Re: [PATCH 2/2] ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on veyron

Doug Anderson
2019-06-06T23:32:59Z

Hi,

On Wed, Jun 5, 2019 at 1:43 PM Matthias Kaehlcke <mka@chromium.org> wrote:
>
> 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>
> ---
> 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>;

nit: s/31/RK_PD7

Other than that, feel free to add my Reviewed-by assuming that this
isn't too hacky for mainline to accept while we wait for someone to
come up with a better solution.

-Doug