[PATCH RFC 05/12] dt-bindings: serial: Add BL808 UART

[Conor Dooley]

On Thu, Oct 29, 2026 at 01:05:46AM -0400, Kwanghoon Son wrote:
> Describe the UART register range, interrupt and baud clock input.
> Initial Linux support targets the BL808 32-byte FIFO and reuses
> Zephyr's bflb,uart compatible. UART3 is D0 PLIC source 20.
> 
> Link: https://docs.zephyrproject.org/latest/build/dts/api/bindings/serial/bflb,uart.html
> 
> Signed-off-by: Kwanghoon Son <asdfkwang at gmail.com>
> ---
>  .../devicetree/bindings/serial/bflb,uart.yaml      | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/bflb,uart.yaml b/Documentation/devicetree/bindings/serial/bflb,uart.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..df29d258f0a1c6d7bb283cf19c4157436991b64b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/bflb,uart.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serial/bflb,uart.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bouffalo Lab UART Controller
> +
> +description: |
> +  UART IP used by Bouffalo Lab SoCs. Initial Linux support covers the
> +  BL808 controller with a 32-byte FIFO. The compatible follows Zephyr.
> +
> +maintainers:
> +  - Kwanghoon Son <asdfkwang at gmail.com>
> +
> +allOf:
> +  - $ref: serial.yaml#
> +
> +properties:
> +  compatible:
> +    const: bflb,uart

This needs to be a device-specific compatible - please just use the
binding already reviewed and agreed upon in Jisheng's 2023 series.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Baud rate generator clock
> +
> +  clock-names:
> +    items:
> +      - const: baud

Drop this clock name, with only one clock there's no more need for it
than the interrupt-names or reg-names that you do not use either.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    uart3: serial at 30002000 {
> +        compatible = "bflb,uart";
> +        reg = <0x30002000 0x1000>;
> +        interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&uart_baud>;
> +        clock-names = "baud";
> +    };
> +...
> 
> -- 
> 2.47.3
> 
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