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    Subject[PATCH AUTOSEL 5.18 26/49] arm64: dts: qcom: sc7280-qcard: Configure CTS pin to bias-bus-hold for bluetooth
    Date
    From: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>

    [ Upstream commit 3d0e375bae55c2dfa6dd0762f45ad71f0b192f71 ]

    WLAN rail was leaking power during RBSC/sleep even after turning BT off.
    Change active and sleep pinctrl configurations to handle same.

    Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
    Reviewed-by: Douglas Anderson <dianders@chromium.org>
    Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
    Link: https://lore.kernel.org/r/1650556567-4995-3-git-send-email-quic_vnivarth@quicinc.com
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi | 19 ++++++++++++++-----
    1 file changed, 14 insertions(+), 5 deletions(-)

    diff --git a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
    index b833ba1e8f4a..98b5cd70bca5 100644
    --- a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
    +++ b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
    @@ -398,8 +398,14 @@ &qup_i2c13_data_clk {

    /* For mos_bt_uart */
    &qup_uart7_cts {
    - /* Configure a pull-down on CTS to match the pull of the Bluetooth module. */
    - bias-pull-down;
    + /*
    + * Configure a bias-bus-hold on CTS to lower power
    + * usage when Bluetooth is turned off. Bus hold will
    + * maintain a low power state regardless of whether
    + * the Bluetooth module drives the pin in either
    + * direction or leaves the pin fully unpowered.
    + */
    + bias-bus-hold;
    };

    /* For mos_bt_uart */
    @@ -490,10 +496,13 @@ qup_uart7_sleep_cts: qup-uart7-sleep-cts {
    pins = "gpio28";
    function = "gpio";
    /*
    - * Configure a pull-down on CTS to match the pull of
    - * the Bluetooth module.
    + * Configure a bias-bus-hold on CTS to lower power
    + * usage when Bluetooth is turned off. Bus hold will
    + * maintain a low power state regardless of whether
    + * the Bluetooth module drives the pin in either
    + * direction or leaves the pin fully unpowered.
    */
    - bias-pull-down;
    + bias-bus-hold;
    };

    /* For mos_bt_uart */
    --
    2.35.1
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