linux-kernel - [PATCH v3 0/6] OpenRISC de0 nano single and multicore boards

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Message-ID: <20260109134409.2153333-1-shorne@gmail.com>
Date: Fri,  9 Jan 2026 13:43:51 +0000
From: Stafford Horne <shorne@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Linux OpenRISC <linux-openrisc@...r.kernel.org>,
	Stafford Horne <shorne@...il.com>
Subject: [PATCH v3 0/6] OpenRISC de0 nano single and multicore boards

Since v2:
 - Fixup gpio-mmio patch to update driver compatible list and just
   add opencores,gpio to mmio-gpio bindings.  Discussed with Geert and
   Linus W [1].
 - Update new device trees to use proper ordering, remove debug options, remove
   unneeded "status" properties.  Suggested by Geert.
Since v1:
 - Use proper schema in gpio-mmio suggsted by Conor Dooley
 - Remove 0 clock-frequency definitions in dtsi file

The patches add support for OpenRISC systems running on the De0 Nano FPGA
development board.  We have two SoCs which are available here:

 - https://github.com/olofk/de0_nano - Single core
 - https://github.com/stffrdhrn/de0_nano-multicore - Multicore

As I work on tutorials [2] to help other get started with OpenRISC I would like to
have these defconfig and devicetree definitions in the upstream kernel to avoid
losing them.

When I was working on resurrecting these old setup's I found a major bug in
OpenRISC SMP which is fixed in this series as well.

[1] https://lore.kernel.org/lkml/20251217080843.70621-1-shorne@gmail.com/
[2] https://openrisc.io/tutorials/

Stafford Horne (6):
  gpio: mmio: Add compatible for opencores GPIO
  dt-bindings: gpio-mmio: Add opencores GPIO
  openrisc: dts: Add de0 nano config and devicetree
  openrisc: Fix IPIs on simple multicore systems
  openrisc: dts: Split simple smp dts to dts and dtsi
  openrisc: dts: Add de0 nano multicore config and devicetree

 .../devicetree/bindings/gpio/gpio-mmio.yaml   |  9 ++
 arch/openrisc/boot/dts/de0-nano-common.dtsi   | 42 +++++++++
 arch/openrisc/boot/dts/de0-nano-multicore.dts | 25 +++++
 arch/openrisc/boot/dts/de0-nano.dts           | 54 +++++++++++
 arch/openrisc/boot/dts/simple-smp.dts         | 25 +++++
 .../dts/{simple_smp.dts => simple-smp.dtsi}   | 11 +--
 arch/openrisc/configs/de0_nano_defconfig      | 79 ++++++++++++++++
 .../configs/de0_nano_multicore_defconfig      | 92 +++++++++++++++++++
 arch/openrisc/configs/simple_smp_defconfig    |  2 +-
 arch/openrisc/include/asm/smp.h               |  3 +-
 arch/openrisc/kernel/smp.c                    | 22 ++++-
 drivers/gpio/gpio-mmio.c                      |  1 +
 drivers/irqchip/irq-ompic.c                   | 15 ++-
 drivers/irqchip/irq-or1k-pic.c                | 27 +++++-
 14 files changed, 393 insertions(+), 14 deletions(-)
 create mode 100644 arch/openrisc/boot/dts/de0-nano-common.dtsi
 create mode 100644 arch/openrisc/boot/dts/de0-nano-multicore.dts
 create mode 100644 arch/openrisc/boot/dts/de0-nano.dts
 create mode 100644 arch/openrisc/boot/dts/simple-smp.dts
 rename arch/openrisc/boot/dts/{simple_smp.dts => simple-smp.dtsi} (90%)
 create mode 100644 arch/openrisc/configs/de0_nano_defconfig
 create mode 100644 arch/openrisc/configs/de0_nano_multicore_defconfig

-- 
2.51.0