From e3bc6fec5aaa67b8147a422d8d88a36d46827f0f Mon Sep 17 00:00:00 2001 From: Rajesh Patil Date: Thu, 23 Sep 2021 17:46:16 +0530 Subject: [PATCH] arm64: dts: qcom: sc7280: Configure uart7 to support bluetooth on sc7280-idp Add bluetooth uart pin configuration for sc7280-idp. Signed-off-by: Rajesh Patil Reviewed-by: Matthias Kaehlcke Reviewed-by: Stephen Boyd Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/1632399378-12229-7-git-send-email-rajpat@codeaurora.org --- arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 85 ++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi index c93e218190211..c41747344c6dc 100644 --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi @@ -322,6 +322,16 @@ vdda18-supply = <&vreg_l1c_1p8>; }; +&uart7 { + status = "okay"; + + /delete-property/interrupts; + interrupts-extended = <&intc GIC_SPI 608 IRQ_TYPE_LEVEL_HIGH>, + <&tlmm 31 IRQ_TYPE_EDGE_FALLING>; + pinctrl-names = "default", "sleep"; + pinctrl-1 = <&qup_uart7_sleep_cts>, <&qup_uart7_sleep_rts>, <&qup_uart7_sleep_tx>, <&qup_uart7_sleep_rx>; +}; + /* PINCTRL - additions to nodes defined in sc7280.dtsi */ &pm7325_gpios { @@ -358,6 +368,81 @@ bias-pull-up; }; +&qup_uart7_cts { + /* + * Configure a pull-down on CTS to match the pull of + * the Bluetooth module. + */ + bias-pull-down; +}; + +&qup_uart7_rts { + /* We'll drive RTS, so no pull */ + drive-strength = <2>; + bias-disable; +}; + +&qup_uart7_tx { + /* We'll drive TX, so no pull */ + drive-strength = <2>; + bias-disable; +}; + +&qup_uart7_rx { + /* + * Configure a pull-up on 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; +}; + +&tlmm { + 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. + */ + bias-pull-down; + }; + + qup_uart7_sleep_rts: qup-uart7-sleep-rts { + pins = "gpio29"; + function = "gpio"; + /* + * 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). + */ + bias-pull-down; + }; + + qup_uart7_sleep_tx: qup-uart7-sleep-tx { + pins = "gpio30"; + function = "gpio"; + /* + * Configure pull-up on TX when it isn't actively driven + * to prevent BT SoC from receiving garbage during sleep. + */ + bias-pull-up; + }; + + qup_uart7_sleep_rx: qup-uart7-sleep-rx { + pins = "gpio31"; + function = "gpio"; + /* + * 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. + */ + bias-pull-up; + }; +}; + &sdc1_on { clk { bias-disable; -- 2.30.2