ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on veyron

This enables wake up on Bluetooth activity when the device is
suspended. The BT_HOST_WAKE signal is only connected on devices
with BT module that are connected through UART.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-veyron.dtsi

@@ -23,6 +23,31 @@ memory {
 		reg = <0x0 0x0 0x0 0x80000000>;
 	};
 
+	bt_activity: bt-activity {
+		compatible = "gpio-keys";
+		pinctrl-names = "default";
+		pinctrl-0 = <&bt_host_wake>;
+
+		/*
+		 * HACK: until we have an LPM driver, we'll use an
+		 * ugly GPIO key to allow Bluetooth to wake from S3.
+		 * This is expected to only be used by BT modules that
+		 * use UART for comms.  For BT modules that talk over
+		 * SDIO we should use a wakeup mechanism related to SDIO.
+		 *
+		 * Use KEY_RESERVED here since that will work as a wakeup but
+		 * doesn't get reported to higher levels (so doesn't confuse
+		 * Chrome).
+		 */
+		bt-wake {
+			label = "BT Wakeup";
+			gpios = <&gpio4 RK_PD7 GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_RESERVED>;
+			wakeup-source;
+		};
+
+	};
+
 	power_button: power-button {
 		compatible = "gpio-keys";
 		pinctrl-names = "default";
@@ -549,6 +574,10 @@ bt_enable_l: bt-enable-l {
 			rockchip,pins = <4 RK_PD5 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 
+		bt_host_wake: bt-host-wake {
+			rockchip,pins = <4 RK_PD7 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+
 		/*
 		 * We run sdio0 at max speed; bump up drive strength.
 		 * We also have external pulls, so disable the internal ones.