Patch for RS-485 on UART3 for Colibri iMX6 on H-Board with Toradex Embedded Linux BSP 2.8.6

uart3-rs485.patch

diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index 23770786ab77..9009bb85a93e 100644
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -756,7 +756,7 @@
 		};
 		pinctrl_uart1_ctrl: uart1-ctrlgrp { /* Additional DTR, DSR, DCD */
 			fsl,pins = <
-				MX6QDL_PAD_EIM_D23__UART1_DCD_B 0x1b0b0
+				//MX6QDL_PAD_EIM_D23__UART1_DCD_B 0x1b0b0
 				MX6QDL_PAD_EIM_D24__UART1_DTR_B 0x1b0b0
 				MX6QDL_PAD_EIM_D25__UART1_DSR_B 0x1b0b0
 			>;
@@ -764,7 +764,8 @@
 	};

 	uart2 {
-		pinctrl_uart2_dte: uart2grp-dte { /* DTE mode */		fsl,pins = <
+		pinctrl_uart2_dte: uart2grp-dte { /* DTE mode */
+		fsl,pins = <
 				MX6QDL_PAD_SD4_DAT4__UART2_TX_DATA   0x1b0b1
 				MX6QDL_PAD_SD4_DAT7__UART2_RX_DATA   0x1b0b1
 				MX6QDL_PAD_SD4_DAT6__UART2_RTS_B 0x1b0b1
@@ -780,8 +781,14 @@
 				MX6QDL_PAD_SD4_CMD__UART3_RX_DATA 0x1b0b1
 			>;
 		};
+		   pinctrl_uart3_rts: uart3_rts {
+                fsl,pins = <
+                 MX6QDL_PAD_EIM_D23__GPIO3_IO23    0x1b0b1
+                 >;
+            };
 	};

+
 	usdhc {
 		pinctrl_mmc_cd: gpio_mmc_cd {
 			fsl,pins = <
@@ -995,7 +1002,7 @@
 /* UART A */
 &uart1 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_uart1_dte &pinctrl_uart1_ctrl>;
+	pinctrl-0 = <&pinctrl_uart1_dte>;
 	fsl,dte-mode;
 	fsl,uart-has-rtscts;
 	status = "disabled";
@@ -1013,8 +1020,12 @@
 /* UART_C */
 &uart3 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_uart3_dte>;
+	pinctrl-0 = <&pinctrl_uart3_dte &pinctrl_uart3_rts>;
 	fsl,dte-mode;
+	linux,rs485-enabled-at-boot-time;
+	rs485-rts-active-low;
+	rs485-rx-during-tx;
+	rts-gpios = <&gpio3 23 GPIO_ACTIVE_LOW>;
 	status = "disabled";
 };