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[v2,0/3] hwrng: add hwrng support for Rockchip RK3568

Message ID 20221128184718.1963353-1-aurelien@aurel32.net (mailing list archive)
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Series hwrng: add hwrng support for Rockchip RK3568 | expand

Message

Aurelien Jarno Nov. 28, 2022, 6:47 p.m. UTC 
Rockchip SoCs used to have a random number generator as part of their
crypto device, and support for it has to be added to the corresponding
driver.

However newer Rockchip SoCs like the RK3568 have an independent True
Random Number Generator device. This patchset adds a driver for it and
enable it in the device tree.

v1 -> v2:
 * Patch 1: fix issues reported by Rob Herring and Krzysztof Kozlowski:
   - Rename rockchip-rng.yaml into rockchip,rk3568-rng.yaml
   - Fix binding title and description
   - Fix compatible property
   - Rename clocks and add the corresponding descriptions
   - Drop reset-names
   - Add a bus definition with #address-cells and #size-cells to the
     example.

 * Patch 2: fix issue reported by kernel test robot <lkp@intel.com>
   - Do not read the random registers as big endian, looking at the
     RK3568 TRM this is actually not needed. This fixes a sparse
     warning.

 * Patch 3: unchanged

Aurelien Jarno (3):
  dt-bindings: RNG: Add Rockchip RNG bindings
  hwrng: add Rockchip SoC hwrng driver
  arm64: dts: rockchip: add DT entry for RNG to RK356x

 .../bindings/rng/rockchip,rk3568-rng.yaml     |  60 +++++
 arch/arm64/boot/dts/rockchip/rk356x.dtsi      |   9 +
 drivers/char/hw_random/Kconfig                |  14 +
 drivers/char/hw_random/Makefile               |   1 +
 drivers/char/hw_random/rockchip-rng.c         | 250 ++++++++++++++++++
 5 files changed, 334 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/rockchip,rk3568-rng.yaml
 create mode 100644 drivers/char/hw_random/rockchip-rng.c