mbox series

[v3,0/2] Add OP-TEE based hwrng driver

Message ID 1545385912-19068-1-git-send-email-sumit.garg@linaro.org
Headers show
Series Add OP-TEE based hwrng driver | expand

Message

Sumit Garg Dec. 21, 2018, 9:51 a.m. UTC 
On ARM SoC's with TrustZone enabled, peripherals like entropy sources
might not be accessible to normal world (linux in this case) and rather
accessible to secure world (OP-TEE in this case) only. So this driver
aims to provides a generic interface to OP-TEE based random number
generator service.

Example case is Developerbox based on Socionext's Synquacer SoC [1]
which provides 7 thermal sensors accessible from secure world only which
could be used as entropy sources (thermal/measurement noise).

[1] https://www.96boards.org/product/developerbox/

Changes in v3:

- Remove PFX
- optee_rng_read: refine to provide output in read.2 like interface
- Added soft dependency on optee module

Changes in v2:

Instead of device tree, fetch rng infomation like data-rate and quality
from op-tee rng service itself.

Sumit Garg (2):
  dt/bindings: add bindings for optional optee rng-uuid property
  hwrng: add OP-TEE based rng driver

 .../bindings/arm/firmware/linaro,optee-tz.txt      |   4 +
 MAINTAINERS                                        |   5 +
 drivers/char/hw_random/Kconfig                     |  15 ++
 drivers/char/hw_random/Makefile                    |   1 +
 drivers/char/hw_random/optee-rng.c                 | 273 +++++++++++++++++++++
 5 files changed, 298 insertions(+)
 create mode 100644 drivers/char/hw_random/optee-rng.c

-- 
2.7.4