arch/xtensa/esp32/esp32s2 spi errors

[eren-terzioglu]

Summary

SPI3 initialization issues and SPI DMA build errors fixed

• Docs/platforms/espressif: Add SPI docs for esp32s2

Add SPI defconfig docs for esp32s2-saola-1

• boards/xtensa/esp32s2: Add SPI defconfig

Add spi defconfig and SPI3 initializer for esp32s2

• arch/xtensa: Fix esp32s2 SPI errors

Fix esp32s2 SPI DMA and SPI3 errors

Impact

Impact on user: Yes, esp32s2 SPI issues fixed

Impact on build: No

Impact on hardware: Yes, bugfix applied for esp32s2 spi

Impact on documentation: Yes, doc for defconfig added

Impact on security: No

Impact on compatibility: No

Testing

esp32s2-saola-1:spi config used to build

Building

make -j distclean && ./tools/configure.sh esp32s2-saola-1:spi && make -j && make download ESPTOOL_PORT=/dev/ttyUSB0 ESPTOOL_BAUD=921600 ESPTOOL_BINDIR=./

Running

GPIO11 and GPIO13 pins connected with a cable to test and run spi exch AB command

Results

nsh> spi exch AB
Sending:	AB
Received:	AB