of_get_named_gpio implicit function declaration error

victorwang · 10-14-2018, 10:17 PM

I tried to designed my own driver in freescale BSP Android 4.4.3 source code.
Below is my designed for properties get.

Code:

static const struct of_device_id dido_dt_ids[] = {
	{ .compatible = "winmate,dido", },
};
unsigned int di0_num;

static int dido_get_of_properties(void)
{
	struct device_node *np = of_find_compatible_node(NULL, NULL, dido_dt_ids[0].compatible);
	int i;

    if (!np){
		printk(KERN_WARNING "%s %s() line %d, cannot get device_node \n", __FILE__, __func__, __LINE__);
        return -ENODATA;
    }

	di0_num = of_get_named_gpio(np, "winmate,di0", 0);
	//di_gpio[0] = di0_num;
	if(di0_num<0)
	{
		printk(KERN_WARNING "%s %s() line %d, can not get di0_value gpios!\n", __FILE__, __func__, __LINE__);
		return -ENODATA;
	}
        return 0;
}

When I compile my code it showed below error to me.
drivers/misc/dido.c:96:2: error: implicit declaration of function 'of_get_named_gpio' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors

I could not understand why the declaration is implicit.

Additional note:
Below is my dtsi settings

Code:

dido: winmate-dido {
                compatible = "winmate,dido";
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_dido>;
                status = "okay";
                winmate,di0 = <&gpio1 11 0>;/*MX6QDL_PAD_SD2_CMD__GPIO1_IO11*/
                winmate,di1 = <&gpio1 10 0>;/*MX6QDL_PAD_SD2_CMD__GPIO1_IO10*/
                di-amount = <5>;
                do-amount = <5>;
                di-gpi = <15 14 193>;
                do-gpo = <102 103 104 105 178>;
        };

Can anyone help me on this?

pan64 · 10-19-2018, 04:07 AM

probably this helps: https://stackoverflow.com/questions/...on-of-function

average_user · 10-19-2018, 06:26 AM

Invest some time in learning one of code tagging systems such as ctags or GNU global and you'll learn that of_get_named_gpio() is defined in linux/of_gpio.h.