From 9a36c6fd09952e1018cca734871ff43d850dd971 Mon Sep 17 00:00:00 2001 From: satya priya Date: Mon, 14 Sep 2020 19:28:35 +0530 Subject: [PATCH] arm64: dts: qcom: sc7180: Add wakeup support for BT UART on sc7180-idp Add the necessary pinctrl, interrupt property and a suitable sleep config to support Bluetooth wakeup feature. GPIO mode is configured in sleep state to drive the RTS/RFR line low. 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. Reviewed-by: Matthias Kaehlcke Reviewed-by: Douglas Anderson Signed-off-by: satya priya Link: https://lore.kernel.org/r/1600091917-7464-3-git-send-email-skakit@codeaurora.org Signed-off-by: Bjorn Andersson --- arch/arm64/boot/dts/qcom/sc7180-idp.dts | 55 +++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts index cd8e6fa..e77a792 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts @@ -346,6 +346,13 @@ &uart3 { status = "okay"; + /delete-property/interrupts; + interrupts-extended = <&intc GIC_SPI 604 IRQ_TYPE_LEVEL_HIGH>, + <&tlmm 41 IRQ_TYPE_EDGE_FALLING>; + + pinctrl-names = "default", "sleep"; + pinctrl-1 = <&qup_uart3_sleep>; + bluetooth: wcn3990-bt { compatible = "qcom,wcn3990-bt"; vddio-supply = <&vreg_l10a_1p8>; @@ -544,3 +551,51 @@ }; }; +&tlmm { + qup_uart3_sleep: qup-uart3-sleep { + pinmux { + pins = "gpio38", "gpio39", + "gpio40", "gpio41"; + function = "gpio"; + }; + + pinconf-cts { + /* + * Configure a pull-down on CTS to match the pull of + * the Bluetooth module. + */ + pins = "gpio38"; + bias-pull-down; + }; + + pinconf-rts { + /* + * Configure pull-down on RTS. As RTS is active low + * signal, pull it low to indicate the BT SoC that it + * can wakeup the system anytime from suspend state by + * pulling RX low (by sending wakeup bytes). + */ + pins = "gpio39"; + bias-pull-down; + }; + + pinconf-tx { + /* + * Configure pull-up on TX when it isn't actively driven + * to prevent BT SoC from receiving garbage during sleep. + */ + pins = "gpio40"; + bias-pull-up; + }; + + pinconf-rx { + /* + * Configure a pull-up on RX. This is needed to avoid + * garbage data when the TX pin of the Bluetooth module + * is floating which may cause spurious wakeups. + */ + pins = "gpio41"; + bias-pull-up; + }; + }; +}; -- 2.7.4