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-rw-r--r--arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts
new file mode 100644
index 000000000..1f8ea20df
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2022 Gateworks Corporation
+ *
+ * GW73xx RS232 with RTS/CTS hardware flow control:
+ * - GPIO4_0 rs485_en needs to be driven low (in-active)
+ * - UART4_TX becomes RTS
+ * - UART4_RX becomes CTS
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "imx8mm-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+ compatible = "gw,imx8mm-gw73xx-0x";
+};
+
+&gpio4 {
+ rs485_en {
+ gpio-hog;
+ gpios = <0 GPIO_ACTIVE_HIGH>;
+ output-low;
+ line-name = "rs485_en";
+ };
+};
+
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart2>;
+ rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>;
+ cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>;
+ status = "okay";
+};
+
+&uart4 {
+ status = "disabled";
+};
+
+&iomuxc {
+ pinctrl_uart2: uart2grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140
+ MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
+ MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140
+ MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140
+ >;
+ };
+};