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# TI CC13xx / CC26xx entropy driver configuration
# Copyright (c) 2019 Brett Witherspoon
# SPDX-License-Identifier: Apache-2.0
config ENTROPY_CC13XX_CC26XX_RNG
bool "TI SimpleLink CC13xx / CC26xx True Random Number Generator (TRNG)"
depends on SOC_SERIES_CC13X2_CC26X2
select ENTROPY_HAS_DRIVER
select RING_BUFFER
help
This option enables the driver for the True Random Number Generator (TRNG)
for TI SimpleLink CC13xx / CC26xx SoCs.
if ENTROPY_CC13XX_CC26XX_RNG
config ENTROPY_CC13XX_CC26XX_POOL_SIZE
int "Number of bytes in the entropy pool"
default 512
help
The size in bytes of the buffer used to store entropy generated by the
hardware. Should be a power of two for high performance.
config ENTROPY_CC13XX_CC26XX_SAMPLES_PER_CYCLE
int "Number of samples to generate entropy"
range 256 16777216
default 240000
help
The number of samples used to generate entropy. The time required to
generate 64 bits of entropy is determined by the number of FROs enabled,
the sampling (system) clock frequency, and this value.
config ENTROPY_CC13XX_CC26XX_ALARM_THRESHOLD
int "Threshold for detected repeated patterns"
range 0 255
default 255
help
The number of samples detected with repeating patterns before an alarm
event is triggered. The associated FRO is automatically shut down.
config ENTROPY_CC13XX_CC26XX_SHUTDOWN_THRESHOLD
int "Threshold for the number of FROs automatically shut down"
range 0 24
default 0
help
The number of FROs allowed to be shutdown before the driver attempts to
take corrective action.
endif # ENTROPY_CC13XX_CC26XX_RNG