linux-kernel - [PATCH v2 0/3] Add UltraRISC DP1000 PLIC support

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Message-ID: <20251013111539.2206477-1-lzampier@redhat.com>
Date: Mon, 13 Oct 2025 12:15:35 +0100
From: Lucas Zampieri <lzampier@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Lucas Zampieri <lzampier@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Vivian Wang <dramforever@...e.com>,
	devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH v2 0/3] Add UltraRISC DP1000 PLIC support

This series adds support for the PLIC implementation in the UltraRISC
DP1000 SoC. The DP1000 PLIC claim register has a hardware bug where
reading it while multiple interrupts are pending can return the wrong
interrupt ID. The workaround temporarily disables all interrupts except
the first pending one before reading the claim register, then restores
the previous state.

The driver matches on "ultrarisc,cp100-plic" (CPU core compatible), allowing
the quirk to apply to all SoCs using UR-CP100 cores (currently DP1000,
potentially future SoCs).

Charles Mirabile (2):
  dt-bindings: interrupt-controller: add UltraRISC DP1000 PLIC
  irqchip/plic: add support for UltraRISC DP1000 PLIC

Lucas Zampieri (1):
  dt-bindings: vendor-prefixes: add UltraRISC

Changes in v2:
- 0002: Changed compatible string pattern to SoC+core: ultrarisc,dp1000-plic
  with ultrarisc,cp100-plic fallback (suggested by Krzysztof and Vivian)
- 0003: Driver now matches on ultrarisc,cp100-plic (core) instead of dp1000 (SoC)
- All patches: Added submitter Signed-off-by to complete DCO chain

 .../devicetree/bindings/vendor-prefixes.yaml      |  2 +
 .../interrupt-controller/sifive,plic-1.0.0.yaml    |  3 +
 drivers/irqchip/irq-sifive-plic.c                  | 83 ++++++++++++++++++-
 3 files changed, 87 insertions(+), 1 deletion(-)

--
2.51.0