Linux/PROCESSOR-SDK-AM437X: How to config gpio in device tree and used in driver

Hi Pavel,

I want to use gpio5_8, gpio5_9,gpio5_10,gpio5_11,gpio5_13,gpio5_6. I use function of_get_named_gpio()(GPIO_FPGA_nSTATUS = of_get_named_gpio(node,"fpga",0)) to get gpio in driver program the first time and it also return with -517.

// GPIO_FPGA_nSTATUS = of_get_named_gpio(node,"fpga",0);//,&flag);//&flag);
GPIO_FPGA_nSTATUS = 32*5+8;
if(!gpio_is_valid(GPIO_FPGA_nSTATUS)){
printk("probe gpio failed1 %d!\n",GPIO_FPGA_nSTATUS);
return -1;
}
if((ret = gpio_request(GPIO_FPGA_nSTATUS,"nSTATUS"))){
printk("request gpio failed1! %d\n", ret);
return -1;
}
// GPIO_FPGA_nDCLK = of_get_named_gpio(node,"fpga",1);//,NULL);//&flag);
GPIO_FPGA_nDCLK = 32*5+9;
if(!gpio_is_valid(GPIO_FPGA_nDCLK)){
gpio_free(GPIO_FPGA_nSTATUS);
printk("probe gpio failed2!\n");
return -1;
}
if(gpio_request(GPIO_FPGA_nSTATUS,"nDCLK")){
gpio_free(GPIO_FPGA_nSTATUS);
printk("request gpio failed2!\n");
return -1;
}
// GPIO_FPGA_DATA0 = of_get_named_gpio(node,"fpga",2);//,NULL);//&flag);
GPIO_FPGA_DATA0 = 32*5+10;
if(!gpio_is_valid(GPIO_FPGA_DATA0)){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
printk("probe gpio failed3!\n");
return -1;
}
if(gpio_request(GPIO_FPGA_DATA0,"DATA0")){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
printk("request gpio failed3!\n");
return -1;
}
// GPIO_FPGA_nCONFIG = of_get_named_gpio(node,"fpga",3);//,NULL);//&flag);
GPIO_FPGA_nCONFIG = 32*5+11;
if(!gpio_is_valid(GPIO_FPGA_nCONFIG)){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
printk("probe gpio failed4!\n");
return -1;
}
if(gpio_request(GPIO_FPGA_nCONFIG,"nCONFIG")){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
printk("request gpio failed4!\n");
return -1;
}
// GPIO_FPGA_CONFIG_DONE = of_get_named_gpio(node,"fpga",4);//,NULL);//&flag);
GPIO_FPGA_CONFIG_DONE = 32*5+13;
if(!gpio_is_valid(GPIO_FPGA_CONFIG_DONE)){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
gpio_free(GPIO_FPGA_nCONFIG);
printk("probe gpio failed5!\n");
return -1;
}
if(gpio_request(GPIO_FPGA_CONFIG_DONE,"fpga,CONFIG_DONE")){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
gpio_free(GPIO_FPGA_nCONFIG);
printk("request gpio failed5!\n");
return -1;
}
// GPIO_FPGA_RESET = of_get_named_gpio(node,"fpga",5);//,NULL);//&flag);
GPIO_FPGA_RESET = 5*32+6;
if(!gpio_is_valid(GPIO_FPGA_RESET)){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
gpio_free(GPIO_FPGA_nCONFIG);
gpio_free(GPIO_FPGA_CONFIG_DONE);
printk("probe gpio failed6!\n");
return -1;
}
if(gpio_request(GPIO_FPGA_RESET,"RESET")){
gpio_free(GPIO_FPGA_nSTATUS);
gpio_free(GPIO_FPGA_nDCLK);
gpio_free(GPIO_FPGA_DATA0);
gpio_free(GPIO_FPGA_nCONFIG);
gpio_free(GPIO_FPGA_CONFIG_DONE);
printk("request gpio failed6!\n");
return -1;
}


in the DTS file, I define node as:

FPGA_Load_pins {
compatible = "cr,fpgaload";
status = "okay";

pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fpga_load>;

fpga-gpios = <&gpio5 8 GPIO_ACTIVE_HIGH>, //nSTATUS
<&gpio5 9 GPIO_ACTIVE_HIGH>, //nDCLK
<&gpio5 10 GPIO_ACTIVE_HIGH>, //DATA0
<&gpio5 11 GPIO_ACTIVE_HIGH>, //nCONFIG
<&gpio5 13 GPIO_ACTIVE_HIGH>, //CONFIG_DONE
<&gpio5 6 GPIO_ACTIVE_LOW>; //RESET

};


I cann't get answer from your reference example. So this time I use gpio_request(5*32+11,"nSTATUS") which is correct in old SDK to try if it is work in the NEW SDK,but is return error -517 also. I have spend many time in this problem and cann't solve it, Please check my programm I attach before.

I cann't close this thread as "this did not resolve my issue" this time, I'll close it later!

Best Regards,