retval;1610 1611     retval = spi_register_driver(&wk2124A_driver);1612     printk(KERN_ALERT "rgister spi return v = :%d\n", retval);1613 1614     return retval;1615 }1616 1617 static void __exit wk2124A_exit(void)1618 {1619     spi_unregister_driver(&wk2124A_driver);1620     printk("TEST_REG:quit ");1621 }1622 1623 module_init(wk2124A_init);1624 module_exit(wk2124A_exit);1625 1626 MODULE_AUTHOR("WKIC Ltd");1627 MODULE_DESCRIPTION("wk2xxx generic serial port driver");1628 MODULE_LICENSE("GPL");// 修改 init 函数名字以及 驱动名字

• 在板级文件的 spi_slave 里面加入：

     841 static struct spi_board_info am335x_spi0_slave_info[] = {842 #if 0843     {844         .modalias      = "spidev",845         .max_speed_hz  = 10000000,//48Mbps846         .bus_num       = 1,847         .chip_select   = 0,848         .mode = SPI_MODE_0,849     },850 #endif851 #if 1852     {853         .modalias = "wk2124A",    // compiler854         .mode = SPI_MODE_0,855         .max_speed_hz = 10000000,   // speed 10Mbps856         .bus_num = 1,               //  spi0 bus857         .chip_select = 0,           //  spi_cs0858     },859 #endif860 };