【已解决】pwm申请问题

Chip Platform Rockchip
1

硬件平台：rk3288 reload
软件平台：android 5.1 kernel
1.参照这个帖子http://dev.t-firefly.com/thread-10801-1-1.html 把系统占用的pwm1 驱动给屏蔽掉，参考背光的pwm(kernel/drivers/video/backlight/pwm_bl.c)进行pwm1申请
2.写驱动
1）源码

include<linux/kernel.h>
#include<linux/init.h>
#include<linux/module.h>
#include<linux/delay.h>
#include<linux/pwm.h>
#include<linux/platform_device.h>
#include<linux/err.h>
#include<linux/slab.h>

static int pwm_probe(struct platform_device *pdev)
{
       struct pwm_device *pwm1 = NULL;
       pwm1 = devm_pwm_get(&pdev->dev,NULL);
       if(IS_ERR(pwm1))
       {
             dev_err(&pdev->dev,"unable to get pwm1\n");
             pwm1 = pwm_request(1,"pwm");
             if(IS_ERR(pwm1)){
                    dev_err(&pdev->dev,"unable to request pwm1\n");
                    printk("pwm1 err %ld\n",PTR_ERR(pwm1));
             }
       }
       pwm_config(pwm1,50000,100000);
       pwm_enable(pwm1);
       printk("pwm1 sucess\n");
       return 0;
}

static struct of_device_id pwm_of_match[] = {
        { .compatible = "pwm1_test"},
        {}
};
static int ub_pwm_remove(struct platform_device *pdev)
{
        return 0;
}
static struct platform_driver pwm_driver={
        .driver = {
                .name           ="pwm",
                .owner          =THIS_MODULE,
                .of_match_table = of_match_ptr(pwm_of_match),
        },
        .probe  = pwm_probe,
        .remove = pwm_remove,
};

module_platform_driver(pwm_driver);

MODULE_DESCRIPTION("pwm driver");
MODULE_LICENSE("GPL");

2）dts加入

pwm1_test:pwm1_test{
                compatible="pwm1_test";
                pwms=<&pwm1 0 10000>;
    };

&pwm1 {
        status = "okay";
};