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

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

[Lucas Zampieri]

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

[PATCH v2 1/3] dt-bindings: vendor-prefixes: add UltraRISC

[Lucas Zampieri]

Add vendor prefix for UltraRISC Technology Co., Ltd.

Signed-off-by: Lucas Zampieri <lzampier@redhat.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 123456789abc..234567890def 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1642,6 +1642,8 @@ patternProperties:
     description: Universal Scientific Industrial Co., Ltd.
   "^usr,.*":
     description: U.S. Robotics Corporation
+  "^ultrarisc,.*":
+    description: UltraRISC Technology Co., Ltd.
   "^ultratronik,.*":
     description: Ultratronik GmbH
   "^utoo,.*":
--
2.51.0

[PATCH v2 2/3] dt-bindings: interrupt-controller: add UltraRISC DP1000 PLIC

[Lucas Zampieri]

From: Charles Mirabile <cmirabil@redhat.com>

Add a new compatible string for UltraRISC DP1000 PLIC.

Signed-off-by: Charles Mirabile <cmirabil@redhat.com>
Signed-off-by: Lucas Zampieri <lzampier@redhat.com>
---
 .../bindings/interrupt-controller/sifive,plic-1.0.0.yaml        | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
index 5b827bc24301..a419de50f5a8 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
@@ -74,6 +74,8 @@ properties:
               - sophgo,sg2044-plic
               - thead,th1520-plic
           - const: thead,c900-plic
+      - items:
+          - const: ultrarisc,dp1000-plic
+          - const: ultrarisc,cp100-plic
       - items:
           - const: sifive,plic-1.0.0
           - const: riscv,plic0
--
2.51.0

Re: [PATCH v2 2/3] dt-bindings: interrupt-controller: add UltraRISC DP1000 PLIC

[Conor Dooley]

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On Mon, Oct 13, 2025 at 12:15:37PM +0100, Lucas Zampieri wrote:
> From: Charles Mirabile <cmirabil@redhat.com>
> 
> Add a new compatible string for UltraRISC DP1000 PLIC.
> 
> Signed-off-by: Charles Mirabile <cmirabil@redhat.com>
> Signed-off-by: Lucas Zampieri <lzampier@redhat.com>
> ---
>  .../bindings/interrupt-controller/sifive,plic-1.0.0.yaml        | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> index 5b827bc24301..a419de50f5a8 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> +++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> @@ -74,6 +74,8 @@ properties:
>                - sophgo,sg2044-plic
>                - thead,th1520-plic
>            - const: thead,c900-plic
> +      - items:
> +          - const: ultrarisc,dp1000-plic
> +          - const: ultrarisc,cp100-plic

Based on your cover letter, this is problem not incorrect, but this fails
the eye test and looks wrong. Please mention in your commit message that
dp1000 is an soc and cp100 is a purchasable IP core.

pw-bot: changes-requested

>        - items:
>            - const: sifive,plic-1.0.0
>            - const: riscv,plic0
> --
> 2.51.0
> 

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