arm: dts: Add initial support for AM68 Starter Kit System on Module

AM68 Starter Kit (SK) is a low cost, small form factor board designed
for TI’s AM68 SoC. TI’s AM68 SoC comprises of dual core A72, high
performance vision accelerators, hardware accelerators, latest C71x
DSP, high bandwidth real-time IPs for capture and display. The SoC is
power optimized to provide best in class performance for industrial
applications.

        AM68 SK supports the following interfaces:
        * 16 GB LPDDR4 RAM
        * x1 Gigabit Ethernet interface
        * x1 USB 3.1 Type-C port
        * x2 USB 3.1 Type-A ports
        * x1 PCIe M.2 M Key
        * 512 Mbit OSPI flash
        * x2 CSI2 Camera interface (RPi and TI Camera connector)
        * 40-pin Raspberry Pi GPIO header

SK's System on Module (SoM) contains the SoC, PMIC, DDR and OSPI flash.
Therefore, add support for the components present on the SoM.

Schematics: https://www.ti.com/lit/zip/SPRR463
TRM: http://www.ti.com/lit/pdf/spruj28

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/arch/arm/dts/k3-am68-sk-som.dtsi b/arch/arm/dts/k3-am68-sk-som.dtsi
new file mode 100644
index 00000000000..cb1c58fcd15
--- /dev/null
+++ b/arch/arm/dts/k3-am68-sk-som.dtsi
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+
+#include "k3-j721s2.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	memory@80000000 {
+		device_type = "memory";
+		/* 16 GB RAM */
+		reg = <0x00 0x80000000 0x00 0x80000000>,
+		      <0x08 0x80000000 0x03 0x80000000>;
+	};
+
+	/* Reserving memory regions still pending */
+	reserved_memory: reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		secure_ddr: optee@9e800000 {
+			reg = <0x00 0x9e800000 0x00 0x01800000>;
+			alignment = <0x1000>;
+			no-map;
+		};
+	};
+};
+
+&mailbox0_cluster0 {
+	status = "disabled";
+};
+
+&mailbox0_cluster1 {
+	status = "disabled";
+};
+
+&mailbox0_cluster2 {
+	status = "disabled";
+};
+
+&mailbox0_cluster3 {
+	status = "disabled";
+};
+
+&mailbox0_cluster4 {
+	status = "disabled";
+};
+
+&mailbox0_cluster5 {
+	status = "disabled";
+};
+
+&mailbox0_cluster6 {
+	status = "disabled";
+};
+
+&mailbox0_cluster7 {
+	status = "disabled";
+};
+
+&mailbox0_cluster8 {
+	status = "disabled";
+};
+
+&mailbox0_cluster9 {
+	status = "disabled";
+};
+
+&mailbox0_cluster10 {
+	status = "disabled";
+};
+
+&mailbox0_cluster11 {
+	status = "disabled";
+};
+
+&mailbox1_cluster0 {
+	status = "disabled";
+};
+
+&mailbox1_cluster1 {
+	status = "disabled";
+};
+
+&mailbox1_cluster2 {
+	status = "disabled";
+};
+
+&mailbox1_cluster3 {
+	status = "disabled";
+};
+
+&mailbox1_cluster4 {
+	status = "disabled";
+};
+
+&mailbox1_cluster5 {
+	status = "disabled";
+};
+
+&mailbox1_cluster6 {
+	status = "disabled";
+};
+
+&mailbox1_cluster7 {
+	status = "disabled";
+};
+
+&mailbox1_cluster8 {
+	status = "disabled";
+};
+
+&mailbox1_cluster9 {
+	status = "disabled";
+};
+
+&mailbox1_cluster10 {
+	status = "disabled";
+};
+
+&mailbox1_cluster11 {
+	status = "disabled";
+};