boards/raspberrypi-4b: Add a configuration with PWM audio

This configuration has PWM audio output over the audio jack and built-in
examples to play with it.

Signed-off-by: Matteo Golin <matteo.golin@gmail.com>

Author: linguini1

boards/arm64/bcm2711/raspberrypi-4b/configs/audio_tone/defconfig

@@ -0,0 +1,65 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_NDEBUG is not set
+CONFIG_ARCH="arm64"
+CONFIG_ARCH_ARM64=y
+CONFIG_ARCH_BOARD="raspberrypi-4b"
+CONFIG_ARCH_BOARD_RASPBERRYPI_4B=y
+CONFIG_ARCH_CHIP="bcm2711"
+CONFIG_ARCH_CHIP_BCM2711=y
+CONFIG_ARCH_EARLY_PRINT=y
+CONFIG_ARCH_INTERRUPTSTACK=4096
+CONFIG_ARCH_IRQPRIO=y
+CONFIG_AUDIO=y
+CONFIG_AUDIO_TONE=y
+CONFIG_BCM2711_PWM0=y
+CONFIG_BCM2711_PWM1=y
+CONFIG_BCM2711_PWM=y
+CONFIG_BOARD_LOOPSPERMSEC=132954
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEFAULT_TASK_STACKSIZE=8192
+CONFIG_DRIVERS_AUDIO=y
+CONFIG_EXAMPLES_PWM=y
+CONFIG_EXAMPLES_PWM_DEVPATH="/dev/pwm1"
+CONFIG_EXPERIMENTAL=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=8192
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_PTHREAD_STACK_MIN=8192
+CONFIG_PWM_NCHANNELS=2
+CONFIG_RAMLOG=y
+CONFIG_RAM_SIZE=4227858432
+CONFIG_RAM_START=0x00000000
+CONFIG_RAW_BINARY=y
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RPI4B_AUDIOJACK=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_HPWORKPRIORITY=192
+CONFIG_SPINLOCK=y
+CONFIG_STACK_COLORATION=y
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2022
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_SYSTEM=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_USEC_PER_TICK=1000
+CONFIG_USERLED=y