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

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Message-id: <20171204125351.26805-1-l.stelmach@samsung.com>
Date:   Mon, 04 Dec 2017 13:53:48 +0100
From:   Åukasz Stelmach <l.stelmach@...sung.com>
To:     "Andrew F. Davis" <afd@...com>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Åukasz Stelmach <l.stelmach@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH v3 0/3] True RNG driver for Samsung Exynos 5250+ SoCs

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