ARM: dts: imx6qdl-sabresd: add always on pcie regulator

Everything in the PCI specification assumes devices to be
enumerable on startup. This is only possible if they have
power available.

A future improvement may allow this regulator to be switched
off for D3hot and D3cold power states, but there is a lot
of work to do the pcie host controller side for this to work.
To keep things simple always enable the regulator for now.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx6qdl-sabresd.dtsi

@@ -54,6 +54,19 @@
 			gpio = <&gpio4 10 0>;
 			enable-active-high;
 		};
+
+		reg_pcie: regulator@3 {
+			compatible = "regulator-fixed";
+			reg = <3>;
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_pcie_reg>;
+			regulator-name = "MPCIE_3V3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio3 19 0>;
+			regulator-always-on;
+			enable-active-high;
+		};
 	};
 
 	gpio-keys {
@@ -400,6 +413,12 @@
 			>;
 		};
 
+		pinctrl_pcie_reg: pciereggrp {
+			fsl,pins = <
+				MX6QDL_PAD_EIM_D19__GPIO3_IO19	0x1b0b0
+			>;
+		};
+
 		pinctrl_pwm1: pwm1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD1_DAT3__PWM1_OUT		0x1b0b1