1.只修改韦老师board_rk3288.c里的寄存器设置就好

2.下面是board_rk3288.c的全部内容，替换原来的内容就好，其它文件不用改：

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/errno.h>

#include <linux/miscdevice.h>

#include <linux/kernel.h>

#include <linux/major.h>

#include <linux/mutex.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <linux/stat.h>

#include <linux/init.h>

#include <linux/device.h>

#include <linux/tty.h>

#include <linux/kmod.h>

#include <linux/gfp.h>

#include <asm/io.h>

#include "led_yellow_opr.h"

static volatile unsigned int *CRU_CLKGATE14_CON;

static volatile unsigned int *GRF_GPIO8A_IOMUX;

static volatile unsigned int *GPIO8_SWPORTA_DDR;

static volatile unsigned int *GPIO8_SWPORTA_DR;

static int board_demo_led_init (int which) /* 初始化LED, which-哪个LED */   

{

if (which == 0)

{

if(!CRU_CLKGATE14_CON)

{

CRU_CLKGATE14_CON = ioremap(0xFF760000 + 0x0198, 4);

GRF_GPIO8A_IOMUX  = ioremap(0xFF770000 + 0x0080, 4);

GPIO8_SWPORTA_DDR = ioremap(0xFF7F0000 + 0x0004, 4);

GPIO8_SWPORTA_DR  = ioremap(0xFF7F0000 + 0x0000, 4);

}

printk("%s %s line %d, led %d\n", __FILE__, __FUNCTION__, __LINE__, which);

// rk3288 GPIO8_A2

/* a. 使能 GPIO8

* set CRU to enable GPIO8

* CRU_CLKGATE14_CON 0xFF760000 + 0x198

* (1<<(8+16)) | (0<<8)

*/

*CRU_CLKGATE14_CON = (1<<(8+16)) | (0<<8);

/* b. 设置 GPIO8_A2 用于 GPIO

  * set PMU/GRF to configure GPIO8_A1 as GPIO

  * GRF_GPIO8A_IOMUX 0xFF770000 + 0x0080

  * bit[3:2] = 0b00

  * (3<<(2+16)) | (0<<2)

  */

  *GRF_GPIO8A_IOMUX = (1<<(4+16)) | (0<<4);

/* c. 设置 GPIO8_A2 作为 output 引脚

* set GPIO_SWPORTA_DDR to configure GPIO8_A1 as output

* GPIO_SWPORTA_DDR 0xFF7F0000 + 0x0004

* bit[1] = 0b1

*/

*GPIO8_SWPORTA_DDR |= (1<<2);

}

return 0;

}

static int board_demo_led_ctl (int which, char status) /* 控制LED, which-哪个LED, status:1-亮,0-灭 */

{

printk("%s %s line %d, led %d, %s\n", __FILE__, __FUNCTION__, __LINE__, which, status ? "on" : "off");

if(which == 0)

{

if(status)//on: output 0

{

/* e. 设置 GPIO8_A2 输出低电平

* set GPIO_SWPORTA_DR to configure GPIO8_A1 output 0

* GPIO_SWPORTA_DR 0xFF7F0000 + 0x0000

* bit[1] = 0b0

*/

*GPIO8_SWPORTA_DR &= ~(1<<2);

}

else//off: output1

{

/* d. 设置 GPIO8_A2 输出高电平

* set GPIO_SWPORTA_DR to configure GPIO8_A1 output 1

* GPIO_SWPORTA_DR 0xFF7F0000 + 0x0000

* bit[1] = 0b1

*/

*GPIO8_SWPORTA_DR |= (1<<2);

}

}

return 0;

}

static struct led_operations board_demo_led_opr = {

.num = 1,

.init = board_demo_led_init,

.ctl  = board_demo_led_ctl,

};

struct led_operations *get_board_led_opr(void)

{

return &board_demo_led_opr;

}