linux-kernel - Re: [PATCH 2/2] ARM: dts: rockchip: Configure BT_HOST

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Date:   Wed, 05 Jun 2019 23:11:12 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        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>
Subject: Re: [PATCH 2/2] ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on veyron

Am Mittwoch, 5. Juni 2019, 22:43:20 CEST schrieb Matthias Kaehlcke:
> 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>

Housekeeping question, with the two Signed-off-by lines, is Doug the
original author, or was this Co-developer-by?

Heiko

> ---
>  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 cc4c3595f145..145cac7c0847 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";
> @@ -555,6 +580,10 @@
>  			rockchip,pins = <4 RK_PD5 RK_FUNC_GPIO &pcfg_pull_none>;
>  		};
>  
> +		bt_host_wake: bt-host-wake {
> +			rockchip,pins = <4 31 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.
>