Add support for LS7A LPC IRQ for MIPS Loongson systems

[PATCH 2/8] dt-bindings: interrupt-controller: add LS7A PCH LPC

Posted by Icenowy Zheng 1 week, 2 days ago

Loongson 7A series PCH contains an LPC controller with an interrupt
controller.

Add the device tree binding for the interrupt controller.

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
---
 .../loongson,pch-lpc.yaml                     | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml
new file mode 100644
index 0000000000000..c00fbf31f47f0
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/loongson,pch-lpc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson PCH LPC Controller
+
+maintainers:
+  - Jiaxun Yang <jiaxun.yang@flygoat.com>
+
+description:
+  This interrupt controller is found in the Loongson LS7A family of PCH for
+  accepting interrupts sent by LPC-connected peripherals and signalling PIC
+  via a single interrupt line when interrupts are available.
+
+properties:
+  compatible:
+    const: loongson,pch-lpc-1.0
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 1
+
+  '#interrupt-cells':
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - interrupts
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    lpc: interrupt-controller@10002000 {
+      compatible = "loongson,pch-lpc-1.0";
+      reg = <0x10002000 0x400>;
+      interrupt-controller;
+      #interrupt-cells = <2>;
+      interrupt-parent = <&pic>;
+      interrupts = <19 IRQ_TYPE_LEVEL_HIGH>;
+    };
+...
-- 
2.52.0

Re: [PATCH 2/8] dt-bindings: interrupt-controller: add LS7A PCH LPC

Posted by Rob Herring 2 hours ago

On Sat, Jan 31, 2026 at 05:45:41PM +0800, Icenowy Zheng wrote:
> Loongson 7A series PCH contains an LPC controller with an interrupt
> controller.
> 
> Add the device tree binding for the interrupt controller.
> 
> Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
> ---
>  .../loongson,pch-lpc.yaml                     | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml
> new file mode 100644
> index 0000000000000..c00fbf31f47f0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,pch-lpc.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/loongson,pch-lpc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Loongson PCH LPC Controller
> +
> +maintainers:
> +  - Jiaxun Yang <jiaxun.yang@flygoat.com>
> +
> +description:
> +  This interrupt controller is found in the Loongson LS7A family of PCH for
> +  accepting interrupts sent by LPC-connected peripherals and signalling PIC
> +  via a single interrupt line when interrupts are available.
> +
> +properties:
> +  compatible:
> +    const: loongson,pch-lpc-1.0

Where does 1.0 come from? We don't do version numbers generally unless 
you define where the versions come from (e.g. Soft IP releases for 
FPGAs). I would have expected "ls7a" in the compatible instead.

Rob