How to change the GPIO values which are defined in dts files?

dilshad_alam · ‎06-23-2015

#define MX6QDL_PAD_SD4_DAT5__GPIO2_IO13 0x354 0x73c 0x000 0x5 0x0

This pin mux is configured in arch/arm/boots/dts/imx6dl-pinfunc.h

Would like to use this GPIO pin as output and status as high to enable my Wifi Chip.

I have made these changes in my dt node.

&usdhc2 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_usdhc2_2>;

bus-width = <4>;

cd-gpios = <&gpio2 13 0>;

wp-gpios = <&gpio2 13 0>;

/* no-1-8-v; */

vmmc-supply = <&reg_3p3v>;

keep-power-in-suspend;

enable-sdio-wakeup;

status = "okay";

};

I need to pull this pin low for 10 ms. How do I change this in code?

igorpadykov · ‎06-23-2015

Hi Dilshad

please look at

Best regards

igor

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dilshad_alam · ‎06-23-2015

Hi Igor,

I have tried accessing GPIO's defined in my source code using gpio_request. It;s failing with error 16( Device resouce Busy error EBUSY)

boarddata->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);

err = devm_gpio_request(&host->mmc->class_dev, boarddata->cd_gpio,"wlanen");

if (err) {

dev_err(mmc_dev(host->mmc),

"failed to request wlan en gpio!\n");

}

Could you please let me know why its failing?