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From: Rajesh Patil <rajpat@codeaurora.org>
To: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, rnayak@codeaurora.org,
	saiprakash.ranjan@codeaurora.org, msavaliy@qti.qualcomm.com,
	skakit@codeaurora.org, sboyd@kernel.org,
	Rajesh Patil <rajpat@codeaurora.org>
Subject: [PATCH V6 5/7] arm64: dts: sc7280: Configure uart7 to support bluetooth on sc7280-idp
Date: Thu, 26 Aug 2021 18:45:29 +0530	[thread overview]
Message-ID: <1629983731-10595-6-git-send-email-rajpat@codeaurora.org> (raw)
In-Reply-To: <1629983731-10595-1-git-send-email-rajpat@codeaurora.org>

Add bluetooth uart pin configuration for sc7280-idp.

Signed-off-by: Rajesh Patil <rajpat@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.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 53993b3..7c106c0 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
@@ -297,6 +297,16 @@
 	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 */
 
 &qspi_cs0 {
@@ -322,6 +332,81 @@
 	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;
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation


  parent reply	other threads:[~2021-08-26 13:16 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 13:15 [PATCH V6 0/7] Add QSPI and QUPv3 DT nodes for SC7280 SoC Rajesh Patil
2021-08-26 13:15 ` [PATCH V6 1/7] arm64: dts: sc7280: Add QSPI node Rajesh Patil
2021-08-26 18:02   ` Stephen Boyd
2021-08-31 15:29     ` rajpat
2021-08-26 13:15 ` [PATCH V6 2/7] arm64: dts: sc7280: Configure SPI-NOR FLASH for sc7280-idp Rajesh Patil
2021-08-26 18:03   ` Stephen Boyd
2021-08-26 13:15 ` [PATCH V6 3/7] arm64: dts: sc7280: Add QUPv3 wrapper_0 nodes Rajesh Patil
2021-08-26 18:06   ` Stephen Boyd
2021-08-31 15:28     ` rajpat
2021-08-26 20:08   ` Matthias Kaehlcke
2021-08-26 13:15 ` [PATCH V6 4/7] arm64: dts: sc7280: Update QUPv3 UART5 DT node Rajesh Patil
2021-08-26 21:01   ` Matthias Kaehlcke
2021-08-31 15:27     ` rajpat
2021-08-26 13:15 ` Rajesh Patil [this message]
2021-08-26 13:15 ` [PATCH V6 6/7] arm64: dts: sc7280: Add QUPv3 wrapper_1 nodes Rajesh Patil
2021-08-26 18:11   ` Stephen Boyd
2021-08-31 15:28     ` rajpat
2021-09-01  5:04       ` Stephen Boyd
2021-08-26 13:15 ` [PATCH V6 7/7] arm64: dts: sc7280: Add aliases for I2C and SPI Rajesh Patil
2021-08-26 18:12   ` Stephen Boyd
2021-08-31 15:29     ` rajpat

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