board: qualcomm: Add support for dragonboard845c

Add support for 96Boards Dragonboard 845C aka Robotics RB3 development
platform. This board complies with 96Boards Open Platform Specifications.

Features:
- Qualcomm Snapdragon SDA845 SoC
- 4GiB RAM
- 64GiB UFS drive

U-boot is chain loaded by ABL in 64-bit mode as part of boot.img.
For detailed build and boot instructions, refer to
doc/board/qualcomm/sdm845.rst, board: dragonboard845c.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

arch/arm/dts/dragonboard845c-uboot.dtsi

@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * U-Boot addition to handle Qualcomm Robotics RB3 Development Platform
+ * (dragonboard845c) pins
+ *
+ * (C) Copyright 2022 Sumit Garg <sumit.garg@linaro.org>
+ */
+
+/
+{
+	soc {
+		u-boot,dm-pre-reloc;
+
+		serial@a84000 {
+			u-boot,dm-pre-reloc;
+		};
+
+		clock-controller@100000 {
+			u-boot,dm-pre-reloc;
+		};
+
+		pinctrl_north@3900000 {
+			u-boot,dm-pre-reloc;
+		};
+	};
+};
+
+&pm8998_pon {
+	key_vol_down {
+		gpios = <&pm8998_pon 1 0>;
+		label = "key_vol_down";
+	};
+	key_power {
+		gpios = <&pm8998_pon 0 0>;
+		label = "key_power";
+	};
+};

arch/arm/dts/dragonboard845c.dts

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Qualcomm Robotics RB3 Development (dragonboard845c) board device
+ * tree source
+ *
+ * (C) Copyright 2022 Sumit Garg <sumit.garg@linaro.org>
+ */
+
+/dts-v1/;
+
+#include "sdm845.dtsi"
+
+/ {
+	model = "Thundercomm Dragonboard 845c";
+	compatible = "thundercomm,db845c", "qcom,sdm845";
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	aliases {
+		serial0 = &debug_uart;
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0 0x80000000 0 0xfdfa0000>;
+	};
+
+	psci {
+		compatible = "arm,psci-1.0";
+		method = "smc";
+	};
+
+	soc: soc {
+		serial@a84000 {
+			status = "okay";
+		};
+	};
+};
+
+#include "dragonboard845c-uboot.dtsi"

arch/arm/mach-snapdragon/Kconfig

@@ -44,6 +44,19 @@ config TARGET_DRAGONBOARD820C
 	  - 3GiB RAM
 	  - 32GiB UFS drive
 
+config TARGET_DRAGONBOARD845C
+	bool "96Boards Dragonboard 845C"
+	help
+	  Support for 96Boards Dragonboard 845C aka Robotics RB3 Development
+	  Platform. This board complies with 96Boards Open Platform
+	  Specifications. Features:
+	  - Qualcomm Snapdragon SDA845 SoC
+	  - 4GiB RAM
+	  - 64GiB UFS drive
+	select MISC_INIT_R
+	select SDM845
+	select DM_ETH if NET
+
 config TARGET_STARQLTECHN
 	bool "Samsung S9 SM-G9600(starqltechn)"
 	help
@@ -60,6 +73,7 @@ endchoice
 
 source "board/qualcomm/dragonboard410c/Kconfig"
 source "board/qualcomm/dragonboard820c/Kconfig"
+source "board/qualcomm/dragonboard845c/Kconfig"
 source "board/samsung/starqltechn/Kconfig"
 
 endif