[PATCH v4 0/5] Add support for StarFive JH7110 TRNG driver

[Chanho Park]

This patchset adds to support StarFive JH7110 TRNG driver. Due to lack
of readl_relaxed API, the first patch tries to import the
APIs(read/write_relaxed) from Linux kernel's implementation. The second
patch adds the missing security clocks which are required by the trng
IP.

This IP can support 128-bit and 256-bit random number generation but
this patch makes 256-bit default mode for convenience.

Change from v3:
- Patch #3: Make one call to generate random number according to 128 or
256 bits of entropy which is suggested by Heinrich.

Changes from v2:
- Patch #3: Add error handling codes of probe() which are suggested by Jaehoon

Changes from v1:
- Patch #3: Apply Heinrich's reviews and his codes
- Patch #5: Add Heinrich's R-b tag

Chanho Park (5):
  riscv: import read/write_relaxed functions
  clk: starfive: jh7110: Add security clocks
  rng: Add StarFive JH7110 RNG driver
  riscv: dts: jh7110: Add rng device tree node
  configs: visionfive2: Enable JH7110 RNG driver

 arch/riscv/dts/jh7110.dtsi             |  10 +
 arch/riscv/include/asm/io.h            |  45 ++++
 configs/starfive_visionfive2_defconfig |   2 +
 drivers/clk/starfive/clk-jh7110.c      |  10 +
 drivers/rng/Kconfig                    |   6 +
 drivers/rng/Makefile                   |   1 +
 drivers/rng/jh7110_rng.c               | 274 +++++++++++++++++++++++++
 7 files changed, 348 insertions(+)
 create mode 100644 drivers/rng/jh7110_rng.c

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2.39.2