[PATCH V2 2/3] arm64: dts: qcom: sc7180: Add sleep pin ctrl for BT uart
From: satya priya <hidden>
Date: 2020-07-24 03:58:57
Also in:
linux-arm-msm, lkml
Subsystem:
arm/qualcomm chromebook support, arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Linus Torvalds
Add sleep pin ctrl for BT uart, and also change the bias configuration to match Bluetooth module. Signed-off-by: satya priya <redacted> --- 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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