diff options
| author | Jeffrey Hugo <jeffrey.l.hugo@gmail.com> | 2019-10-21 18:19:21 +0200 |
|---|---|---|
| committer | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-12-18 06:26:58 +0100 |
| commit | 8529728f25d620d82c118bd683fcd7bcf2b18ac5 (patch) | |
| tree | bf7f9a489a5e57d5f4c6ea80fb8e752e18861603 /arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi | |
| parent | arm64: dts: qcom: sdm845-cheza: Add cr50 spi node (diff) | |
| download | linux-8529728f25d620d82c118bd683fcd7bcf2b18ac5.tar.xz linux-8529728f25d620d82c118bd683fcd7bcf2b18ac5.zip | |
arm64: dts: qcom: msm8998: Fixup uart3 gpio config for bluetooth
It turns out that the wcn3990 can float the gpio lines during bootup, etc
which will result in the uart core thinking there is incoming data. This
results in the bluetooth stack getting garbage. By applying a bias to
match what wcn3990 would drive, the issue is corrected.
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lore.kernel.org/r/20191021161921.31825-1-jeffrey.l.hugo@gmail.com
[bjorn: Moved board specific pinctrl states to the end]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi')
| -rw-r--r-- | arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi b/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi index 0f84fa0894a4..b3cf263f4a00 100644 --- a/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi @@ -301,3 +301,26 @@ vdd-1.3-rfa-supply = <&vreg_l17a_1p3>; vdd-3.3-ch0-supply = <&vreg_l25a_3p3>; }; + +/* PINCTRL - board-specific pinctrl */ +&blsp1_uart3_on { + rx { + /delete-property/ bias-disable; + /* + * Configure a pull-up on 45 (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). + */ + bias-pull-up; + }; + + cts { + /delete-property/ bias-disable; + /* + * Configure a pull-down on 47 (CTS) to match the pull + * of the Bluetooth module. + */ + bias-pull-down; + }; +}; |