arm64: dts: ti: Add support for Siemens IOT2050 boards

Add support for two Siemens SIMATIC IOT2050 variants, Basic and
Advanced. They are based on the TI AM6528 GP and AM6548 SOCs HS, thus
differ in their number of cores and availability of security features.
Furthermore the Advanced version comes with more RAM, an eMMC and a few
internal differences.

Based on original version by Le Jin.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://new.siemens.com/global/en/products/automation/pc-based/iot-gateways/simatic-iot2050.html
Link: https://github.com/siemens/meta-iot2050
Link: https://lore.kernel.org/r/4fb05969102d14d230e03ca4312ef9706efa61e6.1615473223.git.jan.kiszka@siemens.com

arch/arm64/boot/dts/ti/Makefile

@@ -7,6 +7,8 @@
 #
 
 dtb-$(CONFIG_ARCH_K3) += k3-am654-base-board.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced.dtb
 
 dtb-$(CONFIG_ARCH_K3) += k3-j721e-common-proc-board.dtb
 

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dts

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Siemens AG, 2018-2021
+ *
+ * Authors:
+ *   Le Jin <le.jin@siemens.com>
+ *   Jan Kiszka <jan.kiszk@siemens.com>
+ *
+ * AM6528-based (dual-core) IOT2050 Basic variant
+ * 1 GB RAM, no eMMC, main_uart0 on connector X30
+ */
+
+/dts-v1/;
+
+#include "k3-am65-iot2050-common.dtsi"
+
+/ {
+	compatible = "siemens,iot2050-basic", "ti,am654";
+	model = "SIMATIC IOT2050 Basic";
+
+	memory@80000000 {
+		device_type = "memory";
+		/* 1G RAM */
+		reg = <0x00000000 0x80000000 0x00000000 0x40000000>;
+	};
+
+	cpus {
+		cpu-map {
+			/delete-node/ cluster1;
+		};
+		/delete-node/ cpu@100;
+		/delete-node/ cpu@101;
+	};
+
+	/delete-node/ l2-cache1;
+};
+
+/* eMMC */
+&sdhci0 {
+	status = "disabled";
+};
+
+&main_pmx0 {
+	main_uart0_pins_default: main-uart0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_IOPAD(0x01e4, PIN_INPUT,  0)  /* (AF11) UART0_RXD */
+			AM65X_IOPAD(0x01e8, PIN_OUTPUT, 0)  /* (AE11) UART0_TXD */
+			AM65X_IOPAD(0x01ec, PIN_INPUT,  0)  /* (AG11) UART0_CTSn */
+			AM65X_IOPAD(0x01f0, PIN_OUTPUT, 0)  /* (AD11) UART0_RTSn */
+			AM65X_IOPAD(0x0188, PIN_INPUT,  1)  /* (D25) UART0_DCDn */
+			AM65X_IOPAD(0x018c, PIN_INPUT,  1)  /* (B26) UART0_DSRn */
+			AM65X_IOPAD(0x0190, PIN_OUTPUT, 1)  /* (A24) UART0_DTRn */
+			AM65X_IOPAD(0x0194, PIN_INPUT,  1)  /* (E24) UART0_RIN */
+		>;
+	};
+};
+
+&main_uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_uart0_pins_default>;
+};

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Siemens AG, 2018-2021
+ *
+ * Authors:
+ *   Le Jin <le.jin@siemens.com>
+ *   Jan Kiszka <jan.kiszk@siemens.com>
+ *
+ * AM6548-based (quad-core) IOT2050 Advanced variant
+ * 2 GB RAM, 16 GB eMMC, USB-serial converter on connector X30
+ */
+
+/dts-v1/;
+
+#include "k3-am65-iot2050-common.dtsi"
+
+/ {
+	compatible = "siemens,iot2050-advanced", "ti,am654";
+	model = "SIMATIC IOT2050 Advanced";
+
+	memory@80000000 {
+		device_type = "memory";
+		/* 2G RAM */
+		reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
+	};
+};
+
+&main_pmx0 {
+	main_mmc0_pins_default: main-mmc0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_IOPAD(0x01a8, PIN_INPUT_PULLDOWN, 0)  /* (B25) MMC0_CLK */
+			AM65X_IOPAD(0x01ac, PIN_INPUT_PULLUP,   0)  /* (B27) MMC0_CMD */
+			AM65X_IOPAD(0x01a4, PIN_INPUT_PULLUP,   0)  /* (A26) MMC0_DAT0 */
+			AM65X_IOPAD(0x01a0, PIN_INPUT_PULLUP,   0)  /* (E25) MMC0_DAT1 */
+			AM65X_IOPAD(0x019c, PIN_INPUT_PULLUP,   0)  /* (C26) MMC0_DAT2 */
+			AM65X_IOPAD(0x0198, PIN_INPUT_PULLUP,   0)  /* (A25) MMC0_DAT3 */
+			AM65X_IOPAD(0x0194, PIN_INPUT_PULLUP,   0)  /* (E24) MMC0_DAT4 */
+			AM65X_IOPAD(0x0190, PIN_INPUT_PULLUP,   0)  /* (A24) MMC0_DAT5 */
+			AM65X_IOPAD(0x018c, PIN_INPUT_PULLUP,   0)  /* (B26) MMC0_DAT6 */
+			AM65X_IOPAD(0x0188, PIN_INPUT_PULLUP,   0)  /* (D25) MMC0_DAT7 */
+			AM65X_IOPAD(0x01b8, PIN_OUTPUT_PULLUP,  7)  /* (B23) MMC0_SDWP */
+			AM65X_IOPAD(0x01b4, PIN_INPUT_PULLUP,   0)  /* (A23) MMC0_SDCD */
+			AM65X_IOPAD(0x01b0, PIN_INPUT,          0)  /* (C25) MMC0_DS */
+		>;
+	};
+};
+
+/* eMMC */
+&sdhci0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mmc0_pins_default>;
+	bus-width = <8>;
+	non-removable;
+	ti,driver-strength-ohm = <50>;
+	disable-wp;
+};
+
+&main_uart0 {
+	status = "disabled";
+};