linux-kernel - [PATCH 0/3] Raspberry Pi 4 HWRNG Support

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Date:   Sun, 17 Nov 2019 23:58:04 -0800
From:   Stephen Brennan <stephen@...nnan.io>
To:     stephen@...nnan.io
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <wahrenst@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: [PATCH 0/3] Raspberry Pi 4 HWRNG Support

This patch series enables support for the HWRNG included on the Raspberry
Pi 4.  It is simply a rebase of Stefan's branch [1]. I went ahead and
tested this out on a Pi 4.  Prior to this patch series, attempting to use
the hwrng gives:

    $ head -c 2 /dev/hwrng
    head: /dev/hwrng: Input/output error

After this patch, the same command gives two random bytes.

[1]: https://github.com/lategoodbye/rpi-zero/tree/bcm2711-hwrng

---

Stefan Wahren (3):
  dt-bindings: rng: add BCM2711 RNG compatible
  hwrng: iproc-rng200: Add support for BCM2711
  ARM: dts: bcm2711: Enable HWRNG support

 Documentation/devicetree/bindings/rng/brcm,iproc-rng200.txt | 1 +
 arch/arm/boot/dts/bcm2711.dtsi                              | 5 ++---
 drivers/char/hw_random/Kconfig                              | 2 +-
 drivers/char/hw_random/iproc-rng200.c                       | 1 +
 4 files changed, 5 insertions(+), 4 deletions(-)

-- 
2.24.0