[PATCH V3 4/4] ARM: dts: imx6ull-dhcom: Add DHSOM based DRC02 board

[Christoph Niedermaier]

Add DT for DH DRC02 unit, which is a universal controller device.
The system has two ethernet ports, two CANs, RS485 and RS232, USB,
capacitive buttons and an OLED display. For this board a DHCOM
i.MX6ULL SoM configuration without WiFi/BT is used. The interface
is used for the SD card instead.

Signed-off-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>
---
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt at linaro.org>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Shawn Guo <shawnguo at kernel.org>
Cc: Marek Vasut <marex at denx.de>
Cc: Fabio Estevam <festevam at denx.de>
Cc: NXP Linux Team <linux-imx at nxp.com>
Cc: kernel at dh-electronics.com
To: linux-arm-kernel at lists.infradead.org
---
V2: - Reorder comments in front of a block
    - Reorder compatible and reg to the beginning of a node
V3: - Change 2nd ethernet ports to be provided by the SoM
---
 arch/arm/boot/dts/Makefile                |  1 +
 arch/arm/boot/dts/imx6ull-dhcom-drc02.dts | 99 +++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 arch/arm/boot/dts/imx6ull-dhcom-drc02.dts

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 39da10e5a5b2..26f0a2ddaa48 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -741,6 +741,7 @@ dtb-$(CONFIG_SOC_IMX6UL) += \
 	imx6ull-colibri-wifi-eval-v3.dtb \
 	imx6ull-colibri-wifi-iris.dtb \
 	imx6ull-colibri-wifi-iris-v2.dtb \
+	imx6ull-dhcom-drc02.dtb \
 	imx6ull-dhcom-pdk2.dtb \
 	imx6ull-dhcom-picoitx.dtb \
 	imx6ull-jozacp.dtb \
diff --git a/arch/arm/boot/dts/imx6ull-dhcom-drc02.dts b/arch/arm/boot/dts/imx6ull-dhcom-drc02.dts
new file mode 100644
index 000000000000..7b2ace573bdf
--- /dev/null
+++ b/arch/arm/boot/dts/imx6ull-dhcom-drc02.dts
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * Copyright (C) 2022 DH electronics GmbH
+ *
+ * DHCOM iMX6ULL variant:
+ * DHCM-iMX6ULL-C080-R051-F0409-SPI-E2-CAN2-SD-RTC-ADC-I-01D2
+ * DHCOR PCB number: 578-200 or newer
+ * DHCOM PCB number: 579-200 or newer
+ * DRC02 PCB number: 568-100 or newer (2nd ethernet by SoM)
+ */
+/dts-v1/;
+
+#include "imx6ull-dhcom-som.dtsi"
+#include "imx6ull-dhcom-som-cfg-sdcard.dtsi"
+
+/ {
+	model = "DH electronics i.MX6ULL DHCOM on DRC02";
+	compatible = "dh,imx6ull-dhcom-drc02", "dh,imx6ull-dhcom-som",
+		     "dh,imx6ull-dhcor-som", "fsl,imx6ull";
+};
+
+/*
+ * The signals for CAN2 TX and RX are routed to the DHCOM UART1 RTS/CTS pins.
+ * Therefore the UART RTS/CTS must be output on other DHCOM pins, see uart1
+ * node below.
+ */
+&can2 {
+	status = "okay";
+};
+
+&gpio1 {
+	gpio-line-names =
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "DRC02-In2",
+		"", "", "", "",
+		"", "", "DHCOM-I", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "";
+};
+
+&gpio4 {
+	gpio-line-names =
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "DRC02-HW0", "DRC02-HW1", "DHCOM-M",
+		"DRC02-HW2", "DHCOM-U", "DHCOM-T", "DHCOM-S",
+		"DHCOM-R", "DHCOM-Q", "DHCOM-P", "DHCOM-O",
+		"DHCOM-N", "", "", "";
+	/*
+	 * NOTE: On DRC02, the RS485_RX_En is controlled by a separate
+	 * GPIO line, however the i.MX6ULL UART driver assumes RX happens
+	 * during TX anyway and that it only controls drive enable DE
+	 * line. Hence, the RX is always enabled here.
+	 */
+	rs485-rx-en-hog {
+		gpio-hog;
+		gpios = <25 0>; /* GPIO Q */
+		line-name = "rs485-rx-en";
+		output-low;
+	};
+};
+
+&gpio5 {
+	gpio-line-names =
+		"DHCOM-A", "DHCOM-B", "DHCOM-C", "DRC02-Out2",
+		"DHCOM-E", "", "", "DRC02-Out1",
+		"DRC02-In1", "DHCOM-H", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "";
+};
+
+/* DHCOM I2C2 */
+&i2c1 {
+	eeprom at 56 {
+		compatible = "atmel,24c04";
+		reg = <0x56>;
+		pagesize = <16>;
+	};
+};
+
+&uart1 {
+	/delete-property/ uart-has-rtscts;
+	rts-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>; /* GPIO I */
+	cts-gpios = <&gpio4 19 GPIO_ACTIVE_HIGH>; /* GPIO M */
+};
+
+/* Use UART as RS485 */
+&uart2 {
+	/delete-property/ uart-has-rtscts;
+	linux,rs485-enabled-at-boot-time;
+	rts-gpios = <&gpio4 26 GPIO_ACTIVE_HIGH>; /* GPIO P */
+};
-- 
2.11.0