linux-kernel - [PATCH V8 6/8] arm64: dts: sc7280: Configure uart7 to support bluetooth on sc7280-idp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1631872087-24416-7-git-send-email-rajpat@codeaurora.org>
Date:   Fri, 17 Sep 2021 15:18:05 +0530
From:   Rajesh Patil <rajpat@...eaurora.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, rnayak@...eaurora.org,
        saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...eaurora.org, sboyd@...nel.org, mka@...omium.org,
        dianders@...omium.org, Rajesh Patil <rajpat@...eaurora.org>
Subject: [PATCH V8 6/8] arm64: dts: sc7280: Configure uart7 to support bluetooth on sc7280-idp

Add bluetooth uart pin configuration for sc7280-idp.

Signed-off-by: Rajesh Patil <rajpat@...eaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
---
Changes in V8:
 - No changes

 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 cf82301..52638e2 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
@@ -301,6 +301,16 @@
 	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 {
@@ -326,6 +336,81 @@
 	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