[v3,0/5] hwrng: add support for i.MX6 rngb

Message

Horia Geanta July 14, 2020, 12:39 p.m. UTC

Add support for RNGB found in some i.MX6 SoCs (6SL, 6SLL, 6ULL, 6ULZ),
based on RNGC driver (drivers/char/hw_random/imx-rngc.c).

This driver claims support also for RNGB (besides RNGC),
and is currently used only by i.MX25.

Note:

Several NXP SoC from QorIQ family (P1010, P1023, P4080, P3041, P5020)
also have a RNGB, however it's part of the CAAM
(Cryptograhic Accelerator and Assurance Module) crypto accelerator.
In this case, RNGB is managed in the caam driver
(drivers/crypto/caam/), since it's tightly related to
the caam "job ring" interface, not to mention CAAM internally relying on
RNGB as source of randomness.

On the other hand, the i.MX6 SoCs with RNGB have a DCP
(Data Co-Processor) crypto accelerator and this block and RNGB
are independent.

Changelog:
v3
-mention in the DT binding the compatibility with "fsl,imx25-rngb"
-collected Reviewed-by
v2
-update rngb DT binding with compatible strings for i.MX6 SoCs

Horia Geantă (5):
  dt-bindings: rng: add RNGB compatibles for i.MX6 SoCs
  ARM: dts: imx6sl: fix rng node
  ARM: dts: imx6sll: add rng
  ARM: dts: imx6ull: add rng
  hwrng: imx-rngc: enable driver for i.MX6

 Documentation/devicetree/bindings/rng/imx-rng.txt | 3 +++
 arch/arm/boot/dts/imx6sl.dtsi                     | 2 ++
 arch/arm/boot/dts/imx6sll.dtsi                    | 7 +++++++
 arch/arm/boot/dts/imx6ull.dtsi                    | 7 +++++++
 drivers/char/hw_random/Kconfig                    | 2 +-
 drivers/char/hw_random/imx-rngc.c                 | 3 +++
 6 files changed, 23 insertions(+), 1 deletion(-)