linux-kernel - Re: [PATCH V6 2/4] arm64: dts: qcom: sc7180: Add wakeup support for BT UART on sc7180-idp

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Date:   Mon, 14 Sep 2020 14:20:46 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     satya priya <skakit@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Akash Asthana <akashast@...eaurora.org>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        msavaliy@....qualcomm.com
Subject: Re: [PATCH V6 2/4] arm64: dts: qcom: sc7180: Add wakeup support for
 BT UART on sc7180-idp

Hi,

On Mon, Sep 14, 2020 at 6:59 AM satya priya <skakit@...eaurora.org> wrote:
>
> Add the necessary pinctrl, interrupt property and a suitable sleep config
> to support Bluetooth wakeup feature.
>
> GPIO mode is configured in sleep state to drive the RTS/RFR line low.
> If QUP function is selected in sleep state, UART RTS/RFR is pulled high
> during suspend and BT SoC not able to send wakeup bytes.
>
> Signed-off-by: satya priya <skakit@...eaurora.org>
> ---
> Changes in V2:
>  - This patch adds sleep state for BT UART. Newly added in V2.
>
> Changes in V3:
>  - Remove "output-high" for TX from both sleep and default states
>    as it is not required. Configure pull-up for TX in sleep state.
>
> Changes in V4:
>  - As per Matthias's comment, removed drive-strength for sleep state
>    and fixed nit-pick.
>
> Changes in V5:
>  - As per Matthias's comments, moved pinmux change for sleep state,
>    pinctrl and interrupt config to the board specific file.
>
> Changes in V6:
>  - As per Doug's comments changed subject, deleted interrupts property.
>  - As per Bjorn's comments changed commit text and rationale for RTS,
>    TX and RX.
>
>  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 55 +++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)

Reviewed-by: Douglas Anderson <dianders@...omium.org>