Consult: set up a PWM pin in the device tree, the work is normal, but set up two PWM pins, Linux load driver is crashed and unknown folded, equipment the root directory and iomuxc:

 
Fs_pwm {
Compatible="fs_pwm"; 
Pinctrl - names="default"; 
Pinctrl - 0=& lt; & Pinctrl_fspwm & gt;; 
Pwm_power {
PWM - names="pwm_power"; 
PWMS=& lt; & Pwm1 0 50000 & gt;; 
}; 
Pwm_motor {
PWM - names="pwm_motor"; 
PWMS=& lt; & Pwm2 0 50000 & gt;; 
}; 

}; 

 
Pinctrl_fspwm: FSPWMGRP {
FSL, pins=& lt; 
MX6UL_PAD_LCD_DATA00__PWM1_OUT 0 x1b0b0/*/pwm1 & amp; Motor PWM */
MX6UL_PAD_LCD_DATA01__PWM2_OUT 0 x1b0b0/*/pwm1 & amp; Motor PWM */
& gt;; 

Read nodes:

 
Struct pwm_device * pwm_power_dev=NULL;//define PWM device structure 
Struct pwm_device * pwm_motor_dev=NULL; 
*//* lite version prob function 
Static int pwm_power_probe_new (struct platform_device * pdev) 
{
Int ret=0; 
Struct device_node * child; 
Struct device_node * child2; 
Struct device * dev=& amp; Pdev - & gt; Dev. 
Printk (" the match success \ n "); 

The child=of_get_next_child (dev - & gt; Of_node, NULL); 
Printk (" \ "% s " 's child: \ \ "% s" \ n ", dev - & gt; Of_node - & gt; Full_name, child - & gt; Full_name); 
Printk (" % s % s line % d \ r \ n "__FILE__, __FUNCTION__, __LINE__); 
If (child) NULL==
{
Printk (" of_get_next_child error \ r \ n "); 
} 
If (child) 
{
Pwm_power_dev=devm_of_pwm_get (dev, child, NULL); 
If (IS_ERR (pwm_power_dev)) 
{
Printk (KERN_ERR to "pwm_power_dev, get PWM error!!!!! \n"); 
return -1; 
} 

//pwm_motor_dev=devm_of_pwm_get (dev, Chile,) 
} 
The else 
{
Printk (KERN_ERR to "pwm_power_dev of_get_next_child error!!!!! \n"); 
return -1; 
} 

Child2=of_get_next_child (dev - & gt; Of_node, child); 

Printk (" \ "% s " 's child2: \ \ "% s" \ n ", dev - & gt; Of_node - & gt; Full_name, child2 - & gt; Full_name); 
Printk (" \ "% s " 's child2: \ \ "% s" \ n ", dev - & gt; Of_node - & gt; Full_name, child2 - & gt; Full_name); 
Printk (" \ "% s " 's child2: \ \ "% s" \ n ", dev - & gt; Of_node - & gt; Full_name, child2 - & gt; Full_name); 
Printk (" % s % s line % d \ r \ n "__FILE__, __FUNCTION__, __LINE__); 
If (NULL==child2) 
{
Printk (" of_get_next_child2 error \ r \ n "); 
} 
If (child2) 
{
If (IS_ERR (child2)) 
{
Printk (KERN_ERR to "of_get_next_child, child2 error!!!!! \n"); 
return -1; 
} 

Printk (" \ "% s " 's devm_of_pwm_get: \ \ "% s" \ n ", dev - & gt; Of_node - & gt; Full_name, child2 - & gt; Full_name); 
Pwm_motor_dev=devm_of_pwm_get (dev, child2, NULL);//* * * * this code crashes, no longer run down 

If (IS_ERR (pwm_motor_dev)) 
{
Printk (KERN_ERR to "pwm_power_dev, get PWM error!!!!! \n"); 
return -1; 
} 
} 
The else 
{
Printk (KERN_ERR to "pwm_power_dev of_get_next_child error!!!!! \n"); 
return -1; 
} 

Printk (" set pwm_power... \r\n"); 

/* configuration frequency of 100 KHZ duty ratio 80% */
Ret=pwm_config (pwm_power_dev, 1000, 5000); 
Printk (" ret: % d \ r \ n ", ret); 
/* inverting frequency of 100 KHZ duty ratio 20% */
Ret=pwm_set_polarity (pwm_power_dev PWM_POLARITY_INVERSED); 
Printk (" ret: % d \ r \ n ", ret); 
Ret=pwm_enable (pwm_power_dev); 
Printk (" ret: % d \ r \ n ", ret); 

Printk (" set pwm_motor... \r\n"); 
/* configuration frequency of 100 KHZ duty ratio 80% */
Ret=pwm_config (pwm_motor_dev, 1000, 5000); 
Printk (" ret: % d \ r \ n ", ret); 
/* inverting frequency of 100 KHZ duty ratio 20% */
Ret=pwm_set_polarity (pwm_motor_dev PWM_POLARITY_NORMAL); 
Printk (" ret: % d \ r \ n ", ret); 
Ret=pwm_enable (pwm_motor_dev); 
Printk (" ret: % d \ r \ n ", ret); 

Return ret. 
}