[PATCH v3 0/2] hwrng: npcm: add NPCM RNG driver support

From: Tomer Maimon
Date: Thu Sep 12 2019 - 05:03:23 EST

This patch set adds Random Number Generator (RNG) support
for the Nuvoton NPCM Baseboard Management Controller (BMC).

The RNG driver we use power consumption when the RNG
is not required.

The NPCM RNG driver tested on NPCM750 evaluation board.

Addressed comments from:.
- Daniel Thompson: https://lkml.org/lkml/2019/9/10/352
- Milton Miller II : https://lkml.org/lkml/2019/9/10/847
- Daniel Thompson: https://lkml.org/lkml/2019/9/10/294

Changes since version 2:
- Rearrange wait parameter in npcm_rng_read function.
- Calling pm_runtime_enable function before hwrng_register function
called to enable the hwrng before add_early_randomness called.
- Remove quality dt-binding parameter in the driver and documentation.
- Disable CONFIG_PM if devm_hwrng_register failed.
- Remove owner setting in the driver struct.

Changes since version 1:
- Define timout in real-world units.
- Using readl_poll_timeout in rng_read function.
- Honor wait parameter in rng_read function.
- Using local variable instead of #ifndef.
- Remove probe print.

Tomer Maimon (2):
dt-binding: hwrng: add NPCM RNG documentation
hwrng: npcm: add NPCM RNG driver

.../bindings/rng/nuvoton,npcm-rng.txt | 12 ++
drivers/char/hw_random/Kconfig | 13 ++
drivers/char/hw_random/Makefile | 1 +
drivers/char/hw_random/npcm-rng.c | 186 ++++++++++++++++++
4 files changed, 212 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.txt
create mode 100644 drivers/char/hw_random/npcm-rng.c