[PATCH 2/2] arm64: phygate-tauri-l add overlays for RS232 and RS485

From: Parthiban Nallathambi
Date: Sat May 25 2024 - 13:19:30 EST

UART2 and UART4 can used in following combination,

2 x RS232:
- UART2 and UART4 without flow control
- MUX selection GPIO3_20 must be held low

1 x RS232 + 1 x RS485:
- UART2 - RS232
- UART4 - RS485
- MUX selection GPIO3_20 must be held high
- RE/DE for RS485 controlled with GPIO3_25

1 x RS232 with flow control:
- UART2 - RS232
- MUX selection GPIO3_20 must be held low

Signed-off-by: Parthiban Nallathambi <parthiban@xxxxxxxxxxx>
---
arch/arm64/boot/dts/freescale/Makefile | 8 ++
.../imx8mm-phygate-tauri-l-rs232-rs232.dtso | 72 ++++++++++++++++++
.../imx8mm-phygate-tauri-l-rs232-rs485.dtso | 76 +++++++++++++++++++
.../imx8mm-phygate-tauri-l-rs232-rts-cts.dtso | 41 ++++++++++
4 files changed, 197 insertions(+)
create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso
create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs485.dtso
create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rts-cts.dtso

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index bd443c2bc5a4..c150dfaa01c6 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -263,6 +263,14 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs485.dtb
dtb-$(CONFIG_ARCH_MXC) += imx8mp-venice-gw74xx-imx219.dtb
dtb-$(CONFIG_ARCH_MXC) += imx8mp-venice-gw74xx-rpidsi.dtb

+imx8mm-phygate-tauri-l-rs232-rs232-dtbs := imx8mm-phygate-tauri-l.dtb imx8mm-phygate-tauri-l-rs232-rs232.dtbo
+imx8mm-phygate-tauri-l-rs232-cts-rts-dtbs := imx8mm-phygate-tauri-l.dtb imx8mm-phygate-tauri-l-rs232-rts-cts.dtbo
+imx8mm-phygate-tauri-l-rs232-rs485-dtbs := imx8mm-phygate-tauri-l.dtb imx8mm-phygate-tauri-l-rs232-rs485.dtbo
+
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-phygate-tauri-l-rs232-rs232.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-phygate-tauri-l-rs232-cts-rts.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-phygate-tauri-l-rs232-rs485.dtb
+
dtb-$(CONFIG_ARCH_S32) += s32g274a-evb.dtb
dtb-$(CONFIG_ARCH_S32) += s32g274a-rdb2.dtb
dtb-$(CONFIG_ARCH_S32) += s32g399a-rdb3.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso
new file mode 100644
index 000000000000..bf3e04651ba0
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2021 PHYTEC Messtechnik GmbH
+ * Author: Jens Lang <j.lang@xxxxxxxxx>
+ *
+ * Tauri-L 2 x RS232:
+ * - GPIO3_20 uart4_rs485_en needs to be driven low (inactive)
+ */
+
+#include <dt-bindings/clock/imx8mm-clock.h>
+#include <dt-bindings/gpio/gpio.h>
+#include "imx8mm-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+ compatible = "phytec,imx8mm-phygate-tauri-l";
+
+};
+
+&gpio3 {
+ pinctrl-names = "default";
+ pinctrcl-0 = <&pinctrl_gpio3_hog>;
+
+ uart4_rs485_en {
+ gpio-hog;
+ gpios = <20 GPIO_ACTIVE_HIGH>;
+ output-low;
+ line-name = "uart4_rs485_en";
+ };
+};
+
+/* UART2 - RS232 */
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart2>;
+ assigned-clocks = <&clk IMX8MM_CLK_UART2>;
+ assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
+ status = "okay";
+};
+
+/* UART4 - RS232 */
+&uart4 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart4>;
+ assigned-clocks = <&clk IMX8MM_CLK_UART4>;
+ assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_gpio3_hog: gpio3hoggrp {
+ fsl,pins = <
+ MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20 0x49
+ >;
+ };
+
+ pinctrl_uart2: uart2grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x00
+ MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x00
+ >;
+ };
+
+ pinctrl_uart4: uart4grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX 0x49
+ MX8MM_IOMUXC_UART4_TXD_UART4_DCE_TX 0x49
+ >;
+ };
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs485.dtso b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs485.dtso
new file mode 100644
index 000000000000..f4448cde0407
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs485.dtso
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2021 PHYTEC Messtechnik GmbH
+ * Author: Jens Lang <j.lang@xxxxxxxxx>
+ *
+ * Tauri-L RS232 + RS485:
+ * - GPIO3_20 uart4_rs485_en needs to be driven high (active)
+ * - GPIO3_25 RS485_DE Driver enable
+ */
+
+#include <dt-bindings/clock/imx8mm-clock.h>
+#include <dt-bindings/gpio/gpio.h>
+#include "imx8mm-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+ compatible = "phytec,imx8mm-phygate-tauri-l";
+
+};
+
+&gpio3 {
+ pinctrl-names = "default";
+ pinctrcl-0 = <&pinctrl_gpio3_hog>;
+
+ uart4_rs485_en {
+ gpio-hog;
+ gpios = <20 GPIO_ACTIVE_HIGH>;
+ output-high;
+ line-name = "uart4_rs485_en";
+ };
+};
+
+/* UART2 - RS232 */
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart2>;
+ assigned-clocks = <&clk IMX8MM_CLK_UART2>;
+ assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
+ status = "okay";
+};
+
+/* UART4 - RS485 */
+&uart4 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart4>;
+ assigned-clocks = <&clk IMX8MM_CLK_UART4>;
+ assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
+ rts-gpios = <&gpio3 25 GPIO_ACTIVE_HIGH>;
+ linux,rs485-enabled-at-boot-time;
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_gpio3_hog: gpio3hoggrp {
+ fsl,pins = <
+ MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20 0x49
+ >;
+ };
+
+ pinctrl_uart2: uart2grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x00
+ MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x00
+ >;
+ };
+
+ pinctrl_uart4: uart4grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX 0x49
+ MX8MM_IOMUXC_UART4_TXD_UART4_DCE_TX 0x49
+ MX8MM_IOMUXC_SAI5_MCLK_GPIO3_IO25 0x49
+ >;
+ };
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rts-cts.dtso b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rts-cts.dtso
new file mode 100644
index 000000000000..107f743fbb1c
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rts-cts.dtso
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2023 PHYTEC Messtechnik GmbH
+ * Author: Jens Lang <j.lang@xxxxxxxxx>
+ *
+ * Tauri-L RS232 with RTS/CTS hardware flow control:
+ * - UART4_TX becomes RTS
+ * - UART4_RX becomes CTS
+ */
+
+#include <dt-bindings/clock/imx8mm-clock.h>
+#include "imx8mm-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+
+&{/} {
+ compatible = "phytec,imx8mm-phygate-tauri-l";
+
+};
+
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart2>;
+ assigned-clocks = <&clk IMX8MM_CLK_UART2>;
+ assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
+ uart-has-rtscts;
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_uart2: uart2grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x00
+ MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x00
+ MX8MM_IOMUXC_UART4_RXD_UART2_DCE_CTS_B 0x00
+ MX8MM_IOMUXC_UART4_TXD_UART2_DCE_RTS_B 0x00
+ >;
+ };
+};
--
2.34.1