linux-kernel - Re: [PATCH V2 2/3] arm64: dts: qcom: sc7180: Add sleep pin ctrl for BT uart

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Date:   Tue, 28 Jul 2020 11:08:40 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     satya priya <skakit@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        gregkh@...uxfoundation.org
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, rojay@...eaurora.org,
        msavaliy@....qualcomm.com
Subject: Re: [PATCH V2 2/3] arm64: dts: qcom: sc7180: Add sleep pin ctrl for
 BT uart


On 7/24/2020 9:28 AM, satya priya wrote:
> Add sleep pin ctrl for BT uart, and also change the bias
> configuration to match Bluetooth module.


Reviewed-by: Akash Asthana <akashast@...eaurora.org>

> Signed-off-by: satya priya <skakit@...eaurora.org>
> ---
> Changes in V2:
>   - This patch adds sleep state for BT UART. Newly added in V2.
>
>   arch/arm64/boot/dts/qcom/sc7180-idp.dts | 42 ++++++++++++++++++++++++++++-----
>   1 file changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> index 26cc491..bc919f2 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> @@ -469,20 +469,50 @@
>   
>   &qup_uart3_default {
>   	pinconf-cts {
> -		/*
> -		 * Configure a pull-down on 38 (CTS) to match the pull of
> -		 * the Bluetooth module.
> -		 */
> +		/* Configure no pull on 38 (CTS) to match Bluetooth module */
>   		pins = "gpio38";
> +		bias-disable;
> +	};
> +
> +	pinconf-rts {
> +		/* We'll drive 39 (RTS), so configure pull-down */
> +		pins = "gpio39";
> +		drive-strength = <2>;
>   		bias-pull-down;
> +	};
> +
> +	pinconf-tx {
> +		/* We'll drive 40 (TX), so no pull */
> +		pins = "gpio40";
> +		drive-strength = <2>;
> +		bias-disable;
>   		output-high;
>   	};
>   
> +	pinconf-rx {
> +		/*
> +		 * Configure a pull-up on 41 (RX). This is needed to avoid
> +		 * garbage data when the TX pin of the Bluetooth module is
> +		 * in tri-state (module powered off or not driving the
> +		 * signal yet).
> +		 */
> +		pins = "gpio41";
> +		bias-pull-up;
> +	};
> +};
> +
> +&qup_uart3_sleep {
> +	pinconf-cts {
> +		/* Configure no-pull on 38 (CTS) to match Bluetooth module */
> +		pins = "gpio38";
> +		bias-disable;
> +	};
> +
>   	pinconf-rts {
> -		/* We'll drive 39 (RTS), so no pull */
> +		/* We'll drive 39 (RTS), so configure pull-down */
>   		pins = "gpio39";
>   		drive-strength = <2>;
> -		bias-disable;
> +		bias-pull-down;
>   	};
>   
>   	pinconf-tx {

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