linux-kernel - [PATCH 1/1] tty: serial: qcom_geni_serial: Configure UART_IO_MACRO

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Message-Id: <20200123084132.11802-2-rojay@codeaurora.org>
Date:   Thu, 23 Jan 2020 14:11:32 +0530
From:   Roja Rani Yarubandi <rojay@...eaurora.org>
To:     akashast@...eaurora.org, msavaliy@....qualcomm.com,
        mgautam@...eaurora.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: [PATCH 1/1] tty: serial: qcom_geni_serial: Configure UART_IO_MACRO_CTRL register

Configure UART_IO_MACRO_CTRL register if UART lines are swapped.

Change-Id: I8e82c2395bf4cdc51b3677c3c54f5be3f390a888
Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
---
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 +
 drivers/tty/serial/qcom_geni_serial.c        | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index 7143cb2dbc05..8a8497ca0ec0 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -675,6 +675,7 @@ ap_spi_fp: &spi10 {
 
 &uart3 {
 	status = "okay";
+	qcom,pin_inverse = <0x4643>;
 
 	bluetooth: bluetooth {
 		compatible = "qcom,wcn3991-bt";
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index e1767359cc64..939592ca437c 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -25,6 +25,7 @@
 
 /* UART specific GENI registers */
 #define SE_UART_LOOPBACK_CFG		0x22c
+#define SE_UART_IO_MACRO_CTRL		0x240
 #define SE_UART_TX_TRANS_CFG		0x25c
 #define SE_UART_TX_WORD_LEN		0x268
 #define SE_UART_TX_STOP_BIT_LEN		0x26c
@@ -1240,6 +1241,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
 	int irq;
 	bool console = false;
 	struct uart_driver *drv;
+	u32 val;
 
 	if (of_device_is_compatible(pdev->dev.of_node, "qcom,geni-debug-uart"))
 		console = true;
@@ -1313,6 +1315,10 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = of_property_read_u32(pdev->dev.of_node, "qcom,pin_inverse", &val);
+	if (!ret)
+		writel(val, uport->membase + SE_UART_IO_MACRO_CTRL);
+
 	irq_set_status_flags(uport->irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(uport->dev, uport->irq, qcom_geni_serial_isr,
 			IRQF_TRIGGER_HIGH, port->name, uport);
-- 
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