ARM: stm32: add new STM32F769 MCU

Add new st,stm32f769 compatible machine name for STM32F769 MCU and update
documentation.

Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

Documentation/arm/stm32/stm32f769-overview.txt

@@ -0,0 +1,36 @@
+			STM32F769 Overview
+			==================
+
+  Introduction
+  ------------
+	The STM32F769 is a Cortex-M7 MCU aimed at various applications.
+	It features:
+	- Cortex-M7 core running up to @216MHz
+	- 2MB internal flash, 512KBytes internal RAM (+4KB of backup SRAM)
+	- FMC controller to connect SDRAM, NOR and NAND memories
+	- Dual mode QSPI
+	- SD/MMC/SDIO support*2
+	- Ethernet controller
+	- USB OTFG FS & HS controllers
+	- I2C*4, SPI*6, CAN*3 busses support
+	- Several 16 & 32 bits general purpose timers
+	- Serial Audio interface *2
+	- LCD controller
+	- HDMI-CEC
+	- DSI
+	- SPDIFRX
+	- MDIO salave interface
+
+  Resources
+  ---------
+	Datasheet and reference manual are publicly available on ST website:
+	- http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32-high-performance-mcus/stm32f7-series/stm32f7x9/stm32f769ni.html
+
+  Document Author
+  ---------------
+	Alexandre Torgue <alexandre.torgue@st.com>
+
+
+
+
+

arch/arm/mach-stm32/board-dt.c

@@ -12,6 +12,7 @@ static const char *const stm32_compat[] __initconst = {
 	"st,stm32f429",
 	"st,stm32f469",
 	"st,stm32f746",
+	"st,stm32f769",
 	"st,stm32h743",
 	NULL
 };