[PATCH v3 0/3] True RNG driver for Samsung Exynos 5250+ SoCs

[Åukasz Stelmach]

Hello.

The following patches add support for the true random number generator
found in Samsung Exynos 5250+ SoCs.

Patch #1 adds documentation for devicetree bindings.

Patch #2 introduces the driver and appropriate changes in Makefile and Kconfig.

Patch #3 adds nodes in devicetree files for Exynos SoCs (requires
https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux.git/commit/?id=cdd745c8c76b02471d88f467c44a3d4eb431aa0b).

Changes in v3:

- Changed node-name in device-tree bindings according to from Krzysztof
  Koz‚³owski's recommendation.
- Fixed name and added EXYNOS_ in EXYNOS_TRNG_CTRL_RNGEN
- Removed unnecessary label and simplifed the abnormal exit path in
  exynos_trng_probe()
- Replaced __raw_{readl,writel}() with {readl,writel}_relaxed() (thanks
  PrasannaKumar Muralidharan)

Changes in v2:
- Fixed indentation in drivers/char/hw_random/Kconfig.
- Defined TRNG_CTRL_RGNEN.
- Removed global variable exynos_trng_dev.
- Removed exynos_trng_{set,get}_reg() functions.
- Used the min_t() macro instead of the ternary operator in
  exynos_trng_do_read().
- Moved trng initialisation to the variable declaration in
  exynos_trng_init().
- Fixed comment formating.
- Removed unnecessary "TODO" comments.
- Return ENOMEM, if devm_kzalloc() devm_kstrdup() fail.
- Rephrased and unified error messages in exynos_trng_probe().
- Removed nullification of trng->mem.
- Added err_pm_get label at the end of exynos_trng_probe().
- Removed double error message at the end of exynos_trng_probe().
- Implemented exynos_trng_remove().

v2 available here:

https://www.spinics.net/lists/linux-samsung-soc/msg61280.html
https://patchwork.kernel.org/patch/10076225/
https://patchwork.kernel.org/patch/10076227/
https://patchwork.kernel.org/patch/10076237/

v1 can be found:

https://www.spinics.net/lists/linux-samsung-soc/msg61253.html
https://patchwork.kernel.org/patch/10072967/
https://patchwork.kernel.org/patch/10072971/
https://patchwork.kernel.org/patch/10072963/

‚£ukasz Stelmach (3):
  dt-bindings: hwrng: Add Samsung Exynos 5250+ True RNG bindings
  hwrng: exynos - add Samsung Exynos True RNG driver
  ARM: dts: exynos: Add nodes for True Random Number Generator

 .../bindings/rng/samsung,exynos5250-trng.txt       |  17 ++
 MAINTAINERS                                        |   7 +
 arch/arm/boot/dts/exynos5.dtsi                     |   5 +
 arch/arm/boot/dts/exynos5250.dtsi                  |   5 +
 arch/arm/boot/dts/exynos5410.dtsi                  |   5 +
 arch/arm/boot/dts/exynos5420.dtsi                  |   5 +
 drivers/char/hw_random/Kconfig                     |  12 +
 drivers/char/hw_random/Makefile                    |   1 +
 drivers/char/hw_random/exynos-trng.c               | 245 +++++++++++++++++++++
 9 files changed, 302 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.txt
 create mode 100644 drivers/char/hw_random/exynos-trng.c

-- 
2.11.0