arch/arm64/boot/dts/qcom/apq8096-db820c-pmic-pins.dtsi

#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
&pm8994_gpios {

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

	ls_exp_gpio_f: pm8994_gpio5 {
		pinconf {
			pins = "gpio5";
			output-low;
			power-source = <2>; // PM8994_GPIO_S4, 1.8V
		};
	};

	volume_up_gpio: pm8996_gpio2 {
		pinconf {
			pins = "gpio2";
			function = "normal";
			input-enable;
			drive-push-pull;
			bias-pull-up;
			qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
			power-source = <PM8994_GPIO_S4>; // 1.8V
		};
	};
};