linux-kernel - [PATCH v2] ARM: dts: rockchip: Configure BT_HOST

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Message-Id: <20190610235144.34261-1-mka@chromium.org>
Date:   Mon, 10 Jun 2019 16:51:44 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v2] ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on veyron

From: Doug Anderson <dianders@...omium.org>

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@...omium.org>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
Changes in v2:
- attributed authorship to Doug
- use constant instead of literal for pin number
---
 arch/arm/boot/dts/rk3288-veyron.dtsi | 29 ++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288-veyron.dtsi b/arch/arm/boot/dts/rk3288-veyron.dtsi
index 3257ca90f0e8..e2635ad574e7 100644
--- a/arch/arm/boot/dts/rk3288-veyron.dtsi
+++ b/arch/arm/boot/dts/rk3288-veyron.dtsi
@@ -23,6 +23,31 @@
 		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 @@
 			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.
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog