dts: hikey: add WLAN_EN pin as fixed regulator

Add WLAN_EN GPIO pin into DTS as fixed regulator

Signed-off-by: Guodong Xu <[email protected]>

Author: docularxu

arch/arm64/boot/dts/hi6220-hikey.dts

@@ -182,4 +182,21 @@
 
 	};
 
+	/* power control mechanism for WLAN_EN */
+	wlan_en_reg: fixedregulator@1 {
+		compatible = "regulator-fixed";
+		regulator-name = "wlan-en-regulator";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+
+		/* WLAN_EN GPIO for this board - GPIO_0_5 */
+		gpio = <&gpio0 5 0>;
+
+		/* WLAN card specific delay */
+		startup-delay-us = <70000>;
+		enable-active-high;
+
+		/* temp solution */
+		regulator-always-on;
+	};
 };