stm32_otgfsdev: avoid a fault on a bad epnum USB RX interrupt

this avoids the fault, but we don't understand what causes it.

stm32_otgfsdev: avoid a fault on a bad epnum USB RX interrupt

this avoids the fault, but we don't understand what causes it.

Merge remote-tracking branch 'upstream/master'

fat: use DMA memory for mkfatfs when needed

this makes mkfatfs use fat_dma_alloc() when CONFIG_FAT_DMAMEMORY is
set. This is needed to ensure mkfatfs operates with boards that use
DMA for microSD

Merge remote-tracking branch 'upstream/master'

Merge remote-tracking branch 'upstream/master'

stm32_i2c: handle more error conditions on I2C bus

this fixes a I2C ISR storm condition where status=0x70084, which can
happen with some specific types of noise on the I2C bus. This was
reproduced by playing 80s rock through a Jabra wireless headset close
to the I2C cables.

stm32_i2c: ensure that unexpected ISR can't overwrite stale data

if we get an ISR leftover from a previous read transfer it could use
stale values for priv->dcnt and priv->ptr to overwrite stack that is
no longer in scope. This resets dcnt and ptr on each new
stm32_i2c_process() call to ensure that any unexpected data bytes are
discarded

mtd: added MTDIOC_SETSPEED ioctl

allows setting of SPI bus speed

mtd: added MTDIOC_SETSPEED ioctl

allows setting of SPI bus speed