linux-kernel - Re: [PATCH V5 2/4] arm64: dts: qcom: sc7180: Add necessary pinctrl and interrupt config for BT UART

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Date:   Thu, 10 Sep 2020 07:40:24 -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 V5 2/4] arm64: dts: qcom: sc7180: Add necessary pinctrl
 and interrupt config for BT UART

Hi,

On Thu, Sep 10, 2020 at 5:55 AM satya priya <skakit@...eaurora.org> wrote:
>
> Add a suitable sleep configuration for uart3 to support Bluetooth wakeup.
>
> 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. So, configure
> GPIO mode in sleep state to keep it low during suspend.
>
> Signed-off-by: satya priya <skakit@...eaurora.org>
> Reviewed-by: Akash Asthana <akashast@...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.
>
>  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 48 +++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)

Similar comment to patch #1 in that this applies only to the IDP board
but that's not obvious from ${SUBJECT}


> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> index 04888df..e529a41 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> @@ -344,6 +344,10 @@
>  };
>
>  &uart3 {
> +       pinctrl-names = "default", "sleep";
> +       pinctrl-1 = <&qup_uart3_sleep>;
> +       interrupts-extended = <&intc GIC_SPI 604 IRQ_TYPE_LEVEL_HIGH>,
> +                               <&tlmm 41 IRQ_TYPE_EDGE_FALLING>;

You need a:

/delete-property/interrupts;

...or, alternatively, a patch before this one that converts all the
UARTs in sc7180 to just use interrupts-extended.


>         status = "okay";

Slight nit is that usually I see the status line first.  All the other
instances in this file have it that way.  Can you match?




-Doug