linux-kernel - [PATCH v5 0/3] hwrng: starfive: Add driver for TRNG module

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Message-ID: <20230117015445.32500-1-jiajie.ho@starfivetech.com>
Date:   Tue, 17 Jan 2023 09:54:42 +0800
From:   Jia Jie Ho <jiajie.ho@...rfivetech.com>
To:     Olivia Mackall <olivia@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor.dooley@...rochip.com>
CC:     <linux-crypto@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: [PATCH v5 0/3] hwrng: starfive: Add driver for TRNG module

This patch series adds kernel support for StarFive JH7110 hardware
random number generator. First 2 patches add binding docs and device
driver for this module. Patch 3 adds devicetree entry for VisionFive 2
SoC.

Patch 3 needs to be applied on top of:
https://patchwork.kernel.org/project/linux-riscv/patch/20221220011247.35560-7-hal.feng@starfivetech.com/

Patch 3 also depends on additional clock and reset patches for stg
domain that are yet to be submitted to mailing list.

Changes v4->v5:
- Updated status in MAINTAINERS. (Conor)
- Specified targeted device in Kconfig title and descriptions. (Conor)
- Removed unnecessary goto label in patch 2. (Conor)
- Enable runtime PM before registering hwrng in patch 2. (Conor)

Changes v3->v4:
- Moved init_completion before IRQ registration to be prepared for
  spurious interrupts. (Herbert)
- Added locks to guard concurrent write to the same register. (Herbert)

Changes v2->v3:
- Use constant usecs and convert to jiffies. (Herbert)
- Removed sleep in irq handler. (Herbert)
- Limited wait time to 40us if wait == 0 for trng read. (Herbert)

Changes v1->v2:
- Updated of_match_ptr and added pm_sleep_ptr. (Krzysztof)
- Dropped "status" in dts as module is always on. (Krzysztof)

Jia Jie Ho (3):
  dt-bindings: rng: Add StarFive TRNG module
  hwrng: starfive - Add TRNG driver for StarFive SoC
  riscv: dts: starfive: Add TRNG node for VisionFive 2

 .../bindings/rng/starfive,jh7110-trng.yaml    |  55 +++
 MAINTAINERS                                   |   6 +
 arch/riscv/boot/dts/starfive/jh7110.dtsi      |  10 +
 drivers/char/hw_random/Kconfig                |  11 +
 drivers/char/hw_random/Makefile               |   1 +
 drivers/char/hw_random/jh7110-trng.c          | 393 ++++++++++++++++++
 6 files changed, 476 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/starfive,jh7110-trng.yaml
 create mode 100644 drivers/char/hw_random/jh7110-trng.c

-- 
2.25.1