linux-kernel - Re: [PATCH 1/4] dt-bindings: aspeed: Add UART controller

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Date:   Fri, 10 Feb 2023 10:12:31 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chia-Wei Wang <chiawei_wang@...eedtech.com>,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, joel@....id.au, andrew@...id.au,
        jirislaby@...nel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH 1/4] dt-bindings: aspeed: Add UART controller

On 10/02/2023 08:26, Chia-Wei Wang wrote:
> Add dt-bindings for Aspeed UART controller.

Describe the hardware. What's the difference against existing Aspeed
UART used everywhere?

> 
> Signed-off-by: Chia-Wei Wang <chiawei_wang@...eedtech.com>
> ---
>  .../bindings/serial/aspeed,uart.yaml          | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/serial/aspeed,uart.yaml

Filename: aspeed,ast2600-uart.yaml
(unless you are adding here more compatibles, but your const suggests
that it's not going to happen)

> 
> diff --git a/Documentation/devicetree/bindings/serial/aspeed,uart.yaml b/Documentation/devicetree/bindings/serial/aspeed,uart.yaml
> new file mode 100644
> index 000000000000..10c457d6a72e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/aspeed,uart.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serial/aspeed,uart.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Aspeed Universal Asynchronous Receiver/Transmitter

This title matches other Aspeed UARTs, so aren't you duplicating bindings?

> +
> +maintainers:
> +  - Chia-Wei Wang <chiawei_wang@...eedtech.com>
> +
> +allOf:
> +  - $ref: serial.yaml#
> +
> +description: |
> +  The Aspeed UART is based on the basic 8250 UART and compatible
> +  with 16550A, with support for DMA
> +
> +properties:
> +  compatible:
> +    const: aspeed,ast2600-uart
> +
> +  reg:
> +    description: The base address of the UART register bank

Drop description

> +    maxItems: 1
> +
> +  clocks:
> +    description: The clock the baudrate is derived from
> +    maxItems: 1
> +
> +  interrupts:
> +    description: The IRQ number of the device

Drop description

> +    maxItems: 1
> +
> +  dma-mode:
> +    type: boolean
> +    description: Enable DMA

Drop property. DMA is enabled on presence of dmas.

> +
> +  dma-channel:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The channel number to be used in the DMA engine

That's not a correct DMA property. dmas and dma-names
git grep dma -- Documentation/devicetree/bindings/


> +
> +  virtual:
> +    type: boolean
> +    description: Indicate virtual UART

Virtual means not existing in real world? We do not describe in DTS
non-existing devices. Drop entire property.

> +
> +  sirq:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The serial IRQ number on LPC bus interface

Drop entire property.

> +
> +  sirq-polarity:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The serial IRQ polarity on LPC bus interface

Drop entire property.

> +
> +  pinctrl-0: true
> +
> +  pinctrl_names:
> +    const: default


Drop both, you do no not need them.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts
> +
> +unevaluatedProperties: false
> +

Best regards,
Krzysztof